In situ detection of thermally induced porosity in additively manufactured and sintered objects

Einat Strumza, Shmuel Hayun, Shmuel Barzilai, Yacov Finkelstein, Roey Ben David, Ori Yeheskel

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Dilatation measurements, combined with thermal programmed desorption mass spectrometry (TPD-MS), were utilized for studying thermally induced porosity (TIP) in selective laser melting additively manufactured (AM) AlSi10Mg and Ta30at.%–Ti samples produced by hot isostatic pressing (HIP). A clear abrupt upward deviation in thermal expansion is observed, most probably indicating the occurrence of TIP mechanisms in both AM objects and powder metallurgy samples. For both AlSi10Mg and Ta30at.%–Ti, pores are clearly observed by either microscopic or macroscopic examinations. The TPD-MS analysis shows that both water and hydrogen evolve from AlSi10Mg powder particles, thus suggesting that thermally induced expansion of trapped hydrogen in HIP’ed Ta30at.%–Ti alloy and in laser powder bed fusion AlSi10Mg is the main source for the pressure increase in pores that consequently leads to permanent expansion upon heating. A simplified model that correlates the pressure inside the pores with the weakening of the material upon heating and TIP is proposed.

Original languageEnglish
Pages (from-to)8665-8674
Number of pages10
JournalJournal of Materials Science
Volume54
Issue number11
DOIs
StatePublished - 15 Jun 2019

ASJC Scopus subject areas

  • Materials Science (all)
  • Mechanics of Materials
  • Mechanical Engineering

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