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Effects of initial texture on deformation behavior during cold rolling and static recrystallization during subsequent annealing of AZ31 alloy

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Journal of Materials Science & Technology 2021年第7期66卷 139-149页

作者： Sang Won Lee Gukin Han Tea-Sung Jun Sung Hyuk Park School of Materials Science and Engineering.Kyungpook National University Daegu 41566Republic of Korea Department of Mechanical Engineering Incheon National UniversityIncheon 22012Republic of Korea

This study demonstrates that the initial texture of Mg alloy significantly affects the microstructure developed during cold rolling and the recrystallization behavior during subsequent annealing. In a sample with a texture oriented toward the normal direction(ND sample), thick and large-sized shear bands are intensively formed during cold rolling and the deformation is strongly localized along these bands. In contrast,in a sample with a texture oriented toward the transverse direction(TD sample), many {10-12} twins are formed at the early stage of cold rolling, and then, numerous small-sized shear bands are formed in these twins. Results of nanoindentation tests reveal that the cold-rolled ND sample has internal strain energy that is substantially concentrated along the shear bands, whereas the cold-rolled TD sample has a large amount of internal strain energy that is homogeneously distributed throughout the material;this latter behavior is strongly related to the extensive {10-12} twinning and the resultant microstructural variations in the TD sample. During subsequent annealing, recrystallization occurs locally along the shear bands in the ND sample, which leads to the formation of a bimodal grain structure comprising fine recrystallized grains and coarse unrecrystallized grains. In contrast, during subsequent annealing of the TD sample, static recrystallization occurs homogeneously throughout the material, which results in the formation of a uniform grain structure that mostly comprises equiaxed recrystallized grains.

关键词： Magnesium alloy cold rolling Initial texture Twinning Static recrystallization

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Influence of lateral displacement on strip shape during cold rolling

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Journal of Iron and Steel Research International 2018年第9期25卷 892-900页

作者： Zhong-kai Ren Hong Xiao Hong-biao Xie Xiao Liu College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004 Hebei China National Engineering Research Center for Equipment and Technology of cold Strip rolling Yanshan UniversityQinhuangdao 066004 Hebei China College of Mechanical Engineering Taiyuan University of Technology Taiyuan 030024 Shanxi China

The theory of metal plastic deformation is an important part of the strip shape control theories. In order to control the shape and gauge accurately during cold thin strip rolling, the mechanism of the metal lateral flow must be revealed clearly. Therefore, the lateral displacement of thin strip was studied by the grid method. Those grids with a line thickness of 10 μm and clear boundaries were successfully manufactured on the strip surface using lithography. Then, the effects of reduction, front and back tension, and taper angle of the first intermediate roll on the metal lateral flow were studied. The strip shape was calculated with and without considering the lateral displacement; furthermore, the calculations were compared with the measured results. The results show that the calculations with considering the lateral displacement are closer to the measured results. In addition, the comparison of finite element analysis results with the experimental results indicates that the test method was reliable.

关键词： Thin strip Lithography technology Lateral displacement Strip shape Experimental research Finite element simulation cold rolling

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Roll gap prediction in acceleration and deceleration process of cold rolling based on a data-driven method

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Journal of Iron and Steel Research International 2023年第5期30卷 1013-1021页

作者： Yun-jian Hu Jie Sun Huai-tao Shi Qing-long Wang Jian-zhao Cao School of Mechanical Engineering Shenyang Jianzhu UniversityShenyang 110168LiaoningChina The State Key Laboratory of rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina Department of Mechanical Engineering North China Electric Power UniversityBaoding 071003HebeiChina

