Investigating the Influence of Build Parameters and Porosity on Fatigue of AM IN718

Alexander Caputo, Richard W. Neu, Chaitanya Vallabh, Xiayun Zhao, Haolin Zhang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Using laser powder bed fusion additive manufacturing (L-PBF AM), a series of 10 sample walls were made, sectioned into fatigue specimens, and tested using high cycle fatigue (HCF) testing with a stress ratio of 0.1 at 538 °C. Each wall was built with a different process pedigree, or set of process parameters, both to explore the effects of different process regimes (conduction, transition, keyhole) on the porosity and microstructure of AM IN718 and to serve as a database of AM process conditions and their resultant defects. The internal porosity in the full gage regions of all fatigue specimens was characterized prior to HCF testing using X-ray computed tomography. Following fatigue testing, SEM fractography was used to identify the locations of fatigue critical flaws that led to failure. Using the data acquired in this work, the relationships between fatigue performance of IN718 at high temperature and the process conditions and associated porosity will be interpreted. These relationships could be adapted and used in a quality assurance model for L-PBF AM IN718.

Original languageEnglish
Title of host publicationProceedings of the 10th International Symposium on Superalloy 718 and Derivatives, 2023
EditorsEric A. Ott, Joel Andersson, Chantal Sudbrack, Zhongnan Bi, Kevin Bockenstedt, Ian Dempster, Michael Fahrmann, Paul Jablonski, Michael Kirka, Xingbo Liu, Daisuke Nagahama, Tim Smith, Martin Stockinger, Andrew Wessman
Pages571-591
Number of pages21
DOIs
StatePublished - 2023
Event10th International Symposium on Superalloy 718 and Derivatives, 2023 - San Diego, United States
Duration: 19 Mar 202323 Mar 2023

Publication series

NameMinerals, Metals and Materials Series
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696

Conference

Conference10th International Symposium on Superalloy 718 and Derivatives, 2023
Country/TerritoryUnited States
CitySan Diego
Period19/03/2323/03/23

Keywords

  • Additive manufacturing
  • Alloy 718
  • High-cycle fatigue
  • XCT

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