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Journal of Materials Science

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26-02-2019 | Metals

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

Published in: Journal of Materials Science | Issue 11/2019

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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.

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Title: In situ detection of thermally induced porosity in additively manufactured and sintered objects
Publication date: 26-02-2019
Published in: Journal of Materials Science / Issue 11/2019
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-019-03452-5

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