The Effect of Severe Shot Peening on Fatigue Life of Laser Powder Bed Fusion Manufactured 316L Stainless Steel

Timo Rautio, Matias Jaskari, Tejas Gundgire, Terho Iso-Junno, Minnamari Vippola, Antti Järvenpää

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Abstract

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.

Original languageEnglish
Article number3517
Number of pages13
JournalMaterials
Volume15
Issue number10
DOIs
Publication statusPublished - May 2022
Publication typeA1 Journal article-refereed

Keywords

  • 316L
  • bending fatigue
  • laser powder bed fusion
  • severe shot peening

Publication forum classification

  • Publication forum level 1

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics

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