在研究Cr12Ni2WMoV钢疲劳裂纹扩展的基础上,本文进一步利用高倍电镜进行了断口微观分析,得到了可用于定量研究的疲劳条纹数据。比较详细地讨论了宏观疲劳裂纹扩展速率dα/dN与微观条纹间距α之间的关系,提出了解释观察现象的若干假设。依据上述假设,引入面积修正函数F后,可将dα/dN-α关系表达为 dα/dN=F(△K,R)·α(△K) 且指出F具有下述形式: F(△K,R)=A(△K)~m/[(1一R)K_c-△K] 最后,给出了Cr12Ni2WMoV钢锻件的F值。
TEM microfractography of the fatigue striation formation was further analyzed resulting from investigation of the fatigue crack propagation in Cr12Ni2WMoV steel, and the data for quantitative evaluation of striation interval was developed. The relationship between the rate of fatigue macrocrack propagation, da/dN, and microstriation interval, α, has been discussed. On the assumption to explain the phenomena observed and by interoducing an areacorrecting function: F(△K,R)=A(△K)~m/(1-R)K_c-△K the relation of (dα/dN)vs α may be expressed as dα/dN=F(△K,R)α(△K) The value F for Cr12Ni2WMoV steel is given.
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