Residual Stress Evaluation in Selective-Laser-Melting Additively Manufactured Titanium (Ti-6Al-4V) and Inconel 718 using the Contour Method and Numerical Simulation

Bilal Ahmed, Sjoerd van der Veen, Michael Fitzpatrick, Hua Guo

Research output: Contribution to journalArticle

30 Citations (Scopus)
216 Downloads (Pure)

Abstract

Residual stresses play an important role for the structural integrity of engineering components. In this study residual stresses were determined in titanium alloy (Ti-6Al-4 V) and Inconel 718 samples produced using selective-laser-melting (SLM) additive manufacturing. The contour method and a numerical simulation approach (inherent-strain-based method) were used to determine the residual stress distributions. The inherent-strain-based method reduces the computational time compared to weakly-coupled thermo-mechanical simulations. Results showed the presence of high tensile residual stresses at and near the surface of both titanium and Inconel alloys samples, whereas compressive residual stresses were seen at the center region. A good agreement was seen between the results obtained from contour method and the numerical simulation, particularly 1 mm below the surface of the samples.
Original languageEnglish
Pages (from-to)571-582
Number of pages12
JournalAdditive Manufacturing
Volume22
Early online date8 Jun 2018
DOIs
Publication statusPublished - Aug 2018

Keywords

  • Selective laser melting
  • contour method
  • inherent strain-based method
  • residual stress
  • additive manufacturing

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