Mechanical Properties and Martensitic Transformation Behavior of 316LN Stainless Steel Under Cryogenic Deformation

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-08-05 DOI:10.1002/srin.202400330

Bixi Li, Hengcheng Zhang, Shanshan Wu, Liancheng Xie, Fuzhi Shen, Jijun Xin, Chuanjun Huang, Wei Wang, Laifeng Li

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Abstract

Digital image correlation (DIC) technology can capture strain anomalies and predict crack initiation providing early warning of material failure. Herein, DIC technique is used to calculate the full-field strain by analyzing the grayscale patterns of speckle images during the tensile process. This allowed for an analysis of the microstructure evolution of the 316LN austenitic stainless steel (SS) at cryogenic temperatures. Deformation behavior of the 316LN SS at cryogenic temperatures is further analyzed using electron backscatter diffraction technology and transmission electron microscopy. Based on the strain field obtained by the DIC technique, a comprehensive analysis of the martensite volume fraction at different strains can be conducted. The results show that the strain localization under cryogenic deformation is related to martensitic transformation, while the random distribution of slip bands aligns with local strain peak values. Notably, fracture under cryogenic deformation occurs in regions where the strain field reaches its peak, rather than at locations with the maximum strain value.

Abstract Image

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316LN 不锈钢在低温变形下的力学性能和马氏体转变行为

数字图像相关（DIC）技术可以捕捉应变异常并预测裂纹的产生，为材料失效提供早期预警。在这里，DIC 技术通过分析拉伸过程中斑点图像的灰度模式来计算全场应变。这样就可以分析 316LN 奥氏体不锈钢（SS）在低温下的微观结构演变。利用电子反向散射衍射技术和透射电子显微镜进一步分析了 316LN 不锈钢在低温下的变形行为。根据 DIC 技术获得的应变场，可以对不同应变下的马氏体体积分数进行全面分析。结果表明，低温变形下的应变局部化与马氏体转变有关，而滑移带的随机分布与局部应变峰值一致。值得注意的是，低温变形下的断裂发生在应变场达到峰值的区域，而不是最大应变值的位置。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.