抄録
Because of its excellent high-temperature strength and high resistance against stress corrosion cracking, modified 9Cr-1Mo steel is widely used as the materials in high temperature energy equipment. However, the occurrence of high cycle fatigue damage at high temperature has been concern. Therefore, in order to clarify the characteristics of high-cycle fatigue of modified 9Cr-1Mo steel, a high temperature rotary bending test was carried out. As a result, S-N curve indicated that fatigue limit did not appear within the range of 10^8 cycles at temperatures higher than 500℃. And it was clarified that fatigue cracks always started to occur at the surface of the test samples.
