クリープ疲労複合荷重を受けたSUS316鋼の650℃におけるクリープ疲労相互作用

概要

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The combined creep-fatigue loading tests have been carried out on SUS 316 stainless steel at 650℃. The data obtained were evaluated using the linear life fraction damage rule. The results evaluated were discussed on the basis of the observations of cracking arid fracture modes. SUS 316 stainless steel under combined creep-fatigue loadings at 650℃ was ruptured by an accumulation of either creep damage or fatigue damage. The better evaluation of accumulated creep damage to rupture could be made using a term of Σ^^<Nc>__1ε_c/(Σε_c)_<cyclic>, where N_c is the number of combined creep-fatigue loading cycles to rupture, combined creep-fatigue loading test, and (Σε_c)_<cyclic> is the creep strain in creep loading part of the creep strain to fracture in cyclic creep test. The specimens of which the rupture life was evaluated by the accumulation of fatigue damage were fractured by the growth of fatigue transgranular cracks. On the other hand, the specimens of which the rupture life was evaluated by the accumulation of creep damage were fractured by the growth and linkage of wedge-type intergranular cracks. It is suggested from discussing on the present data and the previously obtained data for SUS 304 stainless steel at 700℃ that further investigation is needed concerning the correlation between creep-fatigue interaction and creep fracture characteristics.
社団法人日本材料学会の論文
1984-08-15