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提出了一种可以综合反映多组织因素对GH4738合金疲劳裂纹扩展速率影响的多组织因素交互影响方程,并利用不同的热处理制度设计了具有不同组织特征的试样.测定了经不同热处理制度后GH4738合金在650℃下的疲劳裂纹扩展速率.利用该方程分析了GH4738合金晶粒尺寸、碳化物及γ′相尺寸对疲劳裂纹扩展速率的影响.结果表明,多组织因素交互影响方程能很好地定量描述各组织因素对GH4738合金疲劳裂纹扩展速率的影响及其综合影响.增大晶粒尺寸、降低γ′相及碳化物尺寸均可降低GH4738合金疲劳裂纹扩展速率,并且晶粒尺寸对GH4738合金的裂纹扩展速率的影响程度要高于γ′相尺寸及碳化物尺寸.
A multi-tissue interaction equation that can comprehensively reflect the effect of multi-tissue factors on the fatigue crack growth rate of GH4738 alloy was proposed and the samples with different microstructures were designed by using different heat treatment systems.The GH4738 Fatigue crack growth rate of alloy at 650 ℃ .The influence of grain size, carbide and γ ’phase size on the fatigue crack growth rate of GH4738 alloy was analyzed by using this equation.The results show that the multi-tissue interaction equation can well Quantitative description of the effect of various organizational factors on the fatigue crack growth rate of GH4738 alloy and its combined effects.Improvement of the grain size, the reduction of γ ’phase and carbide size can reduce the fatigue crack growth rate of GH4738 alloy, and the grain size of GH4738 alloy The effect of crack propagation rate is higher than the γ ’phase size and carbide size.