Cr-Mo-V鋼のクリープ疲労寿命評価法(<特集>高温強度)

概要

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Life analysis for fatigue-creep situations of Cr-Mo-V rotor steel was studied using the results of fatigue tests conducted with strain hold and stress hold at 500℃. The following conclusions were obtained. (1)Linear damage theory and the ductility exaustion rule are applicable when the results of high-temperature low-cycle fatigue tests and creep rupture tests are available. However, both methods are not appropriate for accurate life analysis; the former tends to yield an unsafe estimated life and the latter tends to yield too generous results. (2)Priest and Ellison well estimated the experimental results obtained at 565℃ using a combined deformation map-ductility exhaustion approach which defines creep damage as that caused by grain boundary sliding during hold time. Therefore, the same method was applied to the experimental results obtained by the authors. It was found that the method is excellent for accurate life analysis. (3)When the combined deformation map-ductility exhaustion approach is applied, the necessary creep rupture ductility can be substituted by the product of minimum strain rate and rupture time, both of which are obtainable by relatively short time creep tests.
社団法人日本材料学会の論文
1995-01-15