Severe fluctuation of the effective roll gap in the acceleration and deceleration section of the cold rolling process is a significant factor causing thickness ***,the conventional roll gap compensation method and control strategy do not meet the stringent strip quality *** roll gap model in the acceleration and deceleration process is studied to increase the thickness control *** order to improve model accuracy,a roll gap prediction method based on data-driven is *** the complexities of the cold rolling process,the extreme gradient boosting(XGBoost)method is used to predict the roll gap model as the rolling speed ***,support vector regression and neural network-based methods are taken to evaluate and compare the prediction *** on the field data,the simulation experiments are carried *** demonstrated that the prediction performance of the proposed method outperformed the other two *** values of root mean square error,determination coefficient value,mean absolute percentage error and mean absolute error obtained from the XGBoost model were equal to 0.000346,0.952,7.02,and 0.00028,*** addition,the proposed method analyzed the contribution rates of the rolling affecting parameters on the roll *** data showed that in the controllable rolling parameters,the rolling speed is the most impacting factor that disturbs the roll gap model in the acceleration and deceleration process,which can provide a useful direction for actual roll gap adjustment.

关键词： cold rolling Acceleration Deceleration Roll gap model Extreme gradient boosting Contribution rate Analysis

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Experimental Study and Finite Element Polycrystal Model Simulation of the cold rolling Textures in a Powder Metallurgy Processed Pure Aluminum Plate

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Journal of Materials Science & Technology 2005年第2期21卷 148-154页

作者： LiqingCHEN NaoyukiKanetake InstituteofMetalResearch ChineseAcademyofSciencesShenyang110016China//DepartmentofMaterialsProcessingEngineeringSchoolofEngineeringNagoyaUniversityFuro-choChikusa-kuNagoya464-8603Japan DepartmentofMaterialsProcessingEngineering SchoolofEngineeringNagoyaUniversityFuro-choChikusa-kuNagoya464-8603Japan

Ingot metallurgy (IM) aluminum has long been the subject and attracted the attention of many metallurgists and textural researchers of materials. Due to the introduction of large amounts of ex situ interfaces, however, the textures in powder metallurgy (PM) processed aluminum has been rarely reported. In this article, a pure aluminum plate was prepared via PM route. The starting billet was first produced with uni-axially cold compaction and flat hot-extrusion and then followed by cold rolling processes. The hot-extruded and cold rolling deformation textures of the pure PM aluminum at 50%, 80% and 90% cold rolling reductions were studied by orientation distribution functions (ODFs) analysis. The finite element polycrystal model (FEPM) was finally utilized to simulate the cold rolling textural evolution at various stages of cold rolling. In FEPM simulation, the initial hot-extruded textures were taken into account as inputs. The results showed that typical β-fiber texture formed in pure PM aluminum with the cold rolling reduction increased till 80%, and there was not much change after excessive cold rolling deformation. Homogeneous slip is not the only deformation mode in PM processed pure aluminum plate at over 80% cold rolling reduction. The experimental results were qualitatively in good agreement with the simulated ones.

关键词： Texture cold rolling Aluminium Finite element polycrystal model (FEPM) Powder metallurgy

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Evolution of microstructure and texture during cold rolling and high-temperature annealing in Ni-5 at% W substrate for coated conductor

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Rare Metals 2020年第8期39卷 928-935页

作者： Xing-Pin Chen Dan Chen Hong-Fu Sun Li-Xia Wang Du Shang College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

The evolution of microstructure and texture at four strain levels was investigated in Ni-5 at%W alloy by means of electron backscatter diffraction(EBSD)*** deformation microstructure evolves gradually from microbands(MBs)to typical lamellar structures with strain increasing in cold-rolled materials,while only lamellar structures in heavily cold-rolled ***,quantitative analysis of microstructure and texture was *** indicates that the texture is a typical pure metal deformation texture,but a few cube and rolling direction(RD)-rotated cube orientations also can be observed in the deformed *** use of high-temperature annealing enables an area fraction of cube orientation>95%to be obtained for high strained *** addition,it is worth noting that the point-to-point misorientation inside the band with various orientations is found to keep quite *** the point-to-origin misorientation over the same distance is dependent on strain and orientation type in the *** cube-oriented regions were characterized by a high accumulated orientation gradient,close to 28°,compared to the non-cube-oriented *** means that the accumulated orientation gradient only occurs in the cube band with the reduction of 98%,which partly explains the formation of strong cube texture after high-temperature annealing.

