Mechanical properties and corrosion behavior of selective laser melted 316L stainless steel after different heat treatment processes

作     者：Decheng Kong Chaofang Dong Xiaoqing Ni Liang Zhang Jizheng Yao Cheng Man Xuequn Cheng Kui Xiao Xiaogang Li 

作者机构：Beijing Advanced Innovation Center for Materials Genome EngineeringKey Laboratory for Corrosion and Protection (MOE)Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Shanghai Engineering Research Center of 3D Printing MaterialsShanghai Research Institute of MaterialsShanghai 200437China School of Materials Science and EngineeringOcean University of ChinaQingdao 266100China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2019年第35卷第7期

页      面：1499-1507页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported financially by the National Key Research and Development Program of China (No. 2017YFB 0702300) the National Natural Science Foundation of China (No. 51671029) the Fundamental Research Funds for the Central Universities (No. FRF-TP-17-002B) 

主　　题：316L stainless steel Selective laser melting Heat treatment Microstructure Mechanical property Corrosion behaviour 

摘      要：Irregular grains, high interfacial stresses and anisotropic properties widely exist in 3D-printed metallic materials, and this paper investigated the effects of heat treatment on the microstructural, mechanical and corrosion properties of 316 L stainless steel fabricated by selective laser melting. Sub-grains and low-angle boundaries exist in the as-received selective laser melted(SLMed) 316 L stainless steel. After heat treatment at 1050℃, the sub-grains and low-angle boundaries changed slightly, and the stress state and strength decreased to some extent due to the decrease of dislocation density. After heat treatment at 1200℃, the grains became uniform, and the dislocation cells vanished, which led to a sharp decline in the hardness and strength. However, the ductility was improved after recrystallization heat *** passive film thickness and corrosion potential of the SLMed 316 L stainless steel decreased after heat treatment, and the pitting potential also decreased due to the accelerated transition from metastable to steady-state pitting;this accelerated transition was caused by the presence of weak passive films at the enlarged pores after heat treatment, especially for an adequate solid solution treatment.