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众所周知,不变形非金属夹杂物会大大地降低呈马氏体组织的高强度钢的疲劳强度[1]。夹杂物与基体的线膨胀系数显著不同,因此在淬火过程中,夹杂物周围便出现了很大的热应力[2、3]。这些应力局限于夹杂物区域内,与其它组织上的集中部位(包括马氏体晶粒端部)出现的应力相比,它只有在大得多的体积内才能保持平衡,所以在循环载荷作用下不变形夹杂物显得最为危险。
As we all know, non-deformation of non-metallic inclusions will greatly reduce the fatigue strength of high-strength steel was martensite [1]. The linear expansion coefficients of inclusions and matrix are significantly different, so there is a great thermal stress around inclusions in the quenching process [2,3]. These stresses are confined to the inclusion area and remain balanced only in much larger volumes than the stresses found at the concentration sites on other tissues, including the ends of the martensite grains, so that under cyclic loading Under the undeformed inclusions appear to be the most dangerous.