关键词： cold rolling Microstructure Texture Orientation relationship

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Data-based flatness prediction and optimization in tandem cold rolling

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Journal of Iron and Steel Research International 2021年第5期28卷 563-573页

作者： Jie Sun Peng-fei Shan Zhen Wei Yao-hui Hu Qing-long Wang Wen Peng Dian-hua Zhang State Key Laboratory of rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina Department of Mechanical Engineering North China Electric Power UniversityBaoding 071003HebeiChina

In cold rolling process,the flatness actuator efficiency is the basis of the flatness control *** precision of flatness is determined by the setpoints of flatness *** the presence of modeling uncertainties and unmodeled nonlinearities in rolling process,it is difficult to obtain efficiency factors and setpoints of flatness actuators *** on the production data,a method to obtain the flatness actuator efficiency by using partial least square(PLS)combined with orthogonal signal correction(OSC)was *** with the experiential method and principal component analysis method,the OSC-PLS method shows superior performance in obtaining the flatness actuator efficiency factors at the last ***,kernel partial least square combined with artificial neural network(KPLS-ANN)was proposed to predict the flatness values and optimize the setpoints of flatness *** with KPLS or ANN,KPLS-ANN shows the best predictive *** root mean square error,mean absolute error and mean absolute percentage error are 0.51 IU,0.34 IU and 0.09,*** the setpoints of flatness actuators are optimized,KPLS-ANN shows better optimization *** result in an average flatness standard deviation is 2.22 IU,while the unoptimized value is 4.10 IU.

关键词： cold rolling Flatness actuator efficiency Data-driven prediction Partial least square Flatness control optimization

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Relating Initial Texture to Deformation Behavior During cold rolling and Static Recrystallization Upon Subsequent Annealing of an Extruded WE43 Alloy

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Acta Metallurgica Sinica(English Letters) 2022年第11期35卷 1793-1811页

作者： Qinghang Wang Haowei Zhai Hongbo Xia Lintao Liu Junjie He Dabiao Xia Hong Yang Bin Jiang School of Mechanical Engineering Yangzhou UniversityYangzhou 225127China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China School of Materials and Energy Yunnan UniversityKunming 650599China The Center of New Energy Materials and Manufacturing Jihua LaboratoryFoshan 528000China

Deformation behaviors during cold rolling and static recrystallization behaviors upon subsequent annealing of an extruded WE43 alloys with different initial textures were investigated in this *** types of differently textured WE43 initial alloys were labeled as samplesⅠ,ⅡandⅢ.The results showed that multiple twinning modes and basal slip dominated the deformation of samples during cold ***-rolled sampleⅠactivated the larger number of double twins with high strain energy,accompanied by the more uniform strain distribution,than cold-rolled samplesⅡandⅢ.During subsequent annealing,recrystallized grains preferentially occurred in double twins,twin-twin intersections and grain boundaries,thereby making cold-rolled sampleⅠhave the more rapid recrystallization *** recrystallization textures formed in three types of cold-rolled samples at the recrystallization nucleation stage,and they never largely changed with the annealing time due to the uniform grain growth induced by the solute drag and the precipitation pinning at grain *** full recrystallization,the grain growth was controlled by the solute drag,instead of precipitates which were re-dissolved into the ***,the nucleation and growth kinetics of static recrystallization were calculated,and the effects of initial texture on activation energies of recrystallization nucleation and growth were discussed.

