Influences of horizontal and vertical build orientations and post-fabrication processes on the fatigue behavior of stainless steel 316L produced by selective laser melting

Wood, P., Libura, T., Kowalewski, Z.L., Williams, G. and Serjouei, A. ORCID: 0000-0002-7250-4131, 2019. Influences of horizontal and vertical build orientations and post-fabrication processes on the fatigue behavior of stainless steel 316L produced by selective laser melting. Materials, 12 (24): 4203. ISSN 1996-1944

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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.

Item Type: Journal article
Publication Title: Materials
Creators: Wood, P., Libura, T., Kowalewski, Z.L., Williams, G. and Serjouei, A.
Publisher: MDPI
Date: 14 December 2019
Volume: 12
Number: 24
ISSN: 1996-1944
Identifiers:
NumberType
10.3390/ma12244203DOI
1258901Other
Rights: All articles published by MDPI are made immediately available worldwide under an open access license. This means: everyone has free and unlimited access to the full-text of all articles published in MDPI journals; everyone is free to re-use the published material if proper accreditation/citation of the original publication is given; open access publication is supported by the authors' institutes or research funding agencies by payment of a comparatively low Article Processing Charge (APC) for accepted articles.
Divisions: Schools > School of Science and Technology
Record created by: Jonathan Gallacher
Date Added: 16 Jan 2020 09:43
Last Modified: 16 Jan 2020 09:45
URI: http://irep.ntu.ac.uk/id/eprint/38982

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