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Interface nanocrystalline reinforcement mechanism of particle interlayer in pulsed current assisted rolling Mg/Al laminate 认领 引用 被引量：1
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作者 Peng Li Xiaobao Ma +3 位作者 Yongheng Peng Zhongkai Ren Peng Chen Tao Wang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第3期464-482,共19页
Interface transition zone and the interface influence zone are critical factors in determining the interfacial bonding strength and ductility of heterogeneous metallic laminates.In this study,an innovative process—“... Interface transition zone and the interface influence zone are critical factors in determining the interfacial bonding strength and ductility of heterogeneous metallic laminates.In this study,an innovative process—“cold spraying+pulsed current rolling”—is proposed for fabricating Mg/Al laminates,significantly enhancing both interface strength and ductility.Notably,the average interface shear strength achieved is three times that of conventional hot rolling,reaching 70.7 MPa,while the interface shear strain increases from 3.4%to 28%.The high-velocity impact of cold-sprayed aluminum particles on Mg and Al substrates forms a three-dimensional interface,effectively expanding the interfacial bonding area and refining the interfacial microstructure.The fine-grained coating structure produced by cold spraying acts as a primer,facilitating the formation of a nanocrystalline interface during pulsed current assisted rolling.The interface comprises an ultrafine nanocrystalline Al coating with grain sizes around 30 nm andβ-phase nanotwins approximately 300 nm in scale,significantly enhancing the interfacial bonding strength.Together with the Mg and Al substrates,the nanocrystalline transition layer forms a layered gradient transitional structure that evolves into a 50-μm-wide interface-affected zone during deformation.This unique feature promotes strain delocalization,effectively mitigates strain concentration at the interface,and improves its fracture toughness.Additionally,the nanocrystalline interface increases the grain boundary area,promoting atomic diffusion and strengthening metallurgical bonding both between the coating and the substrate and within the coating itself.The“cold spraying+pulsed current rolling”process offers a straightforward approach to fabricating laminated nanostructured transition layers,demonstrating great potential in the interfacial design of heterogeneous materials. 展开更多
关键词 Nanocrystalline transition layer Pulsed current assisted rolling Cold spraying Magnesium/aluminium laminates Strain delocalization
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Prediction model of rolling force in cold tandem rolling based on dynamic deformation zone coupling and DE-PSO hybrid optimization 认领 引用
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作者 Ji Zhang Zhi-Xuan Wang +1 位作者 Qi Lu Zhen-Hua Bai 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第7期33-48,共16页
To enhance the prediction accuracy of rolling force in cold tandem rolling processes,a deformation resistance-rolling force(DR-RF)coupled model is proposed based on dynamic deformation zone length iteration.This DR-RF... To enhance the prediction accuracy of rolling force in cold tandem rolling processes,a deformation resistance-rolling force(DR-RF)coupled model is proposed based on dynamic deformation zone length iteration.This DR-RF model comprehensively accounts for the influence of material parameters,hot rolling,and cold rolling processes on deformation resistance,establishing a robust framework for cold rolling.To ensure the model's generalization capability across diverse stands and steel grades,a hierarchical progressive optimization strategy is introduced,leveraging a differential evolution-particle swarm optimization(DE-PSO)hybrid algorithm to effectively mitigate local optima.Experimental validation using industrial data demonstrates significant performance improvements.The unoptimized DR-RF model already exhibits superior accuracy compared to the conventional Hill model.Furthermore,DE-PSO model optimized DR-RF model achieves an overall rolling force prediction accuracy of 94.71%,representing a 7.11%improvement over Hill model.Notably,the first stand shows a 13.4%improvement in accuracy,and the third stand achieves the highest accuracy of 96.68%.The average prediction accuracy for 15 steel grades consistently remains within the range of 90.5%-97.2%.DR-RF model coupled with DE-PSO framework provides a robust theoretical foundation and practical solution for steel enterprises to achieve efficient and intelligent rolling across multiple stands and steel grades. 展开更多
关键词 Cold tandem rolling Rolling force prediction Model coupling DE-PSO algorithm Dynamic deformation zone length
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Effect of rolling temperature on microstructure and mechanical properties of Ni-W-Co-Ta alloy 认领 引用
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作者 Jin-jin TANG Yi XIONG +4 位作者 Yong LI Xiao-qin ZHA Xiu-ju DU Hua-fei LI Feng-zhang REN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第3期887-901,共15页
