Microstructure and fatigue behavior of laser-powder bed fusion austenitic stainless steel

doi:10.1016/j.jmst.2019.08.047

IMR OpenIR

	Microstructure and fatigue behavior of laser-powder bed fusion austenitic stainless steel
	Yu, Chenfan 1; Zhang, Peng 2; Zhang, Zhefeng 2; Liu, Wei 1
通讯作者	Liu, Wei(Liuw_tsinghua@163.com)
	2020-06-01
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	46 页码:191-200
摘要	The microstructures and stress-controlled fatigue behavior of austenitic stainless steel (AISI 316 L stainless steel) fabricated via laser-powder bed fusion (L-PBF) technique were investigated. For L-PBF process, zigzag laser scanning strategy (scan rotation between successive layer was 0 degrees, ZZ sample) and cross-hatching layer scanning strategy (scan rotation between successive layer was 67 degrees, CH sample) were employed. By inducing different thermal history, it is found that the scan strategies of laser beam have a significant impact on grain size and morphology. Fatigue cracks generally initiated from persistent slip bands (PSBs) or grain boundaries (GBs). It is observed that PSBs could transfer the melt pool boundaries (MPBs) continuously. The MPBs have better strain compatibility compared with grain boundaries (GBs), thus MPBs would not be the initiation site of fatigue cracks. A higher fatigue limit strength could be achieved by employing a crosshatching scanning strategy. For the CH sample, fatigue cracks also initiated from GBs and PSBs. However, fatigue crack initiated from process-induced defects were observed in ZZ sample in high-cycle regions. Solidification microstructures and defects characteristics are important factors affecting the fatigue performance of L-PBF 316 L stainless. Process-induced defects originated from fluid instability can be effectively reduced by adjusting the laser scan strategy. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
关键词	Laser-powder bed fusion Austenitic stainless steel Microstructures Fatigue crack
资助者	National Magnetic Confinement Fusion Science Program of China ; National Natural Science Foundation of China
DOI	10.1016/j.jmst.2019.08.047
收录类别	SCI
语种	英语
资助项目	National Magnetic Confinement Fusion Science Program of China[2014GB117000] ; National Natural Science Foundation of China[U1605243]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000525326000021
出版者	JOURNAL MATER SCI TECHNOL
引用统计	被引频次：22[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/138368
专题	中国科学院金属研究所
通讯作者	Liu, Wei
作者单位	1.Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Lab Fatigue & Fracture Mat, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Yu, Chenfan,Zhang, Peng,Zhang, Zhefeng,et al. Microstructure and fatigue behavior of laser-powder bed fusion austenitic stainless steel[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2020,46:191-200.
APA	Yu, Chenfan,Zhang, Peng,Zhang, Zhefeng,&Liu, Wei.(2020).Microstructure and fatigue behavior of laser-powder bed fusion austenitic stainless steel.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,46,191-200.
MLA	Yu, Chenfan,et al."Microstructure and fatigue behavior of laser-powder bed fusion austenitic stainless steel".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 46(2020):191-200.