1 Cr-1 1/4 Mo-1/4 V鋼のクリープき裂成長速度の支配力学因子の検討

概要

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The creep crack growth behavior of 1 Cr-11/4 Mo-1/4 V steel was investigated at 565℃ using center-notched plate specimens with proportional geometry in order to identify the most probable governing mechanical parameter of the phenomenon. It was found that even for this low ductile material the creep crack growth rate could successfully be correlated with modified J-integral J', regardless of the specimen size, while the stress intensity factor K_I and the net section stress σ_<net> gave poor correlation with the crack growth rate. This result was quite consistent with those obtained in previous papers using SUS 304 stainless steel which has a relatively high ductility. It was concluded that J' was the most probable mechanical parameter which governed the creep crack growth behavior.
社団法人日本材料学会の論文
1978-12-15