Mechanical properties and residual stresses changing on 00Cr12 alloy by nanoseconds laser shock processing at high temperatures

Abstract

Effects of laser shock processing (LSP) on 00Cr12 alloy's mechanical properties at high temperatures were analyzed by investigating the changing of the residual stress and tensile properties. The results showed that the compressive residual stress produced by LSP, which makes the 00Cr12 alloy's yield strength and tensile strength increase, still played an important role in the high temperature tensile test. The tensile fracture showed that the break position and expand direction were changed because of the residual compressive stress existing, and the residual compressive stress was greatly released with the increasing temperature. The results demonstrated that the cycle, stress amplitude and temperature-dependent relaxation of compressive residual stresses were more pronounced than the decrease of near-surface work strengthening.