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Effect of the deformation twin Density on the Corrosion Behavior in TWIP Steel

Journal of Iron and Steel Research International 2011年第S1期18卷 331-336页

作者： CHU Guo-dong,WEI Ying-hui,LI Da-zhao,TIAN Yun (College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China) Taiyuan Univ Technol Coll Mat Sci & Engn Taiyuan 030024 Shanxi Peoples R China

Based on its excellent tensile strength-ductility property combination,twinning-induced plasticity (TWIP) steel shows great potential in applications for structural components in automobile *** aim of this research is to investigate the corrosion resistance properties and corrosion mechanism under room temperature in TWIP *** influence of the deformation twin density on corrosion property was primarily considered by salt spray *** specimens used in the investigation are as-annealed and as-deformed *** microstructure and corrosion resistance property were characterized by scanning electron microscope (SEM),optical microscope (OM) and so *** are some annealing twins distributed randomly in austenitic grains in the as-annealed *** the specimen was subjected to tensile experiment,the density of the deformation twins increased sharply,which are different from the annealing twins in size and *** was found that the corrosion potential of the as-annealed is lower than that of the as-deformed and the corrosion current density behaves *** immersed in 5% NaCl solution salt spray for 48h,the as-deformed showed a bit better than the as-annealed in corrosion *** the time prolonged,the gap between the two specimens in corrosion resistance increased *** corrosion morphologies varied in color and *** investigation,carried out by SEM and EDS,indicated that as-annealed and the as-deformed followed pitting corrosion and uniform corrosion mechanism *** reason for the difference in corrosion mechanism is possibly the presence of the deformation *** deformation twins formed during the tensile test refine grains by way of *** twin boundaries largely belong to the coincidence site lattice (CSL),which is on lower energy *** suggests that the twins not only play a role in strengthening,but also improve effectively the corrosion resistance in TWIP steel.

关键词： TWIP steel corrosion deformation twin

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Effects of twin and stacking faults on the deformation behaviors of Al nanowires under tension loading

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Chinese Physics B 2012年第10期21卷 349-354页

作者：安敏荣宋海洋苏锦芳 School of Science Xi'an University of Posts and Telecommunications

The effects of twin spacing and temperature on the deformation behavior of nanotwinned Al under tensile loading are investigated using a molecular dynamic（MD） simulation *** result shows that the yield strength of nanotwinned Al decreases with the increase of twin spacing,which is related to the repulsive force between twin boundary and the *** result also shows that there is no strain-hardening at the yield *** the contrary,the stress is raised by strain hardening in the plastic *** addition,we also investigate the effects of stacking fault thickness and temperature on the yield strength of the Al *** simulation results indicate that the stacking fault may strengthen the Al nanowire when the thickness of the stacking fault is below a critical value.

关键词： molecular dynamic simulation deformation twin stacking fault

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INTERACTION BETWEEN V_4C_3 PARTICLES AND deformation twinS

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Acta Metallurgica Sinica(English Letters) 1991年第3期4卷 214-217页

作者： XIE Changsheng Huazhong University of Science and Technology,Wuhan,China

By using Moire′ pattern formed by the double diffraction of precipitated V_4C_3 and matrix of γ-phase,the nature of the structure of the interface between precipitated V_4C_3 and matrix as well as the retarding effect of V4C3 particles on the development of deformation twins have been *** is shown that partially coherent interfaces exist between V_4C_3 and ma- *** dislocations may transform into interfacial dislocations under external stress, and may move continuously through bypassing or cross-sliping.

关键词： V_4C_3 deformation twin Moire' pattern

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A new guide for improving mechanical properties of non-equiatomic FeCoCrMnNi medium-and high-entropy alloys with ultrasonic nanocrystal surface modification process

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Journal of Materials Science & Technology 2020年第24期59卷 37-43页

作者： Timothy Alexander Listyawan Hyunjong Lee Nokeun Park School of Materials Science and Engineering Yeungnam University280 Daehak-roGyeongsangbuk-do38541Republic of Korea Korea Institute of Industrial Technology Incheon21999Republic of Korea Institute of Materials Technology Yeungnam University280 Daehak-roGyeongsanGyeongsangbuk-do38541Republic of Korea

Ultrasonic nanocrystal surface modification (UNSM) treatment on non-equiatomic medium-and highentropy alloy (HEA) of Fex(CoCrMnNi)100-xis firstly introduced and its impact on microstructure and mechanical properties are *** UNSM,severe plastic deformation-induced dislocation and deformation twins (DTs) arise at the topmost ***,Fe60(CoCrMnNi)40(Fe60),which is classified as a medium-entropy alloy (MEA),exhibits ε-martensitic *** the room temperature tensile test,a high strength of ~600 MPa and ductility of ~65%elongation (strain to failure) is accomplished in *** formed DTs and ε-martensitic transformation by UNSM treatment plays a key role in retardation of necking point via both twinning-induced plasticity and transformation-induced ***,Fe20(CoCrMnNi)80(Fe20) comparatively shows low strength of ~550 MPa and ~40% elongation,owing to the low accommodation of DTs than *** research will provide new guidelines for enhancing the mechanical properties of MEA and HEA.