The effect of warm rolling temperature(500-900℃)on the microstructure and mechanical properties was investigated for a Ni-W-Co-Ta alloy to achieve excellent strength-plasticity synergy.The results showed that the all... The effect of warm rolling temperature(500-900℃)on the microstructure and mechanical properties was investigated for a Ni-W-Co-Ta alloy to achieve excellent strength-plasticity synergy.The results showed that the alloy exhibited high-density dislocations and deformation bands when rolled below 750℃.The nano-Ni4W phase precipitated when rolled at 700-900℃,with the higher deformation temperature,the amount and size of precipitates increased.At 900℃,dissolution of the precipitated Ni4W and dynamic recrystallization of the matrix occurred.Consequently,the strength and hardness firstly decreased,then increased,and decreased again as the deformation temperature increased.An excellent strength-plasticity synergy was achieved through the combined effects of precipitation strengthening and deformation twins strengthening of Ni4W:with a tensile strength of 2010 MPa,a yield strength of 1839 MPa,a microhardness of HV 587,and an elongation of 13.2%when the alloy was warm-rolled at 750℃. 展开更多
关键词 Ni-W-Co-Ta alloy warm rolling microstructure mechanical properties
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Effects of multi-directional forging combined with hot rolling on microstructure and mechanical properties of 7050 aluminum alloy 认领 引用
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作者 Xiao-fen TAN Hao-wei HUANG +3 位作者 Ze-kun LIAO Wen-bin ZHANG Xiao-peng LIANG Hui-zhong LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第7期1988-2004,共17页
Multi-directional forging at 450°C combined with rolling at 300°C and 470°C was applied to a 7050 aluminum alloy prior to heat treatment.The effects of rolling temperature on the microstructure of the a... Multi-directional forging at 450°C combined with rolling at 300°C and 470°C was applied to a 7050 aluminum alloy prior to heat treatment.The effects of rolling temperature on the microstructure of the alloy were analyzed using optical microscopy,X-ray diffraction,scanning electron microscopy,electron backscatter diffraction and transmission electron microscopy.After solution treatment,the average grain size of the alloy measured from high-angle grain boundaries was approximately 20μm,compared to 100μm before forging.After artificial aging,the yield strength,ultimate tensile strength and elongation after fracture of the samples rolled at 300°C were(609.9±5.5)MPa,(662.4±1.7)MPa and(18.5±1.2)%,respectively.In the case where the alloy was rolled at 470°C,the corresponding values were(592.7±4.2)MPa,(641.0±3.9)MPa and(18.7±0.9)%,respectively. 展开更多
关键词 7050 aluminum alloy multi-directional forging rolling microstructure mechanical properties
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Analytical model of force and deformation parameters in TRB upward-rolling 认领 引用
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作者 Yuan-Ming Liu Xiang Cheng +5 位作者 Yi-Zhong Cao Shuang-Chi Li Ya-Xing Liu Yu Huang Rong-Sheng Sun Dong-Ping He 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第6期364-379,共16页
Tailor-rolled blanks(TRBs)are strips characterized by a continuously varying thickness along their length,providing advantages such as reduced weight,enhanced strength,and superior surface quality.TRB upward-rolling i... Tailor-rolled blanks(TRBs)are strips characterized by a continuously varying thickness along their length,providing advantages such as reduced weight,enhanced strength,and superior surface quality.TRB upward-rolling is a dynamic rolling technique in which the rollers exhibit vertical velocity during the rolling.This technique involves significant elastic deformation in both the rolls and the workpiece,complicating the investigation of upward-rolling force and the changes in deformation parameters within the mechanism.The mathematical models are developed to represent the rolling force and deformation parameters,taking into account the unique aspects of TRB upward-rolling.Finite element simulation and a backpropagation neural network are employed to establish the force arm coefficient model for TRB upward-rolling.Based on this model,the metal flow velocity field that satisfies the motion constraints of the deformation area is proposed,considering the specific characteristics of the deformation area.The force required for plastic deformation during rolling is determined by evaluating the power of each component and correlating the force arm coefficient with the rolling torque.By leveraging the coupled iterative relationship between rolling force and roller flattening radius,a model for analyzing rolling force in upward-rolling is developed.A comparison between the model’s calculated values and experimental data demonstrates a high degree of accuracy.Furthermore,the effects of the inclination angle of the transition area,friction factor,and workpiece tension on the force and deformation parameters are researched,elucidating the underlying mechanisms of force and deformation parameter variations in the upward-rolling. 展开更多
关键词 Upward-rolling Rolling force Forward slip Energy method Force arm coefficient
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Performance degradation and maintenance optimization strategy of rolling bearings based on data fusion and adaptive partition 认领 引用
