複合荷重下の1Cr-Mo-V鋼のクリープ疲労相互作用

概要

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The combined creep-fatigue loading tests on lCr-Mo-V steel were carried out under the creep loading conditions in the transgranular fracture region on the creep fracture mode map obtained from the static creep rupture tests. The data obtained were evaluated using the linear life fraction damage rule. The specimens under combined creep-fatigue loading were ruptured by an accumulation of either creep damage (ψ_c) or fatigue damage (ψ_f), and the values ofψ_c andψ_f at fracture were about 0.5 and 0.8, respectively. This relation for lCr-Mo-V steel showed the same trend as that for SUS 304 or 316 stainless steel obtained from the combined creep-fatigue loading test With the same loading condition, but the values ofψ_c andψ_f for lCr-Mo-V steel were different from those for the stainless steels. It was considered that this difference was mainly due to lowering of creep rupture life arising from softening Of lCr-Mo-V steel during loading. The ψ_c vsψ_f relation obtained for the present steel almost agreed with that obtained from the interspersion test in MPC.
社団法人日本材料学会の論文
1986-04-15