長時間使用されたオーステナイト系ステンレス鋼の高温疲労強度と微小疲労き裂の進展

概要

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In order to obtain the fundamental information on the remaining life evaluaton of high temperature components, the high cycle fatigue strength o austenitic stainless steel used in service for a long time in fossil fuel power plant was investigated at 873 K, and it was compared with that of the virgin material. The fatigue strength of the ostservice material was significantly lower than that of the virgin material, and the carbide precipitation in the postsevice material played an important role in fatigue crack initiation. The small fatiue crack growth behavior in both materials was also studied. Small cracks in both materials propagated even in the region of lower J-integral range than the long crack threshold ΔJ_<th> of the virgin material. In addition, the small crack growth rate of the postservice material was several times faster than that of the virgin material. It was concluded that the information on crack growth in the virgin material is not always justifiable to the safety assessment of high temperature long term service components.
社団法人日本材料学会の論文
1989-12-15