In situ neutron diffraction analysis of microstructural evolution-dependent stress response in austenitic stainless steel under cyclic plastic deformation

In situ neutron diffraction analysis of microstructural evolution-dependent stress response in austenitic stainless steel under cyclic plastic deformation
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循环塑性变形下奥氏体不锈钢微观结构演化相关应力响应的原位中子衍射分析

DOI:
10.1016/j.matdes.2022.110965
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发表时间:
2022
期刊:
影响因子:
8.4
通讯作者:
Koichi Akita
Koichi Akita
中科院分区:
材料科学1区
文献类型:
--
作者:
Masayoshi Kumagai;Masatoshi Kuroda;Takashi Matsuno;Stefanus Harjo;Koichi Akita

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了解金属中的疲劳现象对于工程系统中的机械性能具有重要意义。通过衍射线轮廓分析研究了奥氏体不锈钢在循环塑性变形过程中的微观结构演变;然而,在基体(奥氏体)和变形诱导马氏体中应力分配时,其微观结构相关的机械响应在很大程度上仍未被探索。在这项研究中,奥氏体不锈钢的应力响应分析进行中子衍射。奥氏体中的相应力与相内的位错密度有很好的相关性。马氏体中的实际应力几乎是奥氏体中假设应力和相应力的一半。然而,表观应力(从实际应力中减去残余应力)与假设应力相似,因为马氏体包含相当大的压缩残余应力(约1 GPa)。总的来说,峰值载荷下的载荷应力可以通过在奥氏体和马氏体上分担应力来解释。
Understanding fatigue phenomena in metals is of great significance for mechanical performance in engineering systems. Microstructural evolution in austenitic stainless steels during cyclic plastic deformation has been studied via diffraction line profile analysis; however, their microstructure-dependent mechanical response upon stress partitioning in the matrix (austenite) and deformation-induced martensite has remained largely unexplored. In this study, the stress response analysis of austenitic stainless steel was performed using neutron diffraction. The phase stress in the austenite correlated well with the dislocation density in the phase. The actual stress in the martensite was nearly half of the assumed stress and the phase stress in the austenite. However, the apparent stress (the residual stress subtracted from the actual stress) was similar to the assumed stress as the martensite contains a fairly large compressive residual stress (approximately 1 GPa). Overall, the loading stresses at peak loads can be explained by sharing stress on the austenite and martensite.
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