Comparative investigation of small punch creep resistance of Inconel 718 fabricated by selective laser melting

Creep performance of selective laser melting (SLM) fabricated Inconel 718 is studied in comparison with that of as-forged and as-cast Inconel 718 via small punch creep test technique. The results show that the SLM-fabricated samples have a time to rupture approximately equal to that of the as-forged...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2019-02, Vol.745, p.31-38
Main Authors: Wang, L.Y., Zhou, Z.J., Li, C.P., Chen, G.F., Zhang, G.P.
Format: Article
Language:English
Subjects:
Additive manufacturing
Creep strength
Creep tests
Fracture mechanics
Grain boundaries
Inconel 718
Intergranular fracture
Laser beam melting
Laves phase
Nickel base alloys
Rapid prototyping
Selective laser melting
Small punch creep test
Superalloys
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Summary:Creep performance of selective laser melting (SLM) fabricated Inconel 718 is studied in comparison with that of as-forged and as-cast Inconel 718 via small punch creep test technique. The results show that the SLM-fabricated samples have a time to rupture approximately equal to that of the as-forged samples but much less than the as-cast sample due to the difference in the microstructures introduced by these manufacture processes. Intergranular fracture occurred in all the samples. For the SLM-fabricated Inconel 718, cracks initiated from the brittle Laves phases at grain boundaries during the creep process and may speed up the creep and lead to the failure of the sample. “Track-track” melt pool boundaries as one of the important interfaces in SLM-fabricated material can lead to a change in the cracking direction.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2018.12.083