超高真空中における316FR鋼のクリープ疲労相互作用の有効応力概念に基づく評価

概要

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A series of creep-fatigue tests were conducted using 316FR steel at 650℃ in a very high vacuum environment of 0.1μPa. The test results indicate a creep-fatigue behavior which is completely free from the environmental effect of the air. In general, creep-fatigue life reduction occurs when the tension time is longer than the compression time. After the creep-fatigue tests, the fracture surfaces were investigated using a SEM. A good correlation exists between the creep-fatigue life and the fracture mode. When the fracture mode was predominantly transgranular, no life reduction occurred. On the contrary, when it was predominantly intergranular, a significant life reduction was observed. The overstress was experimentally investigated and the relation between the overstress and the inelastic strain rate was obtained. The creep-fatigue life evalution model based on the overstress was applied and it was shown that it predicts the life accurately.
一般社団法人日本機械学会の論文
1996-09-25