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作者 Hong-Chuan Cheng Xin-Hai Li +3 位作者 Guo-Hui Ma Yu Cui Zhi-Wu Shang Xia-Fei Shi 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第2期178-194,共17页
The traditional method of performance degradation prediction and maintenance of rolling bearings only considers a single sensor signal,which makes it difficult to automatically partition degradation stages and prone t... The traditional method of performance degradation prediction and maintenance of rolling bearings only considers a single sensor signal,which makes it difficult to automatically partition degradation stages and prone to over-detection.A new method of performance degradation evaluation and maintenance of rolling bearings based on data-level fusion,adaptive health state partitioning,and state maintenance is proposed.Firstly,considering the degradation and impact in the process of bearing deterioration,the multi-sensor signals are dynamically weighted to achieve data-level fusion.Secondly,a bearing health index was established based on fast spectral correlation,Wasserstein distance,and linear rectification techniques.On this basis,by combining the Bayesian information criterion and the elbow rule,the precise division of rolling bearing health state is realized through hidden Markov model regression.Then,random forest was used to classify and predict the data to verify the validity of the proposed data fusion method and health indicator.Finally,condition-based maintenance strategy based on the fourth moment,stress-strength interference model,and Gamma process is proposed to avoid excessive detection and reduce maintenance costs.Through accelerated degradation experiments and field validation tests on the rolling bearing test data set of Xi’an Jiaotong University and FEMTO(PRONOSTIA),the accuracy and superiority of the proposed method in the prediction and maintenance of bearing health state are verified. 展开更多
关键词 Rolling bearing Data fusion Gamma process Adaptive partition Maintenance strategy
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Machine learning assisted adaptable rolling for high strength steel 认领 引用
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作者 Guang-Ming Cao Yu-Ting He +6 位作者 Hong-Bing Wang Si-Wei Wu Qi-Ming Jiang Cheng-De Zhang Zhi-Wei Gao Ning Liu Zhen-Yu Liu 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第6期350-363,共14页
The model-based correlation between the chemical composition,process parameters,and mechanical property of the steel lies at the heart of the design of rolling process optimization.Yet,the hot rolling process is chara... The model-based correlation between the chemical composition,process parameters,and mechanical property of the steel lies at the heart of the design of rolling process optimization.Yet,the hot rolling process is characterized by tightly coupling,many variables,and nonlinearity.The complicated link between the chemical composition,process factors,and mechanical properties of the high strength steel makes it difficult to construct a mathematical equation.On the basis of industry data for hot rolling,thermodynamic methods were applied to compute the effective Ti concentration here.Random forest was used to create the corresponding relationship model of the chemical composition,process parameters,and mechanical property for the high strength steel,obtaining a high level of mechanical property prediction precision.The root mean squared error for predicting yield strength is 21.07 MPa,for predicting tensile strength it is 19.12 MPa,and for predicting elongation it is 2.18%.Using the same chemical composition billet in conjunction with multi-objective evolutionary algorithm based on decomposition algorithm algorithm and taking into account the limits of the process circumstances,the best designs for the hot rolling process of different strength level steels are accomplished.The viability of process optimization is determined by industrial tests and theoretical analysis of the strength increment. 展开更多
关键词 Random forest Multi-objective optimization High strength steel Process optimization Hot rolling
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Physics-informed machine learning with residual learning for width spread prediction and diagnostics in hot rolling steel industry 认领 引用
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作者 Jing-Dong Li Xiao-Chen Wang +3 位作者 Hai-Yu Wang Li-Jie Dong Jian Shao Quan Yang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第7期332-353,共22页
Width spread is a critical quality indicator in the hot strip rolling(HSR)manufacturing process.To improve prediction accuracy,a physics-informed machine learning framework with residual learning(PI-MLRL)is proposed,i... Width spread is a critical quality indicator in the hot strip rolling(HSR)manufacturing process.To improve prediction accuracy,a physics-informed machine learning framework with residual learning(PI-MLRL)is proposed,in which a mechanism model,a light gradient boosting machine(LightGBM)-based residual learning module,and a physics-constrained distillation mechanism are integrated.By combining physical consistency with nonlinear fitting capability,an accurate mapping between process variables and width spread is achieved.Experimental results show that the proposed framework outperforms the mechanism model and seven representative data-driven models in terms of mean absolute error,root-mean-square error,and coefficient of determination.Moreover,Shapley additive explanations(SHAP)method is employed for interpretable diagnostics of PI-MLRL predictions,clarifying the effects of key variables on width spread under different operating conditions.Finally,the proposed framework was deployed on a 2160-mm HSR production line,and application results showed that the width spread prediction error was maintained within±3 mm,thereby confirming its engineering applicability. 展开更多
