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Journal of Rare Earths 2024年第5期42卷 1001-1008,I0007页

作者： Zhen Zhang Huanhuan Chen Shiju Cao Jinhua Peng Peng Guo Chang Long Shan Wang Chang Chen Yong Wu Ji'an Huang Xiaodong Du Haigen Wei School of Materials Science and Engineering Hefei University of TechnologyHefei230009China NationalLocal Joint Research Center of Non-ferrous Metal Materials and Processing Technology Hefei230009China Laboratory of Nonferrous Metal Material and Processing Engineering of Anhui Province Hefei230009China School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang212003China Institute of Industry and Equipment Technology Hefei University of TechnologyHefei230009China Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou341000China

Hot-extrusion and cold-rolling were conducted on Mg-Ce binary alloys to explore the effect of cerium(Ce)on microstructure,texture and mechanical properties of Mg *** addition of Ce results in significant grain refinement both in as-cast and hot-extruded *** basal texture is also weakened after extrusion and an inclined basal texture is formed with Ce *** strength and elongation of the Mg-Ce alloys are improved simultaneously due to such grain refinement and texture weakening *** cold-rolling,plenty of twins are found in the pure Mg and AZ31 plates while grains in the Mg-0.3Ce plate deform more uniformly without lamellar twin ***,Mg-0.3Ce alloys own strong and continuous strain hardening because Ce atoms and Mg-Ce precipitated phases serve as obstacles for dislocation slip.

关键词： Mg-Ce alloys Hot extrusion cold-rolling Rare earths

Transformation behaviors and superelasticity of Ti_(50)Ni_(48)Fe_2 shape memory alloy subjected to cold-rolling and subsequent annealing

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Rare Metals 2014年第6期33卷 652-656页

作者： Xiao-Bo Yuan Bin Chen Fu-Shun Liu Qing Xu Wen Ma School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics Capital Aerospace Machinery Company Division of Science & Technology Information General Research Institute for Nonferrous Metals

The effects of annealing on the phase transformation behavior and superelasticity of cold-rolled Ti50Ni48Fe2 shape memory alloy were extensively investigated. Curves of temperature dependence of electrical resistivity reveal that both the cold-rolled and annealed specimens exhibit a B2→R→B19’two-stage martensitic transformation upon cooling and a B19’→B2 one-stage transformation upon heating, although the austenitic transformation temperature decreases with the increase of the annealing temperature. Tensile stress–strain curves show the critical stress for stress-induced martensite（rSIM）of Ti50Ni48Fe2 alloys decreases with the increase of annealing temperature due to the decrement of dislocation density caused by the recrystallization. As a result, the rSIM decreases. Upon a cold-rolling and annealing at 623 K for30 min, the Ti50Ni48Fe2 alloy exhibits excellent superelasticity with the maximum recoverable strain of 5.8 % at a loading strain of 7 %. In such a case, a complete superelasticity of 5 % can be obtained in the Ti50Ni48Fe2 alloy after deformation increasing to 15 cycles.

关键词： Shape memory alloys cold-rolling Annealing Superelasticity

Finite Element Simulation of cold-rolling Process of Shaped Steel Tube for Driving Shaft

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Journal of Iron and Steel Research(International) 2010年第8期17卷 25-29页

作者： SHUAI Mei-rong LIU Shao-bo GAO Cong-min QIN Jian-ping College of Material and Science Engineering Taiyuan University of Science and TechnologyTaiyuan 030024ShanxiChina Xi'an Heavy Machinery Research Institute Xi'an 710032ShaanxiChina

Based on the deformation characteristics of Y-type mill,a finite element model for simulating the formation process of shaped steel tube for driving shaft is *** distributions of stress and strain were obtained from the *** outer diameter and transverse wall thickness were also analyzed *** was done on Y-type mill.A comparison between simulation results and experiment results shows that the simulated results of shaped steel tube are in good agreement with the on-site *** model could provide the basis for theoretical research and engineering applications of shaped steel tube rolling process.

