1.3Mn-0.5Mo-0.5Ni 鋼のクリープ変形及び破断寿命の修正θ法による評価

概要

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Creep curves of 1.3Mn-0.5Mo-0.5Ni steel were analyzed using the modified θ projection concept based on the following equation : ε=ε_0+A{1-exp(-αt)}+B{exp(αt)-1} where ε is the strain, t is the time, and ε_0, A, B and α are the parameters determined by curve fitting. The equation could describe the measured creep curves over the whole creep stages up to 90 percent of the rupture life. The modified θ projection concept could successfully predict long term rupture lives obtained independently on the same material. Heat-to-heat variations in creep properties were discussed on the basis of the creep curve analysis. The parameters ε_0, A and α were invariable among all the heats investigated. Only the parameter B related to the weakening process was different among the heats, indicating that the difference in the weakening parameter B was primarily responsible for the heat-to-heat variations.
社団法人日本鉄鋼協会の論文
1992-06-01