关键词 Hot strip rolling Width spread prediction Physics-informed machine learning Residual learning Interpretable diagnostics
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Microstructure and tribological behavior of gradient nanostructured Inconel 625 alloy treated via plate surface mechanical rolling 认领 引用
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作者 Yan-jiang WANG Zhi JIA +4 位作者 Jin-jin JI Luen-chow CHAN Chi-ping LAI Xian-zheng LU De-xue LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第4期1166-1182,共17页
The effects of plate surface mechanical rolling treatment(P-SMRT)on the microstructure and tribological behavior of Inconel 625 alloy were investigated.The results reveal that P-SMRT induced the formation of a gradien... The effects of plate surface mechanical rolling treatment(P-SMRT)on the microstructure and tribological behavior of Inconel 625 alloy were investigated.The results reveal that P-SMRT induced the formation of a gradient nanostructure(GNS)strengthening layer with a thickness of 700μm on the surface of Inconel 625 alloy.The GNS formation was driven by the interaction between deformation twins and dislocations,leading to the development of shear bands that transformed into ultrafine grains and nanograins.The hardness of the samples with GNS was 192.7%higher than that of the untreated samples.In addition,the tribological properties of the P-SMRT and untreated samples were investigated through dry sliding friction and wear tests.These findings indicate that the P-SMRT induced GNS accommodated greater strain,reduced strain localization,and inhibited surface material exfoliation and transfer,thereby significantly enhancing the wear resistance of Inconel 625 alloy. 展开更多
关键词 plate surface mechanical rolling treatment gradient nanostructures deformation twins tribological behavior Inconel 625 alloy
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Texture traits and mechanical anisotropy of AZ31 magnesium alloy sheet by hard plate cross rolling 认领 引用
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作者 Jia Yang Zhang Feng Li +2 位作者 Lu Sun Wen Tao Niu Mu Zi Cao 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第1期550-564,共15页
Conventional cross rolling is influenced by the force couple effect of symmetrical rollers,resulting in the c-axis of the plate grains being oriented perpendicular to the rolling surface.This orientation contributes t... Conventional cross rolling is influenced by the force couple effect of symmetrical rollers,resulting in the c-axis of the plate grains being oriented perpendicular to the rolling surface.This orientation contributes to a high degree of work hardening and mechanical anisotropy,thereby complicating subsequent processing.In this study,the hard plate cross rolling(HP-CR)process is put forward for the first time,and the microstructure evolution and mechanical properties of rolled AZ31 Magnesium plate were analyzed.The results indicate that,in comparison to traditional cross rolling(CR),the average grain size of the HP-CR is refined to 5.33µm.Additionally,the average yield strength and elongation of the sheet are enhanced by 15.2%and 35.2%,respectively,while the average tensile strength is 283 MPa,and the r value decreases by 39.8%.These changes are attributed to the combined effects of grain refinement,microstructural homogenization,and basal texture weakening.On the one hand,the substantial energy stored in the original lattice distortion serves as a driving force for the dynamic recrystallization process,facilitating the elimination of the deformed grain structure.This process increases the proportion of recrystallized grains from 5%to 82%,reduces the degree of work hardening,and correspondingly decreases the density of geometrically necessary dislocations(ρGND)by 70.8%,accompanied by the formation of high-angle grain boundaries(HAGB).On the other hand,dynamic recrystallization promotes grain rearrangement,resulting in an increased number of grains oriented in the transverse direction(TD),which diminishes the texture strength of the basal plane.Concurrently,the activation of non-basal slip systems reduces the resistance to dislocation sliding in various directions,significantly reduces the degree of mechanical anisotropy and enhancing the plastic deformation capacity of the plate.This research provides valuable scientific insights and technical foundations for the large-scale manufacturing of high-performance AZ31 magnesium alloy sheets. 展开更多
关键词 Hard plate cross rolling Magnesium alloy sheet Texture evolution Mechanical anisotropy
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Intelligent Fault Diagnosis of Rolling Bearing With Variable Speed Based on ASTFrFT and Time-Frequency BoTNet Model 认领 引用
