文献类型：期刊文献

英文题名：Role of martensitic transformation sequences on deformation-induced martensitic transformation at high strain rates: A quasi in-situ study

作者：Huang, Minghao[1];Yuan, Jiahua[1];Wang, Jinliang[2];Wang, Lingyu[1];Mogucheva, A.[3];Xu, Wei[1]

机构：[1]Northeastern Univ, State Key Lab Rolling & Automat, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China;[2]Guangdong Ocean Univ, Sch Mech & Power Engn, Zhanjiang 524000, Peoples R China;[3]Belgorod State Univ, Lab Mech Properties Nanoscale Mat & Superalloys, Belgorod 308015, Russia

年份：2022

卷号：831

外文期刊名：MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

收录：SCI-EXPANDED(收录号：WOS:000730103800001)、、EI(收录号：20214611154890)、Scopus(收录号：2-s2.0-85118842705)、WOS

基金：The research was financially supported by the National Natural Science Foundation of China (No. U1808208and 51961130389) and National Key Research and Development Program (No. 2021YFE0204100) Major scientific and technological innovation pro-jects of Shandong Province (Grant No. 2019TSLH0103) .

语种：英文

外文关键词：Strain rate; Deformation-induced martensitic; transformation; Nucleation; Martensitic transformation sequence; Variant selection

外文摘要：For the mechanical behavior of steels with metastable austenite, it was widely accepted that high strain rates could weaken deformation-induced martensitic transformation (DIMT) and reduce work-hardening behavior. This limits the application of these steels for energy-absorption applications, e.g., impact conditions. However, the mechanism of strain-rate dependent DIMT is still not well understood and it greatly limited the further alloy design. Thus, with the aim of revealing the intrinsic relations between strain rate and martensitic transformation, quasi-in-situ EBSD (Electron Backscatter Diffraction) tests were performed under different strain rates in this study. The influence of the martensitic transformation sequences on the DIMT volume fraction was investigated. With increasing strain rate, the gamma -> e ->alpha' transformation was inhibited, and the gamma ->alpha' transformation sequences dominated. The martensitic transformation sequences firstly affect the nucleation behavior. The alpha '-martensite nucleation sites changed from e or twin to twin only, and thus, the alpha '-martensite nucleation barrier increased. In addition to nucleation, the variant selection phenomenon caused by the absence of e-martensite under high strain rates increased the elastic strain energy, which inhibited the growth of alpha '-martensite. By affecting both nucleation and growth, high strain rates suppress the gamma -> e ->alpha' transformation, and inhibit DIMT kinetics. Thus, by tailoring the martensitic transformation sequences, two methods are proposed to enhance DIMT behavior via suitable control of the stacking fault energy. This work provides a comprehensive explanation for the strain-rate dependence of DIMT, which can be used to tailor the mechanical properties of steels with metastable austenite.