2 1/4Cr-1Mo鋼のクリープと疲労の重畳効果特性に及ぼす大気雰囲気の影響

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The strain range partition lng (SRP) life relation was experimentally determine dat 550C both in air and in vacuum (<2×10^<-6>mmHg) for the annealed and the normalized and tempered 2 1/4 Cr-1 Mo steels, and the effects of air environment and heat treatment on the SRP life relation of 2 1/4 Cr-1 Mo steel were examined. All of Δε_<ij>-N_<ij> properties were found to be sensitive to the environment in the strain range lower than (Δε_<ij>)_<cr> while not in the strain range higher than (Δε_<ij>)_<cr>. The value of (Δε_<ij>)_<cr> was larger in the annealed material than in the normalized and tempered one. The effects of heat treatment on Δε_<pp>-N-<pp> and Δε_<cc>-N_<cc> properties were not so remarkable for the both materials, whereas Δε_<pc>-N_<pc> and Δε_<cp>-N_<cp> properties of the annealed material were superior to those of the normalized and tempered one. The tendency that in the annealed material N_<pc> was smaller than or equal to N_<cp> in air can be fully attributed to the environmental effect, because the present vacuum data of both materials show that N_<cp> tends to be smaller than N_<pc> independent of the value of the inelastic strain range. The present vacuum condition (< 2×10^<-6> mmHg) was not a perfect one for obtaining the SRP life relation in vacuum for 2 1/4 Cr-1 Mo steel. This conclusion was derived from the result that all the Δε_<cc>-N_<cc> data in the present vacuum condition gave shorter lives than those predicted by Manson's equation Δε_<cc>=D_c^<0.6>N_<cc>^<-0.6>. Based on these results and the facts reported in the literatures, a method to obtain the SRP life relation in perfect vacuum from both air data and imperfect vacuum data was proposed. The SRP life relation in perfect vacuum thus obtained was found to be useful to explain quantitatively the effects of air environment and heat treatment.
社団法人日本材料学会の論文
1986-03-15

2 1/4Cr-1Mo鋼のクリープと疲労の重畳効果特性に及ぼす大気雰囲気の影響

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