Cryogenic work-hardening behavior for a metastable austenitic stainless steel at liquid nitrogen temperature

液氮 材料科学 奥氏体 亚稳态 冶金 加工硬化 奥氏体不锈钢 工作(物理) 硬化(计算) 氮气 低温 动火作业 复合材料 热力学 工具钢 化学 微观结构 腐蚀 物理 图层(电子) 有机化学
作者
Wangjun Cheng,Dongdong Cui,Yaoning Sun,Wei Liu,Yifei Xu,Bin Liu
出处
期刊:Materials Science and Engineering A-structural Materials Properties Microstructure and Processing [Elsevier]
卷期号:861: 144352-144352 被引量:1
标识
DOI:10.1016/j.msea.2022.144352
摘要

An experimental study was conducted to analyze the undulated work-hardening behavior of S30408 metastable austenitic stainless steel at liquid nitrogen (LN 2 ) temperature. The flow stress curve, work-hardening process, strength, and ductility were studied by uniaxial tensile tests at both room temperature (RT) and −196 o C. Based on the scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) observations, the effects of the cryogenic temperature and deformation degree on the dislocation evolution, phase transformation, slip behavior, and hardening behavior were analyzed. The cryogenic work-hardening mechanism regarding the initial hardening, undulated hardening, and unstable hardening throughout the whole tensile process was elaborated. The correlation between macroscopic work-hardening and microscopic martensitic transformation accompanied by a localized dislocation strengthening was illuminated. It was revealed that the high strength of the austenitic steel during the cryogenic deformation process resulted from the α′-martensite transformation accompanied by dislocation strengthening. A critical point of phase content was obtained at a strain of 0.095 at −196 o C. The undulated work-hardening at cryogenic temperature was mainly attributed to the alternating evolution of the α′-martensite and austenite phases with a non-uniform deformation mode. • The undulated work-hardening behavior of a metastable austenitic stainless steel was investigated at liquid nitrogen temperature. • The effects of cryogenic temperature and deformation degree on dislocation, slip behavior, phase transformation and work-hardening behavior were analyzed. • The correlation between macroscopic work-hardening and microscopic martensitic transformation accompanied by localized dislocation strengthening was illuminated. • An obvious critical point of phase content was obtained at a strain of 0.095 at −196 °C.
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