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Effect of post processing on the creep performance of laser powder bed fused Inconel 718

Xu, Z.; Murray, J.W.; Hyde, C.J.; Clare, A.T.

Authors

Z. Xu

J.W. Murray

A.T. Clare



Abstract

In this study, the creep performance of laser powder bed fusion manufactured Inconel 718 specimens is studied in detail and compared with conventional hot-rolled specimens alongside as-built then heat-treated and as-built then hot-isostatic pressed specimens. Hot-rolled specimens showed the best creep resistance, while the hot-isostatic pressed specimens yielded the worst performance, inferior to the as-built condition. Creep testing of all samples showed increased secondary creep rate was consistently correlated with a reduced life. Fractography revealed intergranular fracture was the primary failure mode for all as-built samples. Preferential intergranular precipitation in the case of the hot-isostatic pressed specimens during hot-isostatic pressing extensive intergranular cracking as the primary failure mechanism. Heat-treated specimens possessed only sparse intergranular precipitates, thereby explaining an improved creep lifetime. The hot-rolled specimens, having smallest grain size, showed the least extensive cracking, particularly in locations of finest grains, explaining avoidance of intergranular fracture as a key creep mechanism, thereby explaining the ductile creep fracture surfaces in the case of the hot-rolled samples.

Journal Article Type Article
Publication Date Dec 1, 2018
Journal Additive Manufacturing
Print ISSN 2214-7810
Electronic ISSN 2214-8604
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 24
Pages 486-497
APA6 Citation Xu, Z., Murray, J., Hyde, C., & Clare, A. (2018). Effect of post processing on the creep performance of laser powder bed fused Inconel 718. Additive Manufacturing, 24, 486-497. doi:10.1016/j.addma.2018.10.027
DOI https://doi.org/10.1016/j.addma.2018.10.027
Keywords Creep; Laser powder bed fusion; Inconel 718; Heat treatment; Hot-isostatic pressing
Publisher URL https://www.sciencedirect.com/science/article/pii/S2214860418305578?dgcid=author
Additional Information This article is maintained by: Elsevier; Article Title: Effect of post processing on the creep performance of laser powder bed fused Inconel 718; Journal Title: Additive Manufacturing; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.addma.2018.10.027; Content Type: article; Copyright: © 2018 Elsevier B.V. All rights reserved.

A.T. Clare also based at Department of Mechanical, Materials and Manufacturing Engineering, Faculty of Science and Engineering, University of Nottingham China, Ningbo

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