本文研究了不同温度下GH136合金的疲劳蠕变交互作用,得到变温断裂特征图,结果表明,温度的降低将使材料的抗蠕变损伤能力迅速增加,导致F区的扩大和C区的缩小,甚至在550℃下C区完全消失。即在全部应力区间,即使疲劳应力不大,疲劳断裂仍占优先地位。可用一个材料参量Ω粗略预测C区完全消失的条件。
The relative ratio of fatigue resistance to creep resistance of materialsvaries with test temperature. As the temperature decreases, the creep resistance,since it is a thermal activation process, becomes relatively larger than fatigueresistance. The fatigue damage therefore becomes predominant, and results inexpansion of fatigue fracture region (F region) and shrinkage even complete elimina-tion of creep fracture region (C region). This phenomenon could be understood onthe basis of the integrated model of competitive and eumulative models of fatigue/creep interaction. A material parameters, Ω, can be used to estimate the temperatureat which the creep fracture region is completely depressed.
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