THERMAL FATIGUE PROPERTIES OF LASER PEENED HOT WORKDIE STEEL (H13)

摘要

Application of laser peening for hot work die steel (JIS-SKD61, AISI-H13) was investigatedrnby thermal fatigue test. Prior to the test, residual stress on the specimen of laser peenedrnsurface was approximately -1000 Mpa, and the depth of the created compressive stress wasrnapproximately 1800mm. During the test, compressive residual stress of laser peened area wasrnhigher than that of the area not laser peened. After the test, compressive residual stress for thernlaser peened area had almost disappeared. The increase of crack growth resistance by laserrnpeening was shown by crack measurement.