Research on Finite Element Simulation and Recrystallization of Laser Shock Peened Nickel-Based Single-Crystal Superalloy

As the key material of aero-engine turbine blades, nickel-based single-crystal superalloys are in long-term service under high temperature, high pressure, and high rotational speed and are prone to fatigue failure. DD6 superalloy is a nickel-based single-crystal superalloy widely used in advanced aero-engines in China. In this work, the recrystallization study of laser shock peened nickel-based single-crystal superalloy was carried out; the finite element model of laser shock peened nickel-based single-crystal superalloy was established, and the influence law of laser shock peening overlap rate and laser shock peening times on the residual stress field was obtained. Secondly, the effects of different laser shock peening temperatures on the material properties of the nickel-based single-crystal superalloy after heat treatment were investigated. It was concluded that heating up to 300 °C during laser shock peening of the nickel-based single-crystal superalloy can effectively suppress the recrystallization.