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Multi-scale crystal plasticity finite element simulations of the microstructural evolution and formation mechanism of adiabatic shear bands in dual-phase Ti20C alloy under complex dynamic loading

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Journal of Materials Science & Technology 2020年第24期59卷 138-148页

作者： Yu Zhou Qunbo Fan Xin Liu Duoduo Wang Xinjie Zhu Kai Chen School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China National Key Laboratory of Science and Technology on Materials Under Shock and Impact Beijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401135China

A dynamic compression test was performed on α+β dual-phase titanium alloy Ti20C using a split Hopkinson pressure *** formation of adiabatic shear bands generated during the compression process was studied by combining the proposed multi-scale crystal plasticity finite element method with experimental *** complex local micro region load was progressively extracted from the simulation results of a macro model and applied to an established three-dimensional multi-grain microstructure ***,the evolution histories of the grain shape,size,and orientation inside the adiabatic shear band were quantitatively *** results corresponded closely to the experimental results obtained via transmission electron microscopy and precession electron ***,by calculating the grain rotation and temperature rise inside the adiabatic shear band,the microstructural softening and thermal softening effects of typical heavily-deformed α grains were successfully *** results revealed that the microstructural softening stress was triggered and then stabilized(in general)at a relatively high *** indicated that the mechanical strength was lowered mainly by the grain orientation evolution or dynamic recrystallization occurring during early plastic ***,thermal softening increased linearly and became the main softening ***,in the final stage,the thermal softening stress accounted for 78.4% of the total softening stress due to the sharp temperature increase,which inevitably leads to the stress collapse and potential failure of the alloy.

关键词： Titanium alloy Adiabatic shear band Multi-scale crystal plastic finite element method(CPFEM) Orientation evolution softening mechanism

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Influence of thermomechanical treatment on recrystallization and softening resistance of Cu-6.5Fe-0.3Mg alloy

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Transactions of Nonferrous Metals Society of China 2024年第9期34卷 2900-2917页

作者： Zhen-xia LIU Da-wei YUAN Xin LUO Lan-hao WANG Jin-shui CHEN Hui-ming CHEN Xiang-peng XIAO Bin YANG College of Advanced Copper Industry Jiangxi University of Science and TechnologyYingtan 335000China Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou 341000China

The recrystallization and softening resistance of a Cu-6.5Fe-0.3Mg(mass fraction,%)alloy prepared by Process 1(cold rolling heat treatment)and Process 2(hot/cold rolling heat treatment)were studied using Vickers hardness tests,tensile tests,scanning electron microscopy and transmission electron *** softening temperature,hardness and tensile strength of the alloy prepared by Process 2 were 110°C,HV 15 and 114 MPa higher,respectively,than those of the alloy prepared by Process 1 after aging at 300°*** recrystallization activation energy of the alloys prepared by Process 1 and Process 2 were 72.83 and 98.11 kJ/mol,*** pinning effects of the precipitates of the two alloys on grain boundaries and dislocations were basically the *** softening mechanism was mainly attributed to the loss of dislocation *** higher Fe fiber density inhibited the average free migration path of dislocations and grain boundary migration in the alloy,which was the main reason for higher softening temperature of the alloy prepared by Process 2.

关键词： Cu−6.5Fe−0.3Mg alloy hot rolling recrystallization activation energy softening mechanism dislocation strengthening

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Hot deformation behavior and hot-metal-gas-forming process of V micro-alloyed high manganese steel

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Journal of Iron and Steel Research International 2024年第9期31卷 2271-2280页

作者： Yong-gang Yang Wang-nan Zuo Mei Xu Chang-hui Yuan Jiang Chang Lei Qi Zhen-li Mi National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing100083China State Key Laboratory of Advanced Stainless Steel Materials Taiyuan Iron and Steel(Group)Co.Ltd.Taiyuan030003ShanxiChina Shandong Taishan Steel Group Co. Ltd.Jinan271100ShandongChina

