The Effect of Severe Shot Peening on Fatigue Life of Laser Powder Bed Fusion Manufactured 316L Stainless Steel
Abstract
:1. Introduction
2. Materials and Methods
2.1. Material and LPBF Manufacturing
2.2. Shot Peening
2.3. Residual Stress and Roughness Measurements
2.4. Characterization of Static and Dynamic Properties
3. Results
3.1. Tensile Strength
3.2. Hardness
3.3. Residual Stresses
3.4. Bending Fatigue
4. Discussion
5. Conclusions
- SSP induced beneficial larger compressive residual stresses of more than 700 MPa at 100 μm depth along with reduced surface roughness;
- Increased mechanical strength was achieved with the SSP leading to an ultimate tensile strength increase of 10%;
- Hardness-depth profile measurements revealed a maximum hardness of nearly 650 HV at the surface after the SSP compared to 275 HV of as built material at the depth of 0.4 mm;
- Bending fatigue performance of the material was notably increased with the fatigue limit recorded at 600 MPa after the SSP compared to the 200 of as built material.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
Abbreviations
AM | Additive Manufacturing |
BF | Bending Fatigue |
LPBF | Laser Powder Bed Fusion |
SP | Shot Peening |
SSP | Severe Shot Peening |
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Fe | Ni | Cr | Mn | Mo | C | Si | Cu | N | O | S | P |
---|---|---|---|---|---|---|---|---|---|---|---|
Balance | 12.5 | 17.6 | 0.66 | 2.38 | 0.02 | 0.65 | 0.02 | 0.09 | 0.03 | 0.006 | 0.007 |
YS 0.2% [MPa] | YS 0.5% [MPa] | YS 1% [MPa] | UTS [MPa] | Elongation at Break [%] | |
---|---|---|---|---|---|
As built | 488 ± 2.2 | 520 ± 2.3 | 533 ± 2.3 | 615 ± 1.4 | 39.3 ± 0.2 |
HT | 468 ± 2.1 | 496 ± 2.2 | 503 ± 2.2 | 654 ± 2.0 | 42.6 ± 0.3 |
HT + SSP | 479 ± 1.2 | 535 ± 1.3 | 589 ± 1.5 | 719 ± 2.3 | 33.9 ± 0.4 |
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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, 3517. https://doi.org/10.3390/ma15103517
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. https://doi.org/10.3390/ma15103517
Chicago/Turabian StyleRautio, Timo, Matias Jaskari, Tejas Gundgire, Terho Iso-Junno, Minnamari Vippola, and Antti Järvenpää. 2022. "The Effect of Severe Shot Peening on Fatigue Life of Laser Powder Bed Fusion Manufactured 316L Stainless Steel" Materials 15, no. 10: 3517. https://doi.org/10.3390/ma15103517