The cellular boundary with high density of dislocations governed the strengthening mechanism in selective laser melted 316L stainless steel

被引：91
作者：
Hong, Yuanjian [1 ]
Zhou, Chengshuang [1 ]
Zheng, Yuanyuan [1 ]
Zhang, Lin [1 ]
Zheng, Jinyang [2 ]
机构：
[1] Zhejiang Univ Technol, Inst Mat Forming & Control Engn, Hangzhou 310014, Peoples R China
[2] Zhejiang Univ, Inst Proc Equipment, Hangzhou 310027, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2021年 / 799卷
基金：
中国国家自然科学基金;
关键词：
Yield strength; Cellular sub-grain; Selective laser melting; Dislocation; Stainless steel; MICROSTRUCTURE; DEFORMATION; BEHAVIOR; MARTENSITE; PLASTICITY; AUSTENITE; DUCTILITY; HARDNESS; NETWORK; STRESS;
D O I：
10.1016/j.msea.2020.140279
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The cellular sub-grain was widely reported as the main contributor to the high yield strength of selective laser melted stainless steels, but its underlying strengthening mechanism was still unclear. In this study, the high yield strength of selective laser melted 316L stainless steel was studied by manipulating the cellular sub-grain through various heat treatments. Although the cellular sub-grain still existed in the heat-treated samples, the yield strength decreases significantly after heat treatment. This study firstly demonstrated that the high density of dislocations at the cellular boundary played a key role in the interfacial strengthening effect. Despite the small misorientation between the neighbouring cellular sub-grain, the cellular boundary acted as the high-angle grain boundary during deformation. The dislocation network consisted of the cellular boundaries provided a high density of interfaces that significantly inhibited the dislocation motion, resulting in higher yield strength.
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页数：9
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