Z. Xu
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
JAMES MURRAY James.Murray@nottingham.ac.uk
Senior Research Fellow
Dr CHRISTOPHER HYDE Christopher.Hyde@nottingham.ac.uk
Associate Professor
ADAM CLARE adam.clare@nottingham.ac.uk
Professor of Manufacturing Engineering
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.
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. https://doi.org/10.1016/j.addma.2018.10.027
Journal Article Type | Article |
---|---|
Acceptance Date | Oct 18, 2018 |
Online Publication Date | Oct 22, 2018 |
Publication Date | Dec 1, 2018 |
Deposit Date | Oct 29, 2018 |
Publicly Available Date | Oct 23, 2019 |
Journal | Additive Manufacturing |
Print ISSN | 2214-7810 |
Electronic ISSN | 2214-8604 |
Publisher | Elsevier |
Peer Reviewed | Peer Reviewed |
Volume | 24 |
Pages | 486-497 |
DOI | https://doi.org/10.1016/j.addma.2018.10.027 |
Keywords | Creep; Laser powder bed fusion; Inconel 718; Heat treatment; Hot-isostatic pressing |
Public URL | https://nottingham-repository.worktribe.com/output/1206221 |
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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