Experimental Study on Residual Stress of K24 Superalloy in Laser Cladding Zone by Laser Shock Processing
The surface of K24 superalloy was processed with laser cladding & LSP (laser shock processing). Residual stress in the laser cladding zone by LSP was measured with X-ray stress tester X-350A, and the variational rule of residual stress in the cladding zone by tempering treatment of 8 hours and 16 hours was measured, respectively. The experimental results show that compressive residual stress of K24 superalloy surface by laser cladding & laser shock processing is above -600MPa, which exceeds residual stress by mechanical peening treatment; and there is no clear effect on residual stress by tempering treatment at 600°C for 8 hours and 16 hours, respectively, which can improve fatigue life of K24 superalloy.
Yu Zhou, Shan-Tung Tu and Xishan Xie
J. Z. Lu et al., "Experimental Study on Residual Stress of K24 Superalloy in Laser Cladding Zone by Laser Shock Processing", Key Engineering Materials, Vols. 353-358, pp. 453-456, 2007