TY - JOUR
T1 - In situ detection of thermally induced porosity in additively manufactured and sintered objects
AU - Strumza, Einat
AU - Hayun, Shmuel
AU - Barzilai, Shmuel
AU - Finkelstein, Yacov
AU - Ben David, Roey
AU - Yeheskel, Ori
N1 - Publisher Copyright:
© 2019, Springer Science+Business Media, LLC, part of Springer Nature.
PY - 2019/6/15
Y1 - 2019/6/15
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85062465389&partnerID=8YFLogxK
U2 - 10.1007/s10853-019-03452-5
DO - 10.1007/s10853-019-03452-5
M3 - Article
AN - SCOPUS:85062465389
SN - 0022-2461
VL - 54
SP - 8665
EP - 8674
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 11
ER -