关键词： WE43 alloy Texture cold rolling Annealing Static recrystallization

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Texture evolution of commercial pure Ti during cold rolling and recrystallization annealing

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International Journal of Minerals,Metallurgy and Materials 2012年第6期19卷 530-535页

作者： Hai-tao Jiang Ji-xiong Liu Zhen-li Mi Ai-min Zhao Yan-jun Bi Metallurgical Engineering Research Institute University of Science and Technology Beijing Beijing 100083 China

X-ray diffraction （XRD） was employed to analyze the texture evolution of commercial pure （CP） Ti during cold rolling and re- crystallization annealing. The texture components were measured by electron backscattered diffraction （EBSD） after recrystallization an- nealing. The CP Ti tends to form a texture with the basal pole tilted 30°-40° away from the normal direction toward the transverse direction. The texture of the initial hot-rolled plate can be classified into three kinds, i.e., the pyramid texture （1013）[5230] and （2021）[1015], the basal plane texture （0001）[2110], and the stronger_prism_texture （1120）[0001]. After cold rolling and annealing （700℃,60 min）,_the main texture components are the cold-rolled texture （1125）[1123] and the recrystallized texture （1013）[5230]. The texture （2021）[1015] is in- herited from the texture of the initial hot-rolled plate with the decrease of orientation density gradually. The volume contents of the cold-rolled texture {2115}（0110） and the recrystallized texture {1013}（1210） are calculated by EBSD. After recrystallization annealing, the specimen is rich in the recrystallized texture and inherits some of texture components from the cold-rolled texture. When the annealing time is prolonged, the anisotropic value decreases.

关键词： titanium cold rolling recrystallization annealing textures

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High-temperature oxidation behavior of modified 4Al alumina-forming austenitic steel: Effect of cold rolling

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Journal of Materials Science & Technology 2021年第9期68卷 91-102页

作者： Qiuzhi Gao Ziyun Liu Huijun Li Hailian Zhang Chenchen Jiang Aimin Hao Fu Qu Xiaoping Lin School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China School of Materials Science&Engineering Tianjin UniversityTianjin 300354China Daotian High Technology Co. Ltd.Qinhuangdao 066004.China

The oxidation behavior and mechanism of as-received and 30 % cold-rolled alumina-forming austenitic(AFA) steel were investigated in dry air at 700℃.The results show that the mass gain per unit area curves of as-received and 30 % cold-rolled steels subject to near-parabolic law before 100 h oxidation *** samples both show higher high-temperature oxidation resistance due to the formation of dense Al_(2)O_(3) oxide *** spallation of outer scale results in the formation of continuous and dense alumina *** can act as short-circuit diffusion channel for the diffusion of Al from alloy matrix to surface,and also provide nucleation sites for B2-NiAl phase,which ensure the continuous formation of Al_(2)O_(3) scale.

关键词： Alumina-forming austenitic steel High-temperature oxidation cold rolling Oxidation mechanism

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Microstructure and texture evolution in commercial-purity Zr 702 during cold rolling and annealing

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International Journal of Minerals,Metallurgy and Materials 2014年第8期21卷 785-795页

作者： Min Ma Ming-he Li Yuan-biao Tan Hui Yuan Wen-chang Liu Key Laboratory of Metastable Materials Science and Technology College of Materials Science and Engineering Yanshan University

Microstructure and texture evolution in commercial-purity Zr 702 during cold rolling and annealing was investigated by optical microscopy, transmission electron microscopy, and X-ray diffraction. The results showed that crystallographic slip was the predominant deformation mechanism in the early stage of deformation. Deformation twins started to form when the rolling reduction was larger than 38.9%; both the dislocation density and the number of twins increased with increasing rolling reduction. The initial texture of the Zr 702 plate consisted of the basal fiber component. During cold rolling the strength of the basal fiber first decreased and then increased with increasing rolling reduction. The cold-rolled sheets were fully recrystallized after being annealed at 550℃. The recrystallization temperature and the size of recrystallized grains decreased with increasing rolling reduction. A larger rolling reduction resulted in a higher grain growth rate when the annealing temperature increased from 550℃ to 700℃. The recrystallization texture was characterized by a major basal fiber and a minor {0113}〈2110〉 component. The strength of the recrystallization texture increased with increasing rolling reduction.

关键词： zirconium cold rolling annealing microstrucmre texture recrystallization

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