High-energy laser shock processing for a rectangular HSLA steel plate considering solid-liquid-vapor phase change

Abstract

Three-dimensional thermodynamic analysis of a high strength and low alloy (HSLA) rectangular steel plate under high-energy laser shock processing is carried out in this paper. Considering the solid-liquid-vapor phase-change process, three-dimensional transient temperature field, mass fraction of liquid phase and vapor phase for the rectangular HSLA steel plate are solved by the method of separation of variables. Meanwhile, the displacement and stress fields are derived by using the state-space method. It could be found that laser shock processing time increases the three-phase temperature a lot. The greater the coordinate x and y are, the larger is the mass fraction of liquid phase. The laser moving speed and length to thickness ratio also have great influences on the displacement and stress fields. Variation of deflection curve across the thickness of plate is no longer smooth from top surface to bottom surface because of high-energy laser shock processing at instantaneous time which could be ignored.