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

被引：27

作者：

Strumza, Einat ^{[1
]}

Hayun, Shmuel ^{[1
]}

Barzilai, Shmuel ^{[2
]}

Finkelstein, Yacov ^{[2
]}

Ben David, Roey ^{[3
]}

Yeheskel, Ori ^{[1
]}

机构：

[1] Ben Gurion Univ Negev, Dept Mat Engn, POB 653, IL-84105 Beer Sheva, Israel

[2] NRCN, POB 9001, IL-84109 Beer Sheva, Israel

[3] Israel Atom Energy Commiss, POB 7061, IL-61070 Tel Aviv, Israel

来源：

JOURNAL OF MATERIALS SCIENCE | 2019年 / 54卷 / 11期

关键词：

TEMPERATURE-PROGRAMMED DESORPTION; MECHANICAL-PROPERTIES; LASER; MICROSTRUCTURE; TI-6AL-4V; REDUCTION; FATIGUE; GROWTH; PORES; OXIDE;

D O I：

10.1007/s10853-019-03452-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：8665 / 8674

页数：10

共 45 条

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