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

Mario Valdez, Christopher Kozuch, Eric J. Faierson, Iwona Jasiuk

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish (US)
Pages (from-to)757-764
Number of pages8
JournalJournal of Alloys and Compounds
Volume725
DOIs
StatePublished - Jan 1 2017

    Fingerprint

Keywords

  • Additive manufacturing
  • Compression
  • Direct metal laser sintering
  • Impact
  • Mechanical properties
  • Metals
  • Micro-computed tomography
  • Powder bed fusion
  • Scanning electron microscopy
  • Super Alloy 718
  • Tension

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this