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作者 Jie Ma Jun Wei Xinyu Wang 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第7期1761-1763,共3页
Dear Editor,This letter presents an intelligent fault diagnosis method for variable speed rolling bearings based on the adaptive short-time fractional Fourier transform(ASTFrFT)and the time-frequency BoTNet(TFB)to add... Dear Editor,This letter presents an intelligent fault diagnosis method for variable speed rolling bearings based on the adaptive short-time fractional Fourier transform(ASTFrFT)and the time-frequency BoTNet(TFB)to address the challenge of extracting fault characteristics of rolling bearings under variable speed conditions and the poor classification of classical deep learning models.Firstly,to address the limitations of FrFT in time-varying signal processing,the physical mechanism of traditional STFT is extended into the FrFT domain by minimizing fuzzy entropy values to construct the order matrix. 展开更多
关键词 variable speed rolling bearings time frequency botnet rolling bearings deep learning modelsfirstlyto variable speed adaptive short time fractional fourier transform extracting fault characteristics intelligent fault diagnosis
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Mechanism and Mitigation of Local Rolling Contact Fatigue in Metro Wheels 认领 引用
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作者 LIU Yongfeng WANG Xiaohua +2 位作者 ZHOU Mingxue PU Anhui SUN Xiaojuan 《摩擦学学报（中英文）》 EI CAS CSCD 北大核心 2026年第5期834-845,共12页
Shortly after the commencement of service operations,a distinct form of localized rolling contact fatigue(RCF)was identified on the wheels of a metro line.Field investigations revealed that most fatigue damage measure... Shortly after the commencement of service operations,a distinct form of localized rolling contact fatigue(RCF)was identified on the wheels of a metro line.Field investigations revealed that most fatigue damage measured less than 10 cm in length and 1.5 cm in width,accompanied by significant material spalling and flaking.These defects were found to be distributed exclusively around the flange root and the region outside the nominal rolling circle,with approximately 78.6%concentrated at the flange root.Furthermore,trailer wheels exhibited a markedly higher incidence of RCF compared to motor wheels.To elucidate the underlying failure mechanism,a multibody dynamics model of the metro vehicle was established using SIMPACK,with numerical simulations performed based on actual track geometry and operational data.The analysis indicated that the line contained numerous small-radius curves.Lubricators installed along the high rail in these curves contaminated the rail surface,leading to a significant reduction in the adhesion coefficient on that side.When trains were braked while negotiating curves-particularly at stations located on such curves-the resulting low-adhesion conditions induced localized RCF on the wheels on the high-rail side.Additionally,the decreased adhesion on the high-rail side caused increased tread wear on the wheels of the low-rail side,which further promoted fatigue damage initiation at the flange root.The higher incidence of RCF on trailer wheels was attributed to two primary factors.First,as the leading wheelset,the trailer wheels were the first to contact the oil-contaminated rail,thereby experiencing the most severe adhesion degradation.Second,motor wheels generally exhibited higher tread wear rates,which helped to remove incipient surface cracks before they could develop into macroscopic RCF damage.By implementing a regimen of regular cleaning to remove oil contamination from both rail surfaces and wheel flanges,the wheel-rail adhesion conditions were substantially improved.This intervention effectively suppressed the occurrence of the localized rolling contact fatigue problem. 展开更多
关键词 metro local rolling contact fatigue field investigation low adhesion dynamics simulation
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Seismic performance of a new type of sliding-rolling friction composite isolation bearing 认领 引用
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作者 Liu Bo Pan Danguang +2 位作者 Song Congbo Liu Linlin Ni Guowei 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2026年第1期171-185,共15页
Isolation technology can reduce the type of structural damage that earthquakes cause.A new type of composite sliding-rolling friction composite seismic isolation bearing(SRF)with composite sliding friction and rolling... Isolation technology can reduce the type of structural damage that earthquakes cause.A new type of composite sliding-rolling friction composite seismic isolation bearing(SRF)with composite sliding friction and rolling friction is proposed.SRF is capable of realizing a parallel arrangement of sliding friction and rolling friction,and the coefficient of dynamic friction shows variability.The proposed static tests on composite bearings were conducted to investigate the effects of the number of shims,loading speed and vertical pressure on the dynamic friction factor.Test results show that the coefficient of dynamic friction first generally decreases and then increases with an increase in sliding speed,prior to again decreasing with an increase in vertical pressure.The dynamic friction factor increases and then decreases with an increase in the number of shims for a four-roll ball.It decreases and then increases with an increase in the number of shims for a five-roll ball.Based on finite element analysis,modeling and analyzing the effects of the coefficient of friction,the number of balls and the number of shims on the hysteresis performance of the support and derive its skeleton curve.The SRF hysteretic performance,dynamic friction factor and the number of rolling balls and shims show significant correlation. 展开更多
