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Correlation Between Microstructure and Tensile Properties of STS 316L and Inconel 718 Fabricated by Selective Laser Melting (SLM)

Authors
Lee, JungsubLee, MinshikJung, Im DooChoe, JunghoYu, Ji-HunKim, SangshikSung, Hyokyung
Issue Date
Nov-2020
Publisher
AMER SCIENTIFIC PUBLISHERS
Keywords
Selective Laser Melting; STS 316L; Inconel 718; Tensile Properties
Citation
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.20, no.11, pp 6807 - 6814
Pages
8
Indexed
SCIE
Journal Title
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume
20
Number
11
Start Page
6807
End Page
6814
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/5966
DOI
10.1166/jnn.2020.18792
ISSN
1533-4880
1533-4899
Abstract
The correlation between microstructure and tensile properties of selective laser melting (SLM) processed STS 316L and Inconel 718 were investigated at various heights (top, middle and bottom) and planes (YZ, ZX and XY). Columnar grains and dendrites were formed by directional growth during solidification. The average melt pool width and depth, and scan track width were similar in both specimens due to fixed processing parameters. SLM Inconel 718 has moderate tensile strength (1165 MPa) and tensile elongation (11.5%), whereas SLM STS 316L has outstanding tensile strength (656 MPa) and tensile elongation (75%) compared to other SLM processed STS 316L. Fine columnar diameter (0.5 mu m) and dense microstructures (porosity: 0.35%) in SLM STS 316L promoted the enhancement of tensile elongation by suitable processing condition. Fractographic analysis suggested that the lack of fusion pore with unmelted powder should be avoided to increase tensile properties by controlling processing parameters.
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대학원 (나노신소재융합공학과)
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