改良9Cr-1 Mo鋼部材のクリープ損傷評価 : (第1報, 硬さ測定による母材の評価)

抄録

The correlation between creep damage and hardness was obtained for the modified 9 Cr-1 Mo steel specimens crept in laboratory. The hardness became softer as the creep damage increased. The theoretical formulation of softening was done based on the kinetics of the dislocation structure. The formula gave quantitative correlation among the creep conditions of stress, temperature, creep time and Vickers hasdness. The effect of the creep conditions and initial hardness of the material on the creep damage vs. hardness correlation was analyzed, and a practical creep damage curve was proposed which should be used for the creep damage assessment in actual and aged components made of the modified 9 Cr-1 Mo steel.