Investigation of the effect of laser treatment on the longitudinal and transverse velocity of an aluminum alloy

Abstract

The velocities of longitudinal and transverse waves for aluminum alloy 2024-T62 shocked by a high-power Nd: Glass laser are investigated by a laser ultrasonics method. The results show that the velocity of the longitudinal wave measured after the laser-shock processing increases at the center and decreases at the edge of the laser-shocked area (LSA). The maximum relative increase is 28% and the maximum decrease up to 10%, when compared with that measured before the alloy was shocked by laser processing. The velocity of the transverse wave decreases at any position within LSA, the maximum relative decrease being 13%. The decrease at the edge of LSA is larger than that at the center.

Coating Influence on Residual Stress in Laser Shock Processing

“…In general the surface of the substrate is typically covered with an insulation absorption layer. On top of the absorption layer there is another layer which is transparent to the laser light and acts as a tamper, that is, as a confinement "cover" for the built pressure [1][2][3]. This high pressure in a shock wave generated travels down into the metal, and strains the material.…”

Study of the Effect of Coatings on Mechanical Properties of TC4 Titanium Alloy during Laser Shock Processing

“…The laser pulse passes through the transparent overlay and strikes the opaque overlay causing it to begin to vaporize partially. The vapor absorbs the remaining laser light and produces a rapidly expanding plasma plume [4][5][6]. The expanding plasma is confined between the surface of the part and the transparent overlay, and a rapidly rising high-pressure shock wave propagates into the material.…”