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金属学报  1980 

高强钢疲劳断口的扫描电镜观察和裂纹扩展机制的探讨

, PP. 140-251

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Abstract:

利用扫描电镜对两种高强钢的疲劳断口进行了观察,并参照裂纹扩展速率曲线(logda/dN-log△K)进行了分析,其结果如下(1)在对应低速率区的断口表面存在三个特征形貌区,这表明在该区的裂纹扩展过程具有三个阶段裂纹形成,微裂纹扩展,和一个受沿晶开裂机制和穿晶疲劳条纹生长机制所控制的过渡阶段.(2)在中速率区,疲劳裂纹扩展的发生主要是受疲劳条纹生长机制作用.但是,发现疲劳条纹间距S并不与宏观裂纹扩展速率dα/dN相一致.(3)在高速率区,裂纹扩展速率行为是由疲劳条纹生长机制和韧窝机制所控制.有关这两种机制的相互作用和韧窝生长规律都进行了定量研究.

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