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Effect of shot peening strengths on microstructure and mechanical properties of 316L stainless steel prepared by 3D printing

In this paper, the influence of shot peening on the microstructure and mechanical properties of 3D printed 316L stainless steel was studied by OM, EBSD and mechanical properties testing. The changes in microstructure and mechanical properties of 316L stainless steel by 3D printing under different shot peening strengths were explored, which were drawn as follows: (1) the microstructure of 3D printed 316L stainless steel was greatly refined, and the thickness of ultrafine microstructure in the surface layer increased from 0?m to 112.5?m with the increase in peening strengths from 0MPa to 0.4MPa; (2) with the increase of peening strengths from 0MPa to 0.4MPa, the hardness increased from 236HV to 518HV, and yield strength increased from 547.3MPa to 740.7MPa; (3) based on the EBSD results, the enhanced hardness and yield strength were caused by refinement hardening and dislocation hardening for the SP samples. In addition, it should be noted that the SP decreased the elongation of 3D printed 316L stainless steel up to 9%, and make the ultimate tensile strength reach the maximum value of 871.2MPa at 0.2MPa SP strength.This article is protected by copyright. All rights reserved.

» Author: Haijun Pan, Wenyu Tao, Bin Zhang, Peng Jiang, Zhizhi Wang, Wangping Wu, Lin Liu, Jing Li, Zhiqiang Wu, Zhihui Cai

» Publication Date: 28/01/2023

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