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Effect of Process Parameters on Defects, Melt Pool Shape, Microstructure, and Tensile Behavior of 316L Stainless Steel Produced by Selective Laser Melting
Jiang HZ(蒋华臻)1,2; Li ZY(李正阳)2; Feng T3; Wu PY3; Chen QS(陈启生)1,2; Feng YL3; Chen LF3; Hou JY(侯静宇)1,2; Xu HJ2
Source PublicationACTA METALLURGICA SINICA-ENGLISH LETTERS
2020-10-13
Pages16
ISSN1006-7191
Abstract

Previous studies have revealed that laser power and energy density are significant factors affecting the quality of parts manufactured by selective laser melting (SLM). The normalized equivalent densityE(0)* and dimensionless laser powerq*, which can be regarded as a progress on the understanding of the corresponding dimensional quantities, are adopted in this study to examine the defects, melt pool shape, and primary dendrite spacing of the SLM-manufactured 316L stainless steel, because it reflects the combined effect of process parameters and material features. It is found that the number of large defects decreases with increasingE(0)* due to enough heat input during the SLM process, but it will show an increasing trend when excessive heat input (i.e., utilizing a highE(0)*) is imported into the powder bed. Theq* plays an important role in controlling maximum temperature rising in the SLM process, and in turn, it affects the number of large defects. A largeq* value results in a low value of absolute frequency of large defects, whereas a maximum value of absolute frequency of large defects is achieved at a lowq* even ifE(0)* is very high. The density of the built parts is greater at a higherq* whenE(0)* remains constant. Increasing the melt pool depth at relatively low value ofE(0)* enhances the relative density of the parts. A narrow, deep melt pool can be easily generated at a highq* whenE(0)* is sufficiently high, but it may increase melt pool instability and cause keyhole defects. It is revealed that a lowE(0)* can lead to a high cooling rate, which results in a refined primary dendrite spacing. Relatively lowE(0)* is emphasized in selecting the process parameters for the tensile test sample fabrication. It shows that excellent tensile properties, namely ultimate tensile strength, yield strength, and elongation to failure of 773 MPa, 584 MPa, and 46%, respectively, can be achieved at a relatively lowE(0)* without heat treatment.

KeywordSelective laser melting Defects Melt pool shape Primary dendrite spacing Mechanical properties 316L stainless steel
DOI10.1007/s40195-020-01143-8
Indexed BySCI ; EI ; CSCD
Language英语
WOS IDWOS:000578860300002
WOS KeywordPOWDER-BED FUSION ; HIGH-STRENGTH ; DENSITY ; DENSIFICATION ; PERFORMANCE ; DEPENDENCE ; AUSTENITE ; MECHANISM ; DUCTILITY ; DIAGRAMS
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
Funding ProjectNational Natural Science Foundation of China[11772344] ; National Key R&D Program of China[2016YFB1100700]
Funding OrganizationNational Natural Science Foundation of China ; National Key R&D Program of China
Classification二类
Ranking1
ContributorLi, Zheng-Yang
Citation statistics
Cited Times:29[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/85376
Collection先进制造工艺力学实验室
微重力重点实验室
Affiliation1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100190, Peoples R China;
2.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China;
3.Beijing E Plus 3D Technol Co LTD, Beijing 102299, Peoples R China
Recommended Citation
GB/T 7714
Jiang HZ,Li ZY,Feng T,et al. Effect of Process Parameters on Defects, Melt Pool Shape, Microstructure, and Tensile Behavior of 316L Stainless Steel Produced by Selective Laser Melting[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2020:16.
APA Jiang HZ.,Li ZY.,Feng T.,Wu PY.,Chen QS.,...&Xu HJ.(2020).Effect of Process Parameters on Defects, Melt Pool Shape, Microstructure, and Tensile Behavior of 316L Stainless Steel Produced by Selective Laser Melting.ACTA METALLURGICA SINICA-ENGLISH LETTERS,16.
MLA Jiang HZ,et al."Effect of Process Parameters on Defects, Melt Pool Shape, Microstructure, and Tensile Behavior of 316L Stainless Steel Produced by Selective Laser Melting".ACTA METALLURGICA SINICA-ENGLISH LETTERS (2020):16.
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