Physical model and numerical simulation of intense pulsed electron beam surface modification

A one-dimension temperature and stress model is proposed based on the beam-target interaction process and thermal-elastic theory for the intense pulsed electron beam treatment. The temperature and stress profiles are derived by the numerical simulation. According to the simulation, the melted layer is about 2000nm in depth, the rate of rapid heating and cooling reaches 108～109 K/s, the amplitude of quasi-static thermal stress is about several hundreds MＰa, the vibratory frequency of thermal stress wave is about 10-6~108Hz. The simulation explains satisfactorily the observed experimental phenomena as the surface melting depth and the depth distribution of microhardness.