期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 725, 期 -, 页码 757-764出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.07.198
关键词
Additive manufacturing; Metals; Direct metal laser sintering; Powder bed fusion; Super Alloy 718; Mechanical properties; Scanning electron microscopy; Micro-computed tomography; Tension; Compression; Impact
资金
- National Science Foundation (NSF) I/UCRC [IIP-1362146]
- Div Of Industrial Innovation & Partnersh
- Directorate For Engineering [1362146] Funding Source: National Science Foundation
This paper addresses characterization of Super Alloy (Inconel) 718 manufactured through the powder bed fusion (PBF) process. Specimens were fabricated using five different sets of process parameters to induce a range of porosities within the samples. Scanning electron microscopy and micro-computed tomography methods were used to characterize microstructures of these specimens, and mechanical properties were measured using tension, compression, and impact tests. Energy absorption proved to be highly sensitive to density, and stress-strain curves from compression testing were found to behave much like open-cell foams in the presence of high porosity. The similarities with open-cell foams were confirmed with scanning electron microscopy images. Micro-computed tomography scans indicated that the induced porosity was continuous throughout the specimens. (C) 2017 Elsevier B.V. All rights reserved.
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