Effect of Process Parameters and High-Temperature Preheating on Residual Stress and Relative Density of Ti6Al4V Processed by Selective Laser Melting

Martin Malý, Christian Höller, Mateusz Skalon, Benjamin Meier, Daniel Koutný , Rudolf Pichler, Christoph Sommitsch, David Paloušek

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The aim of this study is to observe the effect of process parameters on residual stresses and relative density of Ti6Al4V samples produced by Selective Laser Melting. The investigated parameters were hatch laser power, hatch laser velocity, border laser velocity, high-temperature preheating and time delay. Residual stresses were evaluated by the bridge curvature method and
relative density by the optical method. The effect of the observed process parameters was estimated by the design of experiment and surface response methods. It was found that for an effective residual stress reduction, the high preheating temperature was the most significant parameter. High preheating temperature also increased the relative density but caused changes in the chemical composition of Ti6Al4V unmelted powder. Chemical analysis proved that after one build job with high preheating temperature, oxygen and hydrogen content exceeded the ASTM B348 limits for Grade 5 titanium.
Original languageEnglish
Article number930
Number of pages13
JournalMaterials
Volume12
Issue number6
DOIs
Publication statusPublished - 20 Mar 2019

Keywords

  • Selective Laser Melting
  • Ti6Al4V
  • residual stress
  • deformation
  • preheating
  • relative density
  • powder degradation
  • Deformation
  • Powder degradation
  • Relative density
  • Selective laser melting
  • Preheating
  • Residual stress

ASJC Scopus subject areas

  • Materials Science(all)

Fields of Expertise

  • Advanced Materials Science

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