Neutron diffraction residual stress determinations in Fe3Al based iron aluminide components fabricated using wire-arc additive manufacturing (WAAM)

Chen Shen, Mark Reid, Klaus Dieter Liss, Zengxi Pan*, Yan Ma, Dominic Cuiuri, Stephen van Duin, Huijun Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The Wire-Arc Additive Manufacturing (WAAM) process is an increasingly attractive method for producing porosity-free metal components. However, the residual stresses and distortions resulting from the WAAM process are major concerns as they not only influence the part tolerance but can also cause premature failure in the final component during service. The current paper presents a method for using neutron diffraction to measure residual stresses in Fe3Al intermetallic wall components that have been in-situ additively fabricated using the WAAM process with different post-production treatments. By using averaging methods during the experimental setup and data processing, more reliable residual stress results are obtained from the acquired neutron diffraction data. In addition, the present study indicates that the normal residual stresses are significant compared to normal butt/fillet welding samples, which is caused by the large temperature gradient in this direction during the additive layer depositions.

Original languageEnglish
Article number100774
JournalAdditive Manufacturing
Volume29
DOIs
StatePublished - Oct 2019

Keywords

  • Additive manufacturing
  • Heat treatment
  • Iron aluminide
  • Neutron diffraction
  • Residual stress

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