关键词 sliding friction rolling friction isolation bearing friction coefficient hysteresis performance
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Unraveling surface microtexture evolution mechanism of austenitic stainless steel thin strip during asymmetric rolling by crystal plasticity modeling 认领 引用
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作者 Xiao-Guang Ma Chang Yan +5 位作者 Jun-Jie Lian Wei-Dong Zhao Zhi-Hua Wang Zheng-Yi Jiang Xi Liao Jing-Wei Zhao 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第7期191-213,共23页
The numerical simulation and experimental investigation on the surface microtexture evolution of austenitic stainless steel(ASS)thin strip during asymmetric rolling(ASR)process are involved.The crystal plasticity fini... The numerical simulation and experimental investigation on the surface microtexture evolution of austenitic stainless steel(ASS)thin strip during asymmetric rolling(ASR)process are involved.The crystal plasticity finite element method was employed to evaluate the deformation behavior of ASS thin strip during ASR,and also,the deformation behavior of ASS thin strip during symmetric rolling was comparatively studied,with a purpose of unraveling the surface microtexture evolution mechanism during ASR.Both numerical and experimental results demonstrate an increase in the surface roughness of strip surface in contacting with the roll of fast side,along with the increase in the differential speed ratio during ASR.A comprehensive analysis on ASR mechanism is performed,revealing that the equivalent strain rate increases in conjunction with the increase in the differential speed ratio,resulting in uneven plastic deformation of grains and the formation of undulated surface microtexture,which ultimately compromise the surface quality.In addition,ASR introduces remarkable shear force on the workpiece,thereby promoting the formation of{112}and{111}oriented grains.The effects of{112}and{111}components on the slip and deformation behavior are discussed,and the results show that{112}orientation is detrimental to the surface roughness of ASS thin strip during ASR,whereas{111}orientation exerts a negligible influence on the surface roughness of ASS thin strip during ASR. 展开更多
关键词 Asymmetric rolling Austenitic stainless steel Crystal plasticity finite element method Surface roughness Surface microtexture evolution
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Quantification of dynamically inhomogeneous acoustoplastic effect on rolling process of superalloy thin-walled complex-section ring 认领 引用
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作者 Guangda SHAO Hongwei LI +1 位作者 Mei ZHAN Zhiyu XIANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第7期609-620,共12页
Superalloy thin-walled complex-section rings,vital for industrial sealing systems,face challenges of localized wall thinning and section springback during deformation.To address these challenges,this work developed an... Superalloy thin-walled complex-section rings,vital for industrial sealing systems,face challenges of localized wall thinning and section springback during deformation.To address these challenges,this work developed an Ultrasonic Vibration-Assisted(UVA)rolling process,where Ultrasonic Vibration(UV)was applied to ring via feed roller.However,circumferential rotation and structural variation of the ring induce dynamically inhomogeneous acoustoplastic effect,thereby complicating process prediction and control.To this problem,a quantification method comprising three key components was proposed:(ⅰ)an acoustoplastic constitutive model related to Acoustic Energy Density(AED)to describe the ring's mechanical re sponse,(ⅱ)a Gaussian function to model the circumferential AED distribution,(ⅲ)a cyclic coupling calculation framework of ultrasonic and deformation fields to capture the axial AED evolution.Using this method,an UVA rolling finite element model of W-section ring was established to reveal the evolution of AED and its influence on deformation.Radial UV concentrates energy in contact zones,exacerbating localized thinning,while axial UV induces uniform AED,suppressing thinning and springback.A spatiotemporal matching strategy of ultrasonic and deformation fields was finally proposed to improve deformation behavior during rolling forming.This work offers a new approach for high-performance manufacturing of thin-walled complex-section rings. 展开更多
关键词 Dynamically inhomogeneous acoustoplastic effect Finite element method Process control Thin-walled complex-section ring Ultrasonic vibration-assisted rolling
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Investigation on the rolling contact fatigue cracks initiation of subway fixed frogs based on transient dynamics 认领 引用
