Positive Strain Rate Sensitivity and Deformation Behavior of a Fe–29Mn–3Al–3Si TWIP Steel

查看全文 作　　者：Shucheng [1]Shen;Cuilan [1]Wu;Pan [1]Xie;Yuanrui [1]Liu

机构地区：[1]Center of High Resolution Electron Microscopy,College of Materials Science and Engineering,Hunan University,Changsha 410082,China

出　　处：《Acta Metallurgica Sinica(English Letters)》索引2022年第35卷第11期,共12页

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51801060,51831004 and 52171006)。 摘　　要：The Fe-29 Mn-3 Al-3 Si twin-induced plasticity(TWIP)steel is used to conduct quasi-static compression and dynamic impact deformation with strain rates ranging from 8.3×10^(-4) to 3800 s^(-1).The microstructures and properties of deformed samples under different strain rates were investigated comparatively.These results show that positive strain rate sensitivity was observed with the increase in strain rates and that there was a significant difference in strain rate sensitivity factor(m)between quasi-static compression(m=0.029)and dynamic impact deformation(m=0.190).Compared to the quasi-static compression,the dynamic impact deformation exhibited higher yield strength.Microstructural examination reveals that the primary twins were frequently found during the quasi-static compression process,and the secondary twins were rarely observed.However,the secondary and multi-fold deformation twins were florescent in the dynamic impact samples.At the initial stage of dynamic impact deformation,partial dislocations and staking faults on multiple conjugate{111}planes were simultaneously activated and produced a large number of Lomer-Cottrell dislocations,resulting in a large increase in yield strength during dynamic impact. 关键词：TWIP steel Dynamic deformation Strain rate sensitivity Multi-fold deformation twins

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Positive Strain Rate Sensitivity and Deformation Behavior of a Fe–29Mn–3Al–3Si TWIP Steel

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