Microstructure and tensile properties of selective laser melting forming 316L stainless steel

doi:10.12073/j.hjxb.2018390205

	Microstructure and tensile properties of selective laser melting forming 316L stainless steel
	Yin, Yan 1; Liu, Pengyu 1; Lu, Chao 2; Xiao, Mengzhi 1,3; Zhang, Ruihua 2,3
刊名	Hanjie Xuebao/Transactions of the China Welding Institution
	2018-08-25
卷号	39 期号:8 页码:77-81
关键词	Austenitic stainless steel Crystal structure Grain growth Melting Microstructure Stainless steel Tensile properties Tensile strength Tensile testing 316 L stainless steel Columnar crystals Comprehensive performance Growth directions Melting and solidification Microstructure characteristics Scanning strategies Tensile mechanical properties
ISSN号	0253360X
DOI	10.12073/j.hjxb.2018390205
英文摘要	The selective laser melting technology shows great advantages in the field of manufacturing of complex parts, but the organization and the comprehensive performance of the specimens have yet to be further optimized. Specimens of 316L stainless steel were fabricated by selective laser melting technology, the microstructure characteristics of different regions were analyzed, the tensile mechanical properties were tested. The results showed that the micro-structure were mainly cell crystal. However, the grain growth direction were different in some "micro-melting pools", and almost perpendicular to each other, which showed a small typical columnar crystal in the same field of view (subgrain) and "hexagonal cellular crystal" coexistence of micro-structure characteristics. Compared with the traditional specimens, the tensile strength of had greatly improved, but the elongation decreased. This was mainly due to the fact that SLM was a process of rapid melting and solidification which maked the difference of laser incident angle, scanning strategy and heat dissipation conditions resulting in complex crystals at different regions and different microstructure. The fine columnar crystal formed by rapid cooling that was submicron order and densely distribute was the main reason of the increases in tensile strength. However, the obvious anisotropy of grain, which resulted in the uneven deformation of grain in different directions and restrained mutually during the tensile test, and the inevitable remarkable internal stress at the interface of fusion lines leaded to a decrease in elongation. © 2018, Editorial Board of Transactions of the China Welding Institution, Magazine Agency Welding. All right reserved.
语种	中文
出版者	Harbin Research Institute of Welding
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/114829]
专题	材料科学与工程学院
作者单位	1.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China; 2.China Iron & Steel Research Institute Group, Beijing; 100081, China; 3.Hardware Knife Cut Industrial Technology Research Institute Yangjiang, Yangjiang; 529533, China
推荐引用方式 GB/T 7714	Yin, Yan,Liu, Pengyu,Lu, Chao,et al. Microstructure and tensile properties of selective laser melting forming 316L stainless steel[J]. Hanjie Xuebao/Transactions of the China Welding Institution,2018,39(8):77-81.
APA	Yin, Yan,Liu, Pengyu,Lu, Chao,Xiao, Mengzhi,&Zhang, Ruihua.(2018).Microstructure and tensile properties of selective laser melting forming 316L stainless steel.Hanjie Xuebao/Transactions of the China Welding Institution,39(8),77-81.
MLA	Yin, Yan,et al."Microstructure and tensile properties of selective laser melting forming 316L stainless steel".Hanjie Xuebao/Transactions of the China Welding Institution 39.8(2018):77-81.