オーステナイト系ステンレス鋼347Hの高温クリープ疲労特性に及ぼす結晶粒径の影響とその表示式について

概要

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The effect of rain size on the strainrange partitioning life relation, that is, Δε_<ij>-N_<ij> relation, was quantitatively determined for 347H stainless steel at 750℃ by conducting creep-fatigue tests on five kinds of test materials with different grain size at 750℃ both in air and in an imperfect vacuum. It was assumed that the ductility normalized strainrange partitioning (DN-SRP) life relation in a perfect vacuum was exactly the same as that reported in the author's previos paper and was not influenced by grain size explicitly. As the results, it was found that the grain size dependence of tensile and creep ductilities, D_p=0.160+0.0438d^<-1/2> and D_c=0.540+0.140d^-1/2 (d: grain size in mm), and the Δε_<ij>-Ν_<ij> relaton in air can be expressed by D_p, D_c and d as follows: Δε_<pp>=(0.640-0.0438d^<-1/2>)D_pΝ^<-0.6>_<pp> Δε_<pc>=1.26D^<0.787>_pΝ^<-0.787>_<pc> Δε_<cp>=0.261D^<0.722>_cΝ^<-0.722>_<cp> Δε_<cc>=1.31D^<0.943>_cΝ^<-0.943>_<cc>
1989-09-15