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对Inconel 690(TT)合金腐蚀疲劳裂纹尖端塑性区微观结构进行观察,并研究裂纹尖端塑性区及载荷比对模拟压水堆环境下的裂纹扩展行为的影响。裂纹尖端小范围屈服时,模拟压水堆环境对裂纹扩展速率有3倍左右的加速作用。。
The microstructure of the plastic zone of fatigue crack tip of Inconel 690 (TT) alloy was observed and the influence of plastic zone and load ratio at crack tip on the crack propagation behavior under simulated PWR environment was studied. When the tip of crack tip yields in a small area, the simulated PWR environment accelerates the crack propagation rate by about 3 times. .