用中子衍射原位观察sus304不锈钢拉伸变形过程中变形诱发马氏体转变——第二部分:相变和织构形成机制

IF 1.3 Q3 INSTRUMENTS & INSTRUMENTATION
Y. Onuki, S. Sato
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引用次数: 6

摘要

本文利用原位中子衍射技术观察了SUS304不锈钢拉伸变形过程中γ奥氏体、ε马氏体和α′马氏体的织构发展。结合电子背散射衍射(EBSD)测量的微观结构和局部取向,基于中子衍射结果,研究了SUS304不锈钢变形诱发马氏体相变(DIMT)的机制。结果表明,ε马氏体继承了γ奥氏体的织构,即它们的主要成分可以通过Shoji–Nishiyama取向关系连接。基于{111}⟨2’11⟩滑移系统的Schmid因子对变体选择进行了定性评估。结果表明→钢试样中容易发生α′转变。因此,通过EBSD观察到的α′马氏体相的体积分数高于通过中子衍射观察到的体积分数。此外,在0.42的真实应变下,在钢样品中观察到由两种α′马氏体变体组成的包结构。然而,变体的原始取向与γ或ε相中的主要成分不一致。这表明两种α′马氏体变体是由γ基体的损失组分直接转化而来的。这些结果表明→ε→α’DIMT首先在钢样品中被激活,之后γ→α’DIMT在变形后期被激活。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
In Situ Observation for Deformation-Induced Martensite Transformation during Tensile Deformation of SUS 304 Stainless Steel by Using Neutron Diffraction PART II: Transformation and Texture Formation Mechanisms
Herein, the texture developments of γ austenite, ε martensite, and α’ martensite during the tensile deformation of SUS 304 stainless steel were observed by using the in situ neutron diffraction technique. Combined with the microstructure and local orientations measured by electron backscattered diffraction (EBSD), the mechanisms involved in the deformation-induced martensite transformation (DIMT) in the SUS 304 stainless steel were examined based on the neutron diffraction results. The results revealed that the ε martensite inherited the texture of the γ austenite, that is, their main components could be connected by Shoji–Nishiyama orientation relationship. The variant selection was qualitatively evaluated based on the Schmid factors of the {111}⟨2¯11⟩ slip systems. The results revealed that the ε→α’ transformation occurred easily in the steel sample. Consequently, the volume fraction of the α’ martensite phase observed by EBSD was higher than that observed by neutron diffraction. In addition, at a true strain of 0.42, a packet structure consisting of two α’ martensite variants was observed in the steel sample. However, the original orientation of the variants did not correspond to the main components in the γ or ε phases. This suggests that the two α’ martensite variants were transformed directly from the lost component of the γ matrix. These results indicate that the γ→ε→α’ DIMT was first activated in the steel sample, after which the γ→α’ DIMT was activated at the later stage of deformation.
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来源期刊
CiteScore
2.80
自引率
28.60%
发文量
27
审稿时长
11 weeks
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