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测定不同晶粒尺寸、γ’相以及不同Hf含量的粉末高温合金FGH97在650℃高温条件下的疲劳裂纹扩展速率,并将其与FGH95和FGH96两代粉末合金的疲劳裂纹扩展速率进行对比.用定量分析的方法对FGH97合金在疲劳断裂各个阶段的行为特征进行分析.较大晶粒尺寸的FGH97合金具有较低的裂纹扩展速率,合理的二次和三次γ’相匹配析出,可以获得较高的疲劳寿命;Hf元素的添加使合金的整体疲劳寿命增大;FGH97合金与FGH95和FGH96相比,具有较高的疲劳裂纹萌生抗力,更低的高温疲劳裂纹扩展速率.
The fatigue crack growth rate of powdery superalloy FGH97 with different grain size, γ ’phase and different Hf contents at 650 ℃ was measured and compared with the fatigue crack growth rate of FGH95 and FGH96 two generations of powder alloys. Quantitative analysis of the behavior of FGH97 alloy at various stages of fatigue fracture analysis of the characteristics of the larger grain size FGH97 alloy has a lower rate of crack growth, reasonable secondary and tertiary γ ’match precipitation, you can get higher The fatigue life of the alloy increases with the addition of Hf element. Compared with FGH95 and FGH96, the FGH97 alloy has higher fatigue crack initiation resistance and lower fatigue crack growth rate at high temperature.