论文部分内容阅读
对一种镍基高温合金作了应力控制的蠕变-低周疲劳的复合试验。结果指出,缺口试样复合试验的寿命并不都满足线性累积损伤规律,即蠕变与低周疲劳间有时发生交互作用。交互作用的强弱与蠕变延性有关。在蠕变延性极小值的试验温度(650℃),交互作用最强。改变热处理制度提高蠕变延性后,在同样温度下不再发生交互作用。光滑试样在650℃没有观察到交互作用。根据断口特征和蠕变延性,分析和讨论了产生蠕变-疲劳交互作用的原因。
Creep - Low Cycle Fatigue Composite Test of Stress Controlled Nickel - Base Superalloy. The results indicate that not all the lifetimes of the composite test of notched specimens satisfy the rule of linear cumulative damage, that is, the interaction between creep and low cycle fatigue sometimes occurs. The strength of interaction is related to creep ductility. At the test temperature (650 ℃), the minimum of creep ductility, the strongest interaction. Change the heat treatment system to improve creep ductility, at the same temperature no longer occur interaction. Smooth samples showed no interaction at 650 ° C. According to the fracture characteristics and creep ductility, the causes of the creep-fatigue interaction are analyzed and discussed.