A ONE-DIMENSIONAL HEAT-TRANSFER MODEL FOR LASER-SURFACE ALLOYING OF CHROMIUM ON COPPER SUBSTRATE

A one-dimensional unsteady-state heat transfer model based on explicit finite difference method of solution has been developed to simulate t he thermal profile in the course of laser surface alloying of a Cr-dep osited Cu substrate with a continuous-wave CO2 laser. In this model, a suitable temperature/phase dependence of the material properties has been considered. The temperature profile and depth of melting are foun d to be strong functions incident power density and interaction time. mechanism of transient melting and solidification following laser irra diation is discussed in the light of the present model.