University of Oulu

Rautio T, Jaskari M, Gundgire T, Iso-Junno T, Vippola M, Järvenpää A. The Effect of Severe Shot Peening on Fatigue Life of Laser Powder Bed Fusion Manufactured 316L Stainless Steel. Materials. 2022; 15(10):3517.

The effect of severe shot peening on fatigue life of laser powder bed fusion manufactured 316L stainless steel

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Author: Rautio, Timo1; Jaskari, Matias1; Gundgire, Tejas2;
Organizations: 1Kerttu Saalasti Institute, University of Oulu, Pajatie 5, 85500 Nivala, Finland
2Materials Science and Environmental Engineering, Tampere University, 33014 Tampere, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.5 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2022
Publish Date: 2022-09-05


Severe shot peening (SSP) was used on additive manufactured 316L by laser powder bed fusion. The effect of the post processing on the surface features of the material was analyzed through residual stress measurements, tensile testing, hardness-depth profiles, and fatigue testing by flexural bending. The results showed that SSP can be utilized to form residual stresses up to −400 MPa 200 μm below the surface. At the same time, a clear improvement on the surface hardness was achieved from 275 HV to near 650 HV. These together resulted in a clear improvement on material strength which was recorded at 10% improvement in ultimate tensile strength. Most significantly, the fatigue limit of the material was tripled from 200 MPa to over 600 MPa and the overall fatigue strength raised similarly from a low to high cycle regime.

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Series: Materials
ISSN: 1996-1944
ISSN-E: 1996-1944
ISSN-L: 1996-1944
Volume: 15
Issue: 10
Article number: 3517
DOI: 10.3390/ma15103517
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: This research was funded by the European Union (European Regional Development Fund, Council of Oulu Region) for the “Hybridi” Grant Nos. A73071 and “M3D” Grant No. A77901, and by Association of Finnish Steel and Metal Producers, Grant No. 750.
Copyright information: © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (