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.
Dr CHRISTOPHER HYDE Christopher.Hyde@nottingham.ac.uk
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|
|Peer Reviewed||Peer Reviewed|
|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|
|Keywords||Creep; Laser powder bed fusion; Inconel 718; Heat treatment; Hot-isostatic pressing|
|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
Effect of post processing
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