The hot deformation behavior of a newly designed V micro-alloyed high manganese steel(HMnS)was investigated in order to guide the development of the hot-metal-gas-forming ***-pass hot compression experiments were conducted in the temperature range of 950–1100℃ and the strain rate range of 0.05–10 s^(−1),and the stress–strain curves and the corresponding softening mechanism of the V micro-alloyed HMnS were *** show that two types of stress–strain curves,representing the work hardening(WH)-dynamic recovery(DRV)-dynamic recrystallization(DRX)mechanism and the WH–DRV mechanism,respectively,occur during the deformation ***,the WH–DRV–DRX mechanism gradually transforms into the WH–DRV mechanism with the increasing strain rate and decreasing deformation *** types of constitutive models considering the softening mechanism difference were established and verified by additional hot-deformation *** processing map of the HMnS was established and correlated well with the microstructure evolution *** on the constitutive models and processing map,the optimal processing parameter range and flow stress of HMnS for the hot-metal-gas-forming were determined.

关键词： High manganese steel Hot-metal-gas-forming Deformation behavior Microstructure softening mechanism

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Hot Deformation Behavior of Ni_3Al-based Alloy MX246A

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Journal of Iron and Steel Research International 2014年第2期21卷 264-268页

作者： Jian-tao WANG Wei HAN He-li LUO Shang-ping LI Central Iron and Steel Research Institute Group

The hot deformation behavior of homogenized Nia Al-based alloy MX246A has been characterized on the basis of its flow stress variation obtained by isothermal constant true strain rate compression testing on the MTS 810 machine in the temperature range of 1 150--1225 ℃ and strain rate range of 0. 001-0.1 s-1. Microstructural obser- vation revealed striped secondary γ＇ phase which was vertical to compression axis, and precipitation of fine ternary γ＂ phase. The amount of striped secondary γ＇ phase reduced and that of fine ternary γ＇ phase increased with increasing temperature and decreasing strain rate. The material exhibited peak stress followed by flow softening, but no obvious steady-state flow behavior. Microstructural investigations have shown no dynamic recrystallization happened. TEM studies indicated that the flow softening was controUed by dynamic recovery mechanism.

关键词： Ni3 AI multiphase alloy hot deformation flow stress softening mechanism

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Characterization of hot deformation behavior of AA2014 forging aluminum alloy using processing map

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Transactions of Nonferrous Metals Society of China 2017年第8期27卷 1677-1688页

作者： Peng-wei LI Hui-zhong LI Lan HUANG Xiao-peng LIANG Ze-xiao ZHU School of Materials Science and Engineering Central South University Changsha 410083 China Key Laboratory of Nonferrous Metal Materials Science and Engineering Ministry of Education Central South University Changsha 410083 China State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China

The hot deformation behavior of AA2014forging aluminum alloy was investigated by isothermal compression tests attemperatures of350-480°C and strain rates of0.001-1s-1on a *** corresponding microstructures of thealloys under different deformation conditions were studied using optical microscopy(OM),electron back scattered diffraction(EBSD)and transmission electron microscopy(TEM).The processing maps were constructed with strains of0.1,0.3,*** results showed that the instability domain was more inclined to occur at strain rates higher than0.1s-1and manifested in theform of local non-uniform *** the strain of0.7,the processing map showed two stability domains:domain I(350-430°C,0.005-0.1s-1)and domain II(450-480°C,0.001-0.05s-1).The predominant softening mechanisms in both of the twodomains were dynamic *** microstructures were obtained in domain I,and an extended recovery occurred in domainII,which would lead to the potential sub-grain boundaries progressively transforming into new high-angle grain *** hot working parameters for the AA2014forging aluminum alloy were determined to be370-420°C and0.008-0.08s-1.

关键词： AA2014 aluminum alloy hot deformation behavior constitutive model processing map softening mechanism

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