关键词： shaped steel tube Y-type mill cold-rolling simulation experiment

Effect of deformation twinning on the evolution of texture in TWIP steels during cold-rolling

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Baosteel Technical Research 2012年第1期6卷 7-11页

作者： ZHONG Yong1,2),WANG Li 1,2),LIANG Gaofei1,2) and JIANG Yunzhe1,3) 1) Auto Steel Division,Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 201900,China 2) State Key Laboratory of Development and Application Technology of Automotive Steels (Baosteel),Shanghai 201900,China 3) School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China Auto Steel Division Research InstituteBaoshan Iron &Steel Co. Ltd. Shanghai 201900 China State Key Laboratory of Development and Application Technology of Automotive Steels(Baosteel) Shanghai 201900 China Auto Steel Division Research InstituteBaoshan Iron &Steel Co. Ltd. Shanghai 201900 China School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

Texture evolution of high-manganese twining-induced plasticity (TWIP) steels (Fe-16Mn-0.6C) during cold-rolling is studied by means of quantitative orientation distribution function (ODF)*** reductions of the specimens during cold-rolling are 10%,20%,30%,50% and 65%,*** of texture is of the Brass type,which is typical for low-stacking fault energy (SFE) *** contribution of deformation twinning to the development of texture is clearly illustrated by the monotonic increase of the twinned Cu *** the present study,the deformation twinning was identified as significantly contributing to deformation up to the maximum reduction *** results are useful for the prediction and control of the texture in TWIP steels.

关键词： high-manganese steel deformation twin SFE texture cold-rolling

Strengthening and toughening bulk Ni_(2)CoFeV_(0.5) medium-entropy alloy via thermo-mechanical treatment

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Journal of Materials Science & Technology 2023年第20期151卷 19-29页

作者： Lei Gu Rui Hou Yi Liu Guang Chen Jihua Liu Gong Zheng Ruisheng Zhang Yonghao Zhao National Key Laboratory of Advanced Casting Technologies MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials TechnologyEngineering Research Center of Materials Behavior and DesignMinistry of EducationNanjing University of Science and TechnologyNanjing 210094China

Single-phase face-centered cubic(fcc)medium-and high-entropy alloys(MEAs/HEAs)have high ductility but low yield *** this work,the microstructures of single-phase fcc Ni_(2)CoFeV_(0.5) MEAs were tailored by cold-rolling and subsequent annealing and typical heterogeneous lamella(HL)structures composed of recrystallized micro-grain lamellae(with an averaged grain size of∼4μm)and nonrecrystallized nano-/ultrafine-grain lamellae were *** tests revealed that most HL samples exhibited excellent strength and ductility *** HL sample with∼23 vol%recrystallized grains annealed at 590℃ for 1 h had a high yield strength of 1120 MPa and a good fracture elongation of 12.3%,which increased by 5%and 46%,respectively compared with those of as-rolled ***-induced yield strength increase is attributed to high-density annealing twin boundaries(TBs)in the recrystallized grains,the annihilation of mobile dislocations inside the non-recrystallized grains,and extra heterodeformation-induced strengthening produced by the HL ***-Petch relationship of Ni_(2)CoFeV_(0.5) MEA can be reasonably described by counting both TBs and grain boundaries,with lattice friction stress of 87.3 MPa and coefficient of 722.8 MPaμm1/*** work provides optional and controllable solutions for preparing MEAs/HEAs with excellent mechanical properties by low-cost and high-efficiency thermomechanical treatments.

关键词： Medium-entropy alloys Microstructures Strength and ductility Heterogeneous lamella structure cold-rolling Annealing

Phase transformation behaviors and mechanical properties of Ti_(50)Ni_(49)Fe_1 alloy with severe plastic deformation

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Rare Metals 2013年第5期32卷 448-452页

作者： Wen Ma Bin Chen Fu-Shun Liu Qing Xu Division of Science and Technology Information General Research Institute for Nonferrous Metals School of Material Science and Engineering Beijing University of Aeronautics and Astronautics Metrology and Phsico-Chemical Institute Capital Aerospace Machinery Company

In this work, transformation behaviors and mechanical properties of cold-rolled shape memory alloy TisoNia9Fel by severe plastic deformation （SPD） were intensively investigated. The phase transformation behaviors, phase analysis, and microstructures were characterized by differential scanning calorimetry （DSC）, X-ray diffraction （XRD）, and transmission electron microscopy （TEM）, respectively. Tensile testing was performed to analyze the effect of SPD on the mechanical properties and shape memory of TisoNi49Fel alloy. When the thickness reduction is beyond 30 %, the martensitic transformation is suppressed. After cold-rolling, the alloy is mainly com- posed of B2 parent phases with some stress-induced martensitic B 19t phases, and high density of dislocations are generated and the grains are obviously refined. The yield stress ab significantly raises from 618 MPa of 0 % cold rolling to 1,338 MPa of 50 % SPD. Shape-memory effect increases from 6.5 % without cold rolling to 8.5 % after 30 % SPD, ascribed to the induced defects in cold rolling. Those results indicate that TisoNi49Fel alloy has improved mechanical properties and potential commercial applications after SPD.

