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Microstructure and fatigue behavior of laser-powder bed fusion austenitic stainless steel
Yu, Chenfan1; Zhang, Peng2; Zhang, Zhefeng2; Liu, Wei1
Corresponding AuthorLiu, Wei(Liuw_tsinghua@163.com)
2020-06-01
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume46Pages:191-200
AbstractThe 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.
KeywordLaser-powder bed fusion Austenitic stainless steel Microstructures Fatigue crack
Funding OrganizationNational Magnetic Confinement Fusion Science Program of China ; National Natural Science Foundation of China
DOI10.1016/j.jmst.2019.08.047
Indexed BySCI
Language英语
Funding ProjectNational Magnetic Confinement Fusion Science Program of China[2014GB117000] ; National Natural Science Foundation of China[U1605243]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000525326000021
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/138366
Collection中国科学院金属研究所
Corresponding AuthorLiu, Wei
Affiliation1.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
Recommended Citation
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.
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