Aパラメータ法によるCr-Mo-V鍛鋼のクリープ損傷評価における信頼性確保の検討

概要

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The "A"parameter method is frequently used to estimate creep damage of Cr-Mo-V steel forged rotors. The creep damage value estimated by this method may vary owing to the variance of data and the different means arising from different etching methods and/or the discrimination of different examiners. In this study, the variances and the means were calculated from numerous"A"parameter data of the same creep-damaged Cr-Mo-V steel forgings. Comparing these data with data from previous studles, the following results were obtained : (a) A method for estimating creep damage value which guaranteed an optional degree of safety was determined. (b) It was suggested that the percolation of grain boundaries played a large part in creep rupture of Cr-Mo-V steel forged rotors.
一般社団法人日本機械学会の論文
1997-06-25