关键词： High-entropy alloys Ultrasonic nanocrystal surface modification deformation twin Microstructures Mechanical properties

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Effect of Mo and cold forging deformation on strength and ductility of cobalt-based alloy L605

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Journal of Iron and Steel Research International 2024年第7期31卷 1811-1823页

作者： Zhong-lin Wang Zhi-hua Gong Quan Li Han-sheng Bao School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014017Inner MongoliaChina Institute of Special Steels Central Iron and Steel Research Institute Co.Ltd.Beijing 100081China

Mo element was added to cobalt-based alloy L605,and cold forging deformation was *** effects of the addition and cold forging deformation on the microstructure and mechanical properties of the alloy were studied by thermodynamic calculation,electron backscatter diffraction,transmission electron microscopy,and X-ray *** stacking fault energy(SFE)of the alloy decreased after the addition,and the formation of stacking faults and intersections were promoted to improve the strength and *** tensile strength of the alloy with Mo increased from 1190 to 1702 MPa after 24%cold deformation,producing significant work *** strengthening mechanism is strain-induced martensitic transformation(SIMT)and deformation *** alloy,combined with Mo and after 24%deformation,had both high strength and ductility in comparison with the original cobalt-based alloy *** is attributed to the lower SFE which caused the increase in stacking fault *** the tensile process,theε-hcp phase was easily generated at the stacking fault to reduce the stress concentration and increase the *** SIMT by adjusting the density of stacking faults can improve the mechanical properties of cobalt-based ***ε-hcp phase,the interaction between deformation twins and dislocations,and the interaction between e-hcp phases during cold forging deformation caused local stress concentration,lowering ductility and toughness.

关键词： Cobalt-based alloy-Stacking fault energy Strain-induced martensitic transformation deformation twin Cold forging deformation

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Dynamic recrystallization-induced temperature insensitivity of yield stress in single-crystal Al1.2CrFeCoNi micropillars

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Science China(Technological Sciences) 2021年第1期64卷 11-22页

作者： HUANG RuiRui ZHANG Qian ZHANG Xuan LI JianGuo CAO TangQing YAO JiaHao XUE YunFei GAO HuaJian LI XiaoYan Center for Advanced Mechanics and Materials Applied Mechanics LaboratoryDepartment of Engineering MechanicsTsinghua UniversityBeijing 100084China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Mechanical and Aerospace Engineering College of EngineeringNanyang Technological UniversitySingapore 639798Singapore Institute of High Performance Computing A*STARSingapore 138632Singapore

High-entropy alloys, a new class of metallic materials, exhibit excellent mechanical properties at high temperatures. In spite of the worldwide interest, the underlying mechanisms for temperature dependence of mechanical properties of these alloys remain poorly understood. Here, we systemically investigate the mechanical behaviors and properties of Al_(1.2)CrFeCoNi(comprising a body-centered cubic phase) and Al_(0.3)CrFeCoNi(comprising a face-centered cubic phase) single-crystal micropillars with three orientations([100], [110], and [111]) at temperatures varying from 300 to 675 K by using in situ compression of micropillars inside a scanning electron microscope. The results show that the yield stresses of Al_(1.2)CrFeCoNi micropillars are insensitive to temperature changes, and their flow stresses and work hardening rates increase slightly with increasing temperature from 300 to550 K, which differs from the typical temperature dependence of yield/flow stresses in metals and alloys. In contrast,Al_(0.3)CrFeCoNi micropillars exhibit typical thermal softening. Furthermore, it is found that the Al_(1.2)CrFeCoNi micropillars exhibit a transition from homogenous deformation to localized deformation at a critical temperature, while the Al_(0.3)CrFeCoNi micropillars always maintain a well-distributed and fine slip deformation. Detailed transmission electron microscopy analyses reveal that dynamic recrystallization(involving dislocation tangles, and formation of dislocation cell structures and sub-grains)plays a key role in the observed temperature insensitivity of the yield stress and increasing flow stress(and work hardening rate)with increasing temperature in the Al_(1.2)CrFeCoNi micropillars, and that thermally activated dislocation slip leads to thermal softening of the Al_(0.3)CrFeCoNi micropillars. The differences in deformation modes and temperature dependence of the mechanical properties between Al_(1.2)CrFeCoNi and Al_(0.3)CrFeCoNi essentially originate from the d

关键词： high entropy alloy temperature insensitivity dynamic recrystallization micropillar deformation twin

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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

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Influence of carbon addition on mechanical properties of Fe-Mn-C twinning-induced plasticity steels

