オーステナイト系ステンレス316FR鋼溶接材の供用中クリープ破断寿命予測法

抄録

The present paper proposes new creep life prediction methods that can be used in situ as an in-service inspection tool for the condition-based monitoring of high-temperature structure components of 316FR stainless steel that has been developed in Japan for fast breeder reactors. The methods were based on two types of the modified theta methods and the combination of the modified theta and modified omega methods and were applied to creep deformation data during creep tests made at different applied stress levels at 823K and 923 K in air. Creep lives were predicted by the proposed three methods at arbitrary time in the continuous measurement of deformation during the creep tests. The results show that the combination of the modified and modified omega methods gives the most accurate prediction of creep rupture time at the two levels of test temperature for different applied stress levels.