Abstract
Abstract Laser surface alloying (LSA) of Cu with pre-deposited Cr has been carried out using a high power continuous wave CO 2 laser. Following LSA, the surface microstructure and composition have been correlated with the laser processing parameters. It is found that a judicious selection of laser power density ( Q ) and scan speed ( v ) (or interaction time, t i ) is essential to obtain a defect-free and uniform alloyed zone (AZ) for a given pre-deposit thickness ( t z ). The AZ-depth is directly related to Q and t i . Microstructurally, the AZ consists of dispersed Cr-rich particles in the Cr-alloyed Cu-rich solid solution. Rapid quenching in the present LSA routines has extended the solid solubility of Cr in Cu to about 4 at.%. The total Cr content in the AZ varies inversely with Q and t i for a given t z . Finally, a process optimization diagram has been constructed to predict the microstructure and composition of the AZ for the present system for different conditions of LSA.
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