论文摘要
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 treatment.The 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.
论文目录
文章来源
类型: 期刊论文
作者: Decheng Kong,Chaofang Dong,Xiaoqing Ni,Liang Zhang,Jizheng Yao,Cheng Man,Xuequn Cheng,Kui Xiao,Xiaogang Li
来源: Journal of Materials Science & Technology 2019年07期
年度: 2019
分类: 工程科技Ⅰ辑
专业: 金属学及金属工艺
单位: Beijing Advanced Innovation Center for Materials Genome Engineering, Key Laboratory for Corrosion and Protection (MOE), Institute for Advanced Materials and Technology, University of Science and Technology Beijing,Shanghai Engineering Research Center of Printing Materials, Shanghai Research Institute of Materials,School of Materials Science and Engineering, Ocean University of China
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)
分类号: TG142.71;TG665;TG156
页码: 1499-1507
总页数: 9
文件大小: 2724K
下载量: 54