Deformation microstructure of biomedical 316L austenitic stainless steel

doi:10.13251/j.issn.0254-6051.2021.12.026

Abstract

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

CLC Number:

TG172

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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