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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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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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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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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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Discrete twinning dynamics and size-dependent dislocation-to twin transition in body-centred cubic tungsten

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Journal of Materials Science & Technology 2022年第11期106卷 33-40页

作者： Jiangwei Wang Anik H.M.Faisal Xiyao Li Youran Hong Qi Zhu Hongbin Bei Ze Zhang Scott X Mao Christopher R.Weinberger Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Department of Mechanical Engineering Colorado State UniversityCO 80523USA School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China Department of Mechanical Engineering and Materials Science University of PittsburghPittsburghPA 15261USA Wenzhou Key Laboratory of Novel Optoelectronic and Nano Materials Institute of WenzhouZhejiang UniversityWenzhou 325006China

Body-centred cubic(BCC) metals are known to have unstable intrinsic stacking faults and high resistance to deformation twinning, which can strongly influence their twinning behaviour. Though twinning mechanisms of BCC metals have been investigated for more than 60 years, the atomistic level dynamics of twinning remains under debate, especially regarding its impact on competition between twinning and slip. Here, we investigate the atomistic level dynamics of twinning in BCC tungsten(W) nanowires using in situ nanomechanical testing. Quantitative experimental studies directly visualize that deformation twins in W nanowires have a minimum size of six-layers and grow in increments of approximately three-layers at a time, in contrast to the layer-by-layer growth of deformation twins in face-centred cubic metals. These unique twinning dynamics induces a strong competition with ordinary dislocation slip,as exhibited by a size-dependent dislocation-to-twin transition in W nanowires, with a transition size of ~40 nm. Our work provides physical insight into the dynamics of twinning at the atomic level, as well as a size-dependent dislocation-twinning competition, which have important implications for the plastic deformation in a broad class of BCC metals and alloys.

关键词： Body-centred cubic deformation twin twinning dynamics Dislocation-to-twin transition In situ nanomechanical testing

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A revisit to the role of Mo in an MP35N superalloy:An experimental and theoretical study

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Journal of Materials Science & Technology 2023年第26期157卷 60-70页

作者： Qing Cheng Jinyong Mo Xiaoqing Li Xiandong Xu Center for High Resolution Electron Microscopy College of Materials Science and EngineeringHunan UniversityChangsha 410082China Institute of Massive Amorphous Metal Science School of Materials Science and Physics China University of Mining and TechnologyXuzhou 221116China Department of Materials Science and Engineering Applied Materials Physics KTH-Royal Institute of TechnologyStockholm SE-10044Sweden

Molybdenum(Mo)has been recognized as an essential alloying element of the MP35N(Co_(35.4)Cr_(22.9)Ni_(35.5)Mo_(6.2),at.%)superalloy for enhancing strength and corrosion ***,a full understanding of the addition of Mo on microstructure and mechanical properties of the Mo-free parent alloy is *** this work,we consider five(Co_(37.7)Cr_(24.4)Ni_(37.9))_(100-x)Mo_(x)(x=0,0.7,2.0,3.2,and 6.2)alloys,and reveal that yield/tensile strength and ductility are continuously increased for these alloys with increasing Mo content while a single-phase face-centered cubic structure remains *** is found that strong solid solution strengthening(SSS)is a main domain to the improved yield strength,whereas grain boundaries are found to soften by the Mo *** first-principles calculations demonstrate that a severe local lattice distortion contributes to the enhanced SSS,and the grain boundary softening effect is mostly associated with the decreased shear *** first-principles calculations and scanning transmission electron microscopy observations reveal that the stacking fault energy(SFE)reduces by the Mo *** calculated SFE value decreases from 0.4 mJ/m^(2) to-11.8 mJ/m^(2) at 0 K as Mo content increases from 0 at.%to 6.2 at.%,and experimentally measured values of SFE at room temperature for both samples are about 18 mJ/m^(2) and 9 mJ/m^(2),*** reduction of SFE promoted the generation of stacking faults and deformation twins,which sustain a high strain hardening rate,thus postponing necking instability and enhancing tensile strength and elongation.

关键词： Mo addition Solid solution strengthening Grain boundary softening Local lattice distortion First-principles simulations Stacking fault energy deformation twin

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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 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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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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