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Journal of Iron and Steel Research International 2022年第9期29卷 1446-1454页

作者： Peng Fu Zhi-bing Zheng Wei-ping Yang Hao-kun Yang School of Engineering Jiangxi Agricultural UniversityNanchang 330045JiangxiChina Institute of New Materials GuangdongAcademy of SciencesGuangdong Provincial iron Matrix Composite Engineering Research CenterGuangzhou 510650GuangdongChina Smart Manufacturing Division Hong Kong Productivity CouncilHong Kong 999077.China

Mechanical properties and microstructural evolution of Fe-22Mn-0.6C and Fe-22Mn-1.0C(wt.%)twinning-induced plasticity(TwIP)steels were investigated by monotonic,stress-relaxation and unloading-reloading tensile *** dynamic strain aging(DSA)effect,resulting from pinning of dislocations,effectively improved the dislocation activation volume of the two TWIP *** the meanwhile,DSA-facilitated twinning nucleation mechanism kept similar twinning capabilities of the two TWIP *** strain increasing,the formation of high-density deformation twins restricted the dislocation motion and reduced the activation volume with increasing ***,C addition simultaneously improved the ultimate tensile strength and uniform elongation,and significantly enhanced the friction stress,rather than back *** stronger short-range order effect,brought by friction stress,promotes the planar dislocation slipping,thus improving the work-hardening *** a result,the additional work-hardening capacity can be achieved in Fe-Mn-C with higher C addition.

关键词： twinning induced plasticity steel Work-hardening rate Dynamic strain aging Short-range order deformation twin

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Multistage serrated flow behavior of a medium-manganese high-carbon steel

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Journal of Iron and Steel Research International 2020年第9期27卷 1064-1072页

作者： J.Chen Y.Zhang J.J.Wang C.M.Liu S.X.Zhao Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationNortheastern UniversityShenyang 110819LiaoningChina Shenyang Industrial Transformation Upgrading Promotion Center Shenyang 110083LiaoningChina The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina School of Materials Science and Engineering Northeastern UniversityShenyang 110819LiaoningChina Central Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201999China

The deformation mechanisms and the flow stress behavior of a medium-manganese high-carbon steel during cold deformation at a strain rate of 10×5 s^-1 were explored using a universal testing machine,an X-ray diffractometer,a field emission scanning electron microscope and a high-resolution transmission electron *** results show that continuous step-up serrated flow behavior appears after the yielding point,and the true stress-strain curve is roughly divided into five stages based on distinctive densities and amplitudes of *** strengthening mechanisms of the experimental steel involve Cottrell atmosphere,twinning-induced plasticity(TWIP)efect and transformation-induced plasticity(TRIP)*** effect is the dominant deformation mechanism,and deformation twins formed by TWIP effect comprise primary,secondary and ***,TRIP effect arises in the local high-strain *** element plays a key role in the transformation of the deformation mechanism.A small amount of carbide precipitates around twin boundaries lead to the formation of local carbon-poor regions,and Md temperature and stacking fault energy of medium-manganese high-carbon steel are propitious to the occurrence of TRIP *** addition,the contributions of various deformation mechanisms to plasticity are calculated,and that of TWIP effect is the greatest.

关键词： Serrated flow deformation mechanism deformation twin twinning-induced plasticity Transformation-induced plasticity

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Effect of drawing speed on microstructure distribution and drawability in twinning-induced plasticity steel during wire drawing

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Journal of Iron and Steel Research International 2020年第5期27卷 577-587页

作者： Joong-ki Hwang School of Mechanical Engineering Tongmyong UniversityBusan 48520Republic of Korea

The effect of drawing speed on temperature rise and microstructure distribution in twinning-induced plasticity(TWIP)steel during wire drawing has been investigated to improve drawability for wire rod *** wire drawing process is performed at room temperature,heat is generated due to the plastic deformation and friction at the wire-die *** steel wires subjected to the low drawing speed(LD)of 0.5 m/min and the high drawing speed(HD)of 5.0 m/min were analyzed using the numerical simulation and electron backscatter diffraction ***,the specimens subjected to the HD had a higher drawability by about 18%compared to the LD,which is totally different from the general behavior of plain carbon pearlitic *** LD wire had uniform temperature distribution along the radial direction during wire *** contrast,the HD wire had a temperature gradient along the radial direction due to the higher frictional effect at surface:the minimum temperature of 58℃ at center area and the maximum temperature of 143 C at surface *** higher stacking fault energy of HD wire at the surface area due to the high temperature rise retarded twinning rate,resulting in the prevention of fast exhaustion in ductility in comparison with the LD wires since the earlier depletion of twins at surface area is known as the main reason for the fracture of TWIP steel during wire ***,HD process delayed the fracture strain of wire and increased the uniformity of microstructure and mechanical properties along the radial direction.

关键词： twinning-induced plasticity steel Wire drawing deformation twin Drawing speed Temperature rise

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