Thermal fatigue behavior evaluation of shot-peened JIS SKD61 hot-work steel
Thermal fatigue cracking is one of the most important failure mechanisms in hot work die steels. Shot-peening can be used in a much wider field to obtain higher static strength, as well as better fatigue resistance. This study investigates the shot-peening effect on the microstructure and mechanical properties of hardened JIS SKD61 hot-work steel. The thermal fatigue test is based on cyclic induction heating and water cooling. A non-peened specimen with a hardness of 50 HRC was used as the reference material. The scanning electron microscopic observations showed craters on the surface and a severely worked hardened area in the shot-peened specimen subsurface. The microhardness values of the shot-peened surface were about 720 and 750 HV0.05 for the Almen intensity of 15A (typical shot-peened specimen) and 18A (severe shot-peened specimen), respectively. The work hardening depths of typical shot-peened and severe shot-peened specimens were about 20 and 30um, respectively. The thermal fatigue properties of shot-peened specimens, including the mean crack length, maximum crack length and crack distribution density, were better than those of non-peened specimens. Only a slight improvement in thermal fatigue properties occurred for the severe shot-peened specimen compared with typical shot-peened specimen.
Hot-work steel Vacuum heat treatment Shot-peening Thermal fatigue
Shu-Hung Yeh Liu-Ho Chiu Tao-Liang Chuang Cheng-Yen Wu
Department of Materials Engineering, Tatung University, Taipei 10452, Taiwan Metal Industries Research & Development Centre, Kao-Hsiung 81160, Taiwan Metal Industries Research & Development Centre, Kao-Hsiung 81160, Taiwan Department of Materials Eng
国际会议
北京
英文
189-193
2012-10-23（万方平台首次上网日期，不代表论文的发表时间）