Ni基超合金単結晶の低サイクル疲労寿命に及ぼす応力集中と結晶方位の影響

抄録

Low cycle fatigue tests were conducted on single crystal Ni-base superalloy (CMSX-4) at room temperature. Smooth round straight bars and circumferentially notched round bars with <001> and <111> orientation were prepared to investigate the effect of stress concentration and crystallographic orientation on fatigue life. A simple approach is proposed for the assessment of low cycle fatigue life of single crystal Ni-base superalloy using material-dependent master curve, which is applicable to specimens with different stress concentration and crystallographic orientation.