A Study of LSP Technique Effect on the Wear Resistance for Aluminum and Copper Alloys

摘要

Laser is becoming an important surface treatment to induce a compressive residual stress field, which improves micro-hardness, wear resistance and fracture properties of components via laser shock processing (LSP) technique. This work investigates the effect of LSP technique to enhance wear resistance of 6009 Al and 70275 Cu-Ni alloys by using Nd: YAG laser (λ= 1064 nm, t= 10 ns). Four different pulse repetition rates have been used to perform hardening (2, 3, 4 and 5 Hz). A pin-on-disc technique has been used to evaluate wear rate of the specimens as-received and specimens treated by Nd: YAG laser at different applied loads with 750 rpm and 60.8 HRC of rotating disc. It is observed that LSP treatment can improve the wear resistance of both alloys, where the wear rate is reduced by 69.23% for 6009 Al and 69.11% for 70275 Cu-Ni compare to untreated LSP samples due to work hardening and compressive residual stress of LSP impact. SEM micrograph analysis of worn surface showed that the grooves and compacted debris of LSP treated sample are smaller and less than these untreated LSP samples.