Laser Shock Processing of an Austenitic Stainless Steel and a Nickel-base Superalloy
摘要
An austenitic stainless steel 1Cr18Ni9Ti and a solid solution-strengthened Ni-base superalloy GH30 were shock processed usinga Q-switched pulsed Nd-glass laser. Microstructure, hardness and residual stress of the laser shock processed surface wereinvestigated as functions of laser processing parameters. Results show that high density of dislocations and fine deformationtwins are produced in the laser shock processed surface layers in both the austenitic stainless steel and the nickel-base superalloy.Extensive strain-induced martensite was also observed in the laser shock processed zone of the austenitic steel. The hardnessof the laser shock processed surface was significantly enhanced and compressive stress as high as 400 MPa was produced inthe laser shock processed surface.