Influences of horizontal and vertical build orientations and post-fabrication processes on the fatigue behavior of stainless steel 316l produced by selective laser melting
Journal article
Authors | Wood, Paul, Libura, Tomasz, Kowalewski, Zbigniew L., Williams, Gavin and Serjouei, Ahmad |
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Abstract | In this paper, the influences of build orientation and post-fabrication processes, including stress-relief, machining, and shot-peening, on the fatigue behavior of stainless steel (SS) 316L manufactured using selective laser melting (SLM) are studied. It was found that horizontally-built (XY) and machined (M) test pieces, which had not been previously studied in the literature, in both stress-relieved (SR) or non-stress-relieved (NSR) conditions show superior fatigue behavior compared to vertically-built (ZX) and conventionally-manufactured SS 316L. The XY, M, and SR (XY-M-SR) test pieces displayed fatigue behavior similar to the XY-M-NSR test pieces, implying that SR does not have a considerable effect on the fatigue behavior of XY and M test pieces. ZX-M-SR test pieces, due to their considerably lower ductility, exhibited significantly larger scatter and a lower fatigue strength compared to ZX-M-NSR samples. Shot-peening (SP) displayed a positive effect on improving the fatigue behavior of the ZX-NSR test pieces due to a compressive stress of 58 MPa induced on the surface of the test pieces. Fractography of the tensile and fatigue test pieces revealed a deeper understanding of the relationships between the process parameters, microstructure, and mechanical properties for SS 316L produced by laser systems. For example, fish-eye fracture pattern or spherical stair features were not previously observed or explained for cyclically-loaded SLM-printed parts in the literature. This study provides comprehensive insight into the anisotropy of the static and fatigue properties of SLM-printed parts, as well as the pre- and post-fabrication parameters that can be employed to improve the fatigue behavior of steel alloys manufactured using laser systems. |
Keywords | General Materials Science |
Year | 2019 |
Journal | Materials |
Journal citation | 12 (24), p. 4203 |
Publisher | MDPI AG |
ISSN | 1996-1944 |
Digital Object Identifier (DOI) | https://doi.org/10.3390/ma12244203 |
Web address (URL) | http://hdl.handle.net/10545/624589 |
https://creativecommons.org/licenses/by/4.0/ | |
hdl:10545/624589 | |
Publication dates | 14 Dec 2019 |
Publication process dates | |
Deposited | 13 Mar 2020, 09:35 |
Accepted | 10 Dec 2019 |
Contributors | University of Derby, The Polish Academy of Sciences and Nottingham Trent University |
File | File Access Level Open |
https://repository.derby.ac.uk/item/93004/influences-of-horizontal-and-vertical-build-orientations-and-post-fabrication-processes-on-the-fatigue-behavior-of-stainless-steel-316l-produced-by-selective-laser-melting
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