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作者 Zhaoguang Zheng Zhiguo Dong +3 位作者 Jiayi Hu Jingmang Xu Kai Wang Ping Wang 《Railway Engineering Science》 EI 2026年第2期275-293,共19页
The issue of fatigue damage to rails has become increasingly prominent with the rise in subway traffic and speed.The hazardous space of the turnout frog significantly intensifies the dynamic interaction between the ve... The issue of fatigue damage to rails has become increasingly prominent with the rise in subway traffic and speed.The hazardous space of the turnout frog significantly intensifies the dynamic interaction between the vehicle and the frog rail,leading to more pronounced fatigue damage in the turnout rail.This paper focuses on the No.9 turnout fixed frog commonly used in subway lines.A three-dimensional explicit transient rolling contact finite element model of the fixed frog is established.The dynamic response of wheel-rail rolling contact is analyzed under various speeds and vertical stiffness conditions.Rolling contact fatigue crack locations,angles,and initiation life were investigated.The research indicates that the 30 mm top width cross-section of the nose rail is most susceptible to fatigue cracks,which initiate on the rail surface.The angle between the crack initiation surface and the lateral direction is between 70°and 95°.Higher speeds result in shorter fatigue life,while the vertical stiffness of the fastener has less of an effect.The simulation results align with findings from field surveys.The established model and research conclusions can provide theoretical support for optimizing fixed frog structures and predicting fatigue life. 展开更多
关键词 Fixed frog Rolling contact fatigue Crack initiation Explicit finite element method Vehicle speed Fastener stiffness
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Hot deformation behavior and hot rolling verification of Q 1100 ultra-high-strength steel 认领 引用
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作者 LIU Wen-jian LI Hong-ying +5 位作者 KONG Yao-jie LIANG Liang XIAO Ai-da ZHANG Yong-lin ZENG Wei-min GAO Qing 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第2期567-581,共15页
The evaluation of the hot workability and applying it to hot rolling process are crucial for the optimization of microstructure of steel.In this study,the hot workability of Q 1100 steel was studied by a combination o... The evaluation of the hot workability and applying it to hot rolling process are crucial for the optimization of microstructure of steel.In this study,the hot workability of Q 1100 steel was studied by a combination of hot compression tests,hot rolling application,and microstructure characterization.The results show that the established recrystallization kinetic models can effectively predict stress variation during hot deformation.The calculated DRX volume fraction is positively related to deformation temperature,and negatively related to the strain rate and Zener-Hollomon parameter.Then the relationship between hot working parameters and microstructure evolution was established by drawing the hot processing maps.The hot processing maps were further applied to hot rolling.When the steel is rolled inside the optimum hot processing window,the macroscopic surface of the steel plate is relatively flat,and its microstructure is mainly composed of continuous dynamic recrystallization(CDRX)grains.The orientation difference between CDRX grains and the adjacent grains is small.When the steel is rolled inside the flow instability region,cracks appear on the macroscopic surface,and the microstructure includes deformed grains and discontinuous dynamic recrystallization(DDRX)grains.The DDRX grains have a large orientation difference with adjacent grains. 展开更多
关键词 hot deformation behavior hot processing map hot rolling ultra-high-strength steel continuous dynamic recrystallization discontinuous dynamic recrystallization
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Asymmetric flow in multi-mode continuous casting and rolling mold under electromagnetic braking 认领 引用
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作者 Jing-Pei Shi Xiao-Xian Shang +3 位作者 Xin-Yue Shi Zhan-Long Piao Cai-Jun Zhang Li-Guang Zhu 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第1期159-179,共21页
The flow behavior of molten steel in the thin slab mold under high casting speed conditions was investigated,with a focus on the multi-mode continuous casting and rolling mold.A steel-slag two-phase flow model was est... The flow behavior of molten steel in the thin slab mold under high casting speed conditions was investigated,with a focus on the multi-mode continuous casting and rolling mold.A steel-slag two-phase flow model was established using large eddy simulation,the volume of fluid,and magnetohydrodynamics methods through numerical simulation.The maximum flow velocity and wave height at the steel-slag interface within the mold are critical evaluation criteria for analyzing asymmetric flow under varying casting speeds and electromagnetic braking.The results indicate that the asymmetric flows within the mold do not occur synchronously.The severity of the asymmetric flow correlates with the velocity difference across the steel-slag interface.A greater biased flow prolongs