The Effect of Severe Shot Peening on Fatigue Life of Laser Powder Bed Fusion Manufactured 316L Stainless Steel
Rautio, Timo; Jaskari, Matias; Gundgire, Tejas; Iso-Junno, Terho; Vippola, Minnamari; Järvenpää, Antti (2022-05)
Rautio, Timo
Jaskari, Matias
Gundgire, Tejas
Iso-Junno, Terho
Vippola, Minnamari
Järvenpää, Antti
05 / 2022
3517
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-202206085567
https://urn.fi/URN:NBN:fi:tuni-202206085567
Kuvaus
Peer reviewed
Tiivistelmä
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.
Kokoelmat
- TUNICRIS-julkaisut [16929]