研究了ＧＨ３０和ＧＨ３４合金的蠕变－疲劳交互作用，观察到两种负交互作用：ＧＨ３０合金在先蠕变后疲劳的条件下的负交互作用和ＧＨ３４合金在连续循环蠕变的条件下的负交互作用。前者的交互作用项中疲劳损伤指数远大于蠕变损伤指数。因而负交互作用主要是由于预蠕变部分地抑制了后续疲劳的损伤。后者的交互作用项中的蠕变损伤指数远大于疲劳损伤指数。因而负交互作用主要是由于疲劳部分地消除了蠕变损份。还用微观观察的结果分析了这两种负交互作用的微观本质。
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. Correspondent: KONG Qingping, professor, Institute of Solid State Physics, Chinese Academy of Scicnces,Hefei 230031
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