the time required to revert to a steady state.When the magnetic field intensity is set to 0.24 T and the magnetic pole position is at 390 mm from the steel-slag interface,this configuration can reduce the velocity of the steel-slag interface,thereby mitigating the asymmetric flow.Additionally,it can diminish the velocity,impact depth,and impact intensity on the narrow face of the jet,thus improving the distribution of velocity and turbulent kinetic energy within the mold.This configuration prolongs the time required for the steel-slag interface to transition from a stable state to its maximum velocity and shortens the time for the interface to return to stability from an unstable state.Moreover,it ensures the positional stability of the steel-slag interface,confining its position within−3 mm. 展开更多
关键词 Multi-mode continuous casting and rolling mold Asymmetric flow Steel-slag interface Turbulent kinetic energy Electromagnetic braking
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Effect of RE/Zn atomic ratio on the microstructure of Mg-Zn-Gd-Y alloys during rolling process:A new composition design strategy for high-strength and high-thermal-conductivity magnesium alloy 认领 引用 被引量：1
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作者 Xin Li Hailong Shi +7 位作者 Xuejian Li Weimin Gan Chao Xu Chao Ding Sarvar Tursunbaev Nodir Turakhodjaev Xiaoshi Hu Xiaojun Wang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第3期157-175,共19页
The design of high-strength and high-thermal-conductivity magnesium alloy sheets is challenged by the inherent contradiction between strength and thermal conductivity,as well as the complex variables involved in the r... The design of high-strength and high-thermal-conductivity magnesium alloy sheets is challenged by the inherent contradiction between strength and thermal conductivity,as well as the complex variables involved in the rolling process.In this study,Mg-xZn-0.5Gd-0.5Y(at.%)(1/x=0.5,1.0,1.5)alloys were developed by adjusting the atomic ratio of rare earth(RE)elements to Zn.In the subsequent multi-pass hot rolling process,the influence of various factors on the microstructure and comprehensive properties of alloys with different compositions was obtained.With the decrease of RE/Zn atomic ratio,the W phase gradually dominates,which ensures the high thermal conductivity throughout the preparation process.Additionally,the thickness reduction per pass plays a decisive role in the properties of alloys by affecting the precipitates,dislocations and grains.The reheating between passes plays a coordinating role in the whole rolling process through the twin-induced static recrystallization mechanism.The findings indicate that leveraging the advantages of large thickness reduction per pass and effectively coordinating strain accumulation is a viable strategy for progressively enhancing the strength of highthermal-conductivity magnesium alloys,ultimately leading to superior comprehensive performance.This study provides systematic research results for the composition design and process optimization of high-strength and high-thermal-conductivity magnesium alloy rolled sheets,which is helpful to promote the performance breakthrough and application expansion in this field. 展开更多
关键词 Mg-Zn-Gd-Y alloy Composition design Rolling Twin W phase
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Numerical simulation of wheel-rail rolling contact fatigue considering yaw angle and interfacial conditions 认领 引用
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作者 LI Ding-kang WU Bing +2 位作者 WANG Zhao-yang LI Ji-peng ZUO Jian-yong 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第3期1460-1472,共13页
The accuracy of wheel-rail rolling contact force is of great significance for vehicle dynamics simulation.A wheel-rail rolling contact behavior model considering wheelset yaw is proposed.The NORM algorithm is adopted ... The accuracy of wheel-rail rolling contact force is of great significance for vehicle dynamics simulation.A wheel-rail rolling contact behavior model considering wheelset yaw is proposed.The NORM algorithm is adopted to solve the wheel-rail normal contact problem.The extended creep force model(ECF)is used for the tangential contact problem,which considers different interfacial conditions,temperature in the contact area,and the elastoplastic behavior of the third body.A fatigue life prediction framework based on the critical plane method is introduced to evaluate the contact fatigue damage under the coupled influence of yaw angle and interfacial conditions.The effects of wheel yaw angle on the contact pressure and wheel-rail rolling contact fatigue life under dry and wet conditions are investigated.The results show that under both dry and wet conditions,increasing yaw angle leads to an increase in creepage,expansion of the sliding area,enhancement of creep force,and a simultaneous increase in the contact area temperature,thereby causing an increase in the fatigue parameter(FP).The wheel-rail rolling contact life with yaw angle is shortened compared to that without yaw,and the life decay rate under wet condition is slower than that under dry condition. 展开更多
关键词 yaw angle wheel-rail rolling contact elastic-plastic behavior rolling contact fatigue
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