|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Fatigue and Fracture III
||Effect of Laser Shock Peening Processing Parameters on the Microstructure, Residual Stress, and Fatigue Behavior of Additive Manufactured CoCr Alloy
||Micheal Kattoura, Jan Kaufman, Boetang Twum Donkor, Seetha Ramaiah Mannava, Vijay Vasudevan
|On-Site Speaker (Planned)
The effect of Laser Shock Peening (LSP) on the microstructure, residual stress, and fatigue behaviour of Additive Manufactured (AM) CoCr Alloy was investigated. Three LSP processing parameters were studied 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. The use of aluminum tape cut down the processing time drastically but caused a drop in the magnitude of the residual stress compared to vinyl tape. The shift in layers created a smoother surface without major change in the residual stresses. Peening with SHG laser created higher compressive stresses compared to IR laser. The results showed that LSP, in all the studied conditions, led to an increase in the hardness and high magnitudes of surface compressive stresses that led to an increase in the fatigue life of AM CoCr.
||Planned: Supplemental Proceedings volume