Ni 基析出強化型超合金のクリープ破断寿命の化学組成からの推定方法

概要

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The program for estimating the creep rupture life at 900℃ from chemical composition has been developed on nickel-base precipitation hardened superalloys. In this program, the steady state creep rate (ε^^._S) and the creep rupture life (t_r) have been estimated by Evans-Harrison's and Monkman-Grant's equations, respectively, which have been represented by the following equations. ε^^._S=B′{(σ-σ_0)/σ_<0.05>}^<3.5>……(1) log tr+m・log ε^^._S=c……(2) σ, σ_0 and σ_<0.05> are applied stress, friction stress and 0.05% proof stress, respectively. B′ is the constant for all alloys. m and c are constants for each alloy. σ_0, σ_<0.05>, m and c have been represented as a function of structural factors calculated from chemical composition. Relationship between σ_0 and structural factors has been led by the theoretical analysis based on the dislocation theory. About 80% of the experimental creep rupture lives have fallen within a factor of two of the estimated lives at the various stress levels corresponding to the lives up to 10^4 h as for twenty eight alloys. Especially, for cast alloys with higher γ′ volume fraction, the creep strength has been estimated accurately by this program.
社団法人日本鉄鋼協会の論文
1982-03-01