| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture IV: Toward Confident Use in Critical Applications
|
| Presentation Title |
Effect of Laser Shock Peening Processing Parameters on the Microstructure, Residual Stress, and Fatigue Behavior of Additive Manufactured CoCrMo Alloy |
| Author(s) |
Micheal Kattoura, Boetang Twum Donkor, Jie Song, Jan Kaufman, Seetha Ramaiah Mannava, Vijay Vasudevan |
| On-Site Speaker (Planned) |
Micheal Kattoura |
| Abstract Scope |
The effect of Laser Shock Peening (LSP) on the microstructure, residual stress, and fatigue behaviour of Additive Manufactured (AM) CoCrMo Alloy was investigated. Three LSP processing parameters were studied to optimize the laser peening process 1) sacrificial layer: vinyl tape versus aluminum tape, 2) shift between two peening layers, and 3) laser wavelength: infrared (IR) laser versus second harmonic generation (SHG) laser. In all studied laser peening conditions, laser peening induced a Strain-Induced Martensitic Transformation (SIMT) shifting the initially FCC structure to HCP+FCC structure at the surface. Laser peening converted the high tensile residual stresses created by the AM process to high compressive stresses that protects the material against different type of metal failures. The laser peened samples showed increase in the yield strength by around 15%. Laser peening improved the fatigue life of AM-CoCrMo by 10x to 15x of that of the as-built samples. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |