生物医用316L奥氏体不锈钢的形变组织

doi:10.13251/j.issn.0254-6051.2021.12.026

金属热处理 ›› 2021, Vol. 46 ›› Issue (12): 162-167.DOI: 10.13251/j.issn.0254-6051.2021.12.026

生物医用316L奥氏体不锈钢的形变组织

李鹏涛^1,2, 刘金旺¹, 罗贤¹, 陈建新³

1.西北工业大学凝固技术国家重点实验室, 陕西西安 710072;
2.西安理工大学材料科学与工程学院, 陕西西安 710072;
3.西北工业大学化学与化工学院, 陕西西安 710072

收稿日期:2021-09-22 出版日期:2021-12-25 发布日期:2022-02-18
作者简介:李鹏涛(1985—),男,讲师,博士研究生,主要研究方向为生物合金设计及其性能研究,E-mail:lipengtao_1985@163.com
基金资助:
国家自然科学基金青年基金(51901184);国家自然科学基金面上项目(21975204)

Deformation microstructure of biomedical 316L austenitic stainless steel

Li Pengtao^1,2, Liu Jinwang¹, Luo Xian¹, Chen Jianxin³

1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an Shaanxi 710072, China;
2. Department of Materials Science and Engineering, Xi'an University of Technology, Xi'an Shaanxi 710072, China;
3. School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an Shaanxi 710072, China

Received:2021-09-22 Online:2021-12-25 Published:2022-02-18

摘要/Abstract

摘要： 借助扫描电镜、电子背散射衍射和透射电镜组织观察,对生物医用奥氏体不锈钢316L的形变组织进行了多尺度深入研究,其工程应变量范围为2%~40%。结果表明,当应变>20%时,316L奥氏体不锈钢中的<001>和<111>取向平行于拉伸方向,即出现了大量的变形孪晶和马氏体。从微米尺度和纳米尺度对孪晶和马氏体相变做详细分析发现,形变首先诱发形成变形孪晶,由于孪晶界减小了位错平均自由程而引起位错塞积,进一步诱发马氏体的转变。随着变形量的增加出现了更多的孪晶和α-马氏体,马氏体相变的过程只有γ→α转变,α马氏体主要分布在孪晶界附近,特别是孪晶交叉的位置。其中,奥氏体基体和α-马氏体之间的取向关系为:[011]_γ//[011]_α,(420)_γ//(123)_α。

关键词: 奥氏体不锈钢, 马氏体相变, 形变机制, 孪晶

Abstract: Deformation behaviour in engineering strain range of 2%-40% of the 316L biomedical austenitic stainless steel was investigated in depth at multiple scales by means of EBSD, SEM and TEM. The results indicate that when the strain is more than 20%, the <001> and <111> orientations in 316L austenitic stainless steel are gradually parallel to the tensile direction, and a large number of deformation twins and martensite appear during the deformation process. From the micro-scale and nano-scale, based on the detailed analysis of the twins and martensitic transition, it is found that the deformation firstly induces the formation of deformotiou twins. The twin boundary reduces the mean free path of dislocations and causes dislocation pile-up packing, which further induces the formation of deformation twins. With the increase of deformation, more twins and α-martensite appear. The process of martensitic transition is only γ→α, which α-martensite is mainly distributed near the twin boundaries, especially at the twin intersection. The orientation relationships between the austenitic matrix and the α-martensite are [011]_γ//[011]_α and (420)_γ//(123)_α.

Key words: austenitic stainless steel, martensitic transformation, deformation mechanism, twin

中图分类号:

TG172

李鹏涛, 刘金旺, 罗贤, 陈建新. 生物医用316L奥氏体不锈钢的形变组织[J]. 金属热处理, 2021, 46(12): 162-167.

Li Pengtao, Liu Jinwang, Luo Xian, Chen Jianxin. Deformation microstructure of biomedical 316L austenitic stainless steel[J]. Heat Treatment of Metals, 2021, 46(12): 162-167.

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生物医用316L奥氏体不锈钢的形变组织

Deformation microstructure of biomedical 316L austenitic stainless steel

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