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测定了5CrNiMo 及3Cr2W8V 钢的疲劳裂纹扩展速率 da/dN。讨论了钢的屈服强度σ_s 及平面应变断裂韧性 K_(1C)和 da/dN 之间的关系,提出了经验表达式:da/dN=A·(△K)~2/E·σ_s·(K_(1C)-K_(max))。根据一种热处理状态下的 da/dN/△K 关系便可计算获得同种钢在其它热处理状态下的 da/dN 值。
The fatigue crack growth rates da / dN of 5CrNiMo and 3Cr2W8V steel were measured. The relationship between the yield strength σ_s of steel and the plane strain fracture toughness K_ (1C) and da / dN is discussed. The empirical expression da / dN = A · (△ K) ~ 2 / E · σ_s · (1C) -K_ (max)). According to a da / dN / ΔK relationship in the heat treatment state, da / dN values of the same kind of steel under other heat treatment conditions can be calculated and obtained.