Induced porosity in Super Alloy 718 through the laser additive manufacturing process: Microstructure and mechanical properties

JOURNAL OF ALLOYS AND COMPOUNDS

卷:725

Article

Valdez, Mario¹  Kozuch, Christopher¹  Faierson, Eric J.²  Jasiuk, Iwona¹ 

[1] Univ Illinois, Champaign, IL 61820 USA

[2] Western Illinois Univ, Quad City Mfg Lab, Macomb, IL USA

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;   

DOI  :  10.1016/j.jallcom.2017.07.198

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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