Coating Effect on Increasing Mechanical Property of 6061-T651 Alloy by Laser Shock Processing
Laser shock processing (LSP) employs high-energy laser pulses from a solid-state laser to create intense shock waves into a material, which can induce compressive residual stresses in the target surface and improve its mechanical property efficiency. Three different ablative, sacrificial coating were chosen to protect the 6061-T651 alloys from surface melting by laser pulse. This paper analyzes the effect of the paint and foil coatings on the shock wave propagation into the 6061-T651 alloys and the resulting change in mechanical properties. The depths of hardening by laser processing of 6061-T651 alloys up to 1 mm, and the surface hardness reach to 138HV. When the laser pulse energy density increase from 2.8 GW/cm2 to 3.6 GW/cm2, the surface hardness of the black paint, aluminum foil and silica acid black paint samples increase to 19, 27, 36 respectively.
Yafang Han et al.
Y. K. Zhang et al., "Coating Effect on Increasing Mechanical Property of 6061-T651 Alloy by Laser Shock Processing", Materials Science Forum, Vols. 546-549, pp. 681-686, 2007