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Journal of Materials Science

, Volume 54, Issue 11, pp 8665–8674 | Cite as

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

  • Einat Strumza
  • Shmuel HayunEmail author
  • Shmuel Barzilai
  • Yacov Finkelstein
  • Roey Ben David
  • Ori YeheskelEmail author
Metals

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.

Notes

Acknowledgements

The authors thank Ms. Nataly Kosterya (NRCN) for running the TPD measurements and Mr. David Noyman (NRCN) for his technical assistance. Special thanks are extended to Dr. Ofer Tevet and Dr. Eitan Tiferet (NRCN) for helpful discussions. This study was undertaken under the auspice of Project #2022851 from the Israeli Ministry of Space and Technology.

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Materials EngineeringBen-Gurion University of the NegevBeer-ShevaIsrael
  2. 2.Nuclear Research Center of the Negev (NRCN)Beer-ShevaIsrael
  3. 3.Israel Atomic Energy CommissionTel AvivIsrael

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