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

doi:10.3390/ma15103517

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

Materials Science and Environmental Engineering

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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 language	English
Article number	3517
Number of pages	13
Journal	Materials
Volume	15
Issue number	10
DOIs	https://doi.org/10.3390/ma15103517
Publication status	Published - May 2022
Publication type	A1 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

Materials Science(all)
Condensed Matter Physics

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10.3390/ma15103517Licence: CC BY

materials-15-03517Final published version, 1.46 MBLicence: CC BY

https://urn.fi/URN:NBN:fi:tuni-202206085567Licence: CC BY

Cite this

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

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.",

keywords = "316L, bending fatigue, laser powder bed fusion, severe shot peening",

author = "Timo Rautio and Matias Jaskari and Tejas Gundgire and Terho Iso-Junno and Minnamari Vippola and Antti J{\"a}rvenp{\"a}{\"a}",

note = "Funding Information: 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. Publisher Copyright: {\textcopyright} 2022 by the authors. Licensee MDPI, Basel, Switzerland.",

year = "2022",

month = may,

doi = "10.3390/ma15103517",

language = "English",

volume = "15",

journal = "Materials",

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T1 - The Effect of Severe Shot Peening on Fatigue Life of Laser Powder Bed Fusion Manufactured 316L Stainless Steel

AU - Rautio, Timo

AU - Jaskari, Matias

AU - Gundgire, Tejas

AU - Iso-Junno, Terho

AU - Vippola, Minnamari

AU - Järvenpää, Antti

N1 - Funding Information: 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. Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2022/5

Y1 - 2022/5

N2 - 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.

AB - 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.

KW - 316L

KW - bending fatigue

KW - laser powder bed fusion

KW - severe shot peening

U2 - 10.3390/ma15103517

DO - 10.3390/ma15103517

M3 - Article

AN - SCOPUS:85130549402

SN - 1996-1944

VL - 15

JO - Materials

JF - Materials

IS - 10

M1 - 3517

ER -

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

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