2.25Cr-1Mo 鋼のクリープ損傷に及ぼす応力及び歪みの影響

概要

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The effect of pre-creep on the creep life has been investigated over a stress range from 78.4 to 125 MPa at 873K. It was found that the creep life was decreased with increasing pre-creep stress and strain. In the case where the time elaspsed for pre-straining is relatively short(t≦3.6×10^5s), and thereby creep damage due to aging is unimportant, pre-creep strain has a dominant effect on the creep damage. Defining the creep damage parameter, Φ as the ratio of the minimum creep rate of a damaged specimen to that of an unused specimen, the extent of the structural deterioration is expressed as a function of pre-strain, ε_P as follows : Φ_p=(a・ε_P+1)^b where a and b are constants of the magnitude of 0.60 and 0.74 at 873K, respectively. The Monkman-Grant rule was obeyed for the damaged specimens, and the relationship between creep life and minimum creep rate is expressed as follows : (t_r/s)・(ε_m/s^<-1>)^Y=K_P where Y and K_P are constant independent of stress, and their values are 1.63 and 4.18×10^<-6>, respectively.
社団法人日本鉄鋼協会の論文
1994-05-01