关键词： TiNiFe alloy cold-rolling Severe plasticdeformation (SPD) Shape memory effect

Effect of Heat Treatment on Microstructure and Property of Al-Sn-Pb Bearing Material

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Journal of Iron and Steel Research(International) 2006年第2期13卷 73-76页

作者： XU Guang-ming LI Bao-mian CUI Jian-zhong Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern University Shenyang 110004 Liaoning China

AlSn8Pb2Si2.5Cu0.8Cr0.2 is a bush material with high hardness, and the main elements tin and plumbum mainly exist along the grain boundary, resulting in bad plasticity and confectioning. It is found that the continuous tin and lead distributing along grain boundary are broken by cold-rolling, and their shape is spheroidized and uniform through annealing at constant temperature. The continuous precipitated phase composed of tin and lead doesn＇t exist along grain boundary. The properties of bush material are greatly increased.

关键词： bush material cold-rolling annealing spheroidization

TRANSFORMATION INDUCED SUPERPLASTICITY IN 18Ni MARAGING STEEL

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Acta Metallurgica Sinica(English Letters) 1992年第4期5卷 278-281页

作者： YIN Zhongda Harbin Institute of Technology,Harbin,ChinaZHOU Yongkang Shanghai Centrifugal Machinery Research Institute,Shanghai,China Harbin Inst of Technology Harbin China

After exploring the influence of stress,cold-rolling reduction and cooling rate on transforma- tion induced strain,the transformation induced superplasticity forming technique of the 18Ni maraging steel(2450 MPa)was *** 14 times γα′ cyclic transformation,the limited elongation of 320% can be obtained in 60% cold-rolled *** observation revealed that the morphology of stress induced martensite is massive.

关键词： maraging steel transformation induced superplasticity cold-rolling

Deformation and recrystallization behavior of a Fe-30Mn-4Si-3Al-0.097C steel

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Baosteel Technical Research 2010年第S1期4卷 49-页

作者： XUE Wenying~(1)),MA Wenjun~(2)),ZHANG Rongxing,HE Tong~(3)),SHEN Yongfeng~(2)) 1) The State Key Lab of rolling & Automation,Northeastern University,Shenyang 110004,China 2) Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),Northeastern University,Shenyang 110004,China 3) Institute of Northeastern University,Shenyang 110004,China

It is fundamentally important to understand the influence of strain on the density of deformation twins in TWIP steel because twinning is its dominant deformation *** deformation behavior of a Fe -30Mn - 4Si-3Al-0.097C steel has been investigated by X -ray diffraction(XRD),electron backscatter diffraction (EBSD) and transmission electron microscopy(TEM) *** with an average grain size of 10μm was deformed in cold - rolling with a reduction of 10%,20%,30%,40%,50%,60%and 70%,respectively. The mechanical properties of the cold - rolled samples were further investigated by tensile *** yield strength (σy) and ultimate - tensile - strength(σUTS) of the as - prepared sample is 480 MPa and 850 MPa, ***,under cold rolling deformation,the tensile strength obviously increases with an increase in rolling *** sample with a rolling reduction of 10%exhibitsσy of 610 MPa andσUTS of - 1000 MPa. The yield strength and tensile strength are further enhanced up to 1320 MPa and 1 378 MPa for the specimen with a rolling reduction of 70%,regardless of the poor ductility of 6.7%.The deformation microstructures were studied by EBSD and TEM *** is found that,with increasing rolling reduction,the average distance between deformation twins decreases gradually while the density of deformation twins(the length of twin boundary in unit area) exhibit a maximum value at 40%cold-rolling + *** statistics analysis reveals grain orientation is closely related to the deformation twins and the underlying mechanism governing the twinning is discussed.

关键词： TWIP steel twin density cold-rolling deformation mechanism texture

Research and practice on the vacuum filter in emulsion system for tandem cold strip mill

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Baosteel Technical Research 2010年第S1期4卷 115-页

作者： ZHOU Guangsheng,LIU Xingxiang and ZHOU Yujun Baosteel Engineering & Technology Group Co.,Ltd.,Shanghai 201900,China

This paper introduces working principle and technical features of vacuum filter in emulsion system for tandem cold strip *** on specific cases,this paper analyses and assesses the effect before and after using the emulsion system with the usage of the vacuum filter for strip *** with the effect when using the first generation vacuum filter,the emulsion quality is improved significantly by using the second generation vacuum filter,which at the same time ensures steady operation of the rolling mill and surface quality of the mill products. As a result,investment and running costs are lowered,emissions of the waste emulsion are reduced,waste water treatment costs are reduced and so as the environmental *** can be seen the second generation vacuum filter has obvious economic and environmental ***,it suggests that the filter should be used widely in the field of automotive,environmental protection rolling steel and nonferrous metals.

关键词： cold-rolling emulsion vacuum filter research assessment