CREEP-FATIGUE INTERACTION IN ALLOYS GH30 AND GH34
GH30和GH34合金的蠕变－疲劳交互作用

Two different negative interactions in alloys GH30 and GH34 were observed under prior creep followed by fatigue and under continuous cyclic creep,respectively.The exponent of the fatigue damage, for the former, in the interaction term is much large than that of the creep damage, and hence the negative interaction is mainly as a result of the sequential fatigue damage being restrained by the prior creep. While the exponent of the creep damage,for the latter, in the interaction term is much large than that of the fatigue damage, and hence as a result of creep damage being partly recovered by the fatigue (cyclic loading and unloading). The microscopic origin of the two different negative interactions has been explained in the light of microscopic observations.