TC11钛合金在疲劳-蠕变交互作用下的解理断裂研究

CLEAVAGE RUPTURE OF TCll Ti ALLOY UNDER FATIGUE-CREEP INTERACTION

研究了具有等轴、双态和网篮三种组织的TC11合金在520℃下的疲劳—蠕变交互作用特性,发现在断裂过程中出现的解理特征不仅与蠕变空洞形核率有关,而且受拉伸保时过程中裂尖蠕变应变累积和裂尖应力状态的控制,即受临界空洞形核应变和临界空穴扩张比参数V_(GC)的综合影响。

The cleavage rupture behaviour of the TCll Ti alloy with various microstructures, i.e., equiaxed, duplex and interweaving, has been studied under fatigue--creep interaction at 520℃. It was found to be not only related to the rate of creep void initiating, but also controlled by the creep strain accumulation on holding under tension test and stress state at crack--tip. This seem to be combinably affected by both value of critic void initiating strain and parameter, V_(GC), of critic void growth.