本文研究了高温合金GH169 650℃下时间相关疲劳中氧化作用及其微观机制。试验表明,在相同应力和保持时间下,氩气中的循环寿命均低于大气中的循环寿命,损伤机制主要是高温氧化-疲劳交互作用。在高温大气中的断口表面覆盖有致密而均匀的氧化膜;而在高温氩气中的断口表面则为不连续氧化物质点。
The time-dependent fatigue and its micromechanism of superalloyGH169 at 650℃ have been studied. Under the same stress and duration, its cycliclife in Ar is shorter than that in air. The damage mechanism is mainly of the hightemperature oxidation and fatigue interaction. The fracture surface of GH169specimen oxidized at 650℃ in air is covered with a dense and even oxide film,but in Ar, with an uncontinuous oxide particles.
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