In-situ observation of asymmetrical deformation around inclusion in a heterogeneous additively manufactured 316L stainless steel

Decheng Kong ¹Chaofang Dong ²Xiaoqing Ni ³Zhang Liang ³Xiaogang Li²

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作者信息

1. Beijing Advanced Innovation Center for Materials Genome Engineering,Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing,100083,China;Department of Materials Science and Engineering,Massachusetts Institute of Technology,Cambridge,MA,02139,USA
2. Beijing Advanced Innovation Center for Materials Genome Engineering,Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing,100083,China
3. Shanghai Engineering Research Center of 3D Printing Materials,Shanghai Research Institute of Materials,Shanghai,200437,China
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Abstract

Oxide inclusions widely exist in additively manufactured components due to the native oxide layer on the powder surface,together with gas impurities during the printing process.Using in-situ tensile tests combined with electron backscatter diffraction (EBSD) and electron channeling contrast imaging (ECCI)techniques,we propose an asymmetrical cracking mechanism around the oxide inclusions in a selec-tive laser melted 316L stainless steel.The heterogeneous sub-micro cellular structures lead to different twinning tendencies around the inclusions due to the size-related critical twinning stresses,and the deformation-induced nano-twin clusters can resist the cracking propagation,therefore resulting in the asymmetrical cracking behaviors around the inclusions.

Key words

Selective laser melting/316L stainless steel/Oxide inclusion/Asymmetrical crack/Cellular structure

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基金项目

National Key Research and Development Program of China(2017YFB0702300)

National Natural Science Foundation of China(51871028)

Fundamental Research Funds for the Central Universities(FRF-TP-19-003B2)

Decheng Kong is deeply indebted to the China Scholarship Council for financial support()

出版年

2021

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量37

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