本文通过对某钢厂滚动接触疲劳寿命较低的S55C轴承钢取样做蓝脆断口试验：SEM显微形貌分析和红外吸收光谱测定试样中碳、硫的不均匀度等理化特性分析，同时对该钢的宏观夹杂物进行测定，发现该钢半径二分之一区域处的碳、硫等元素的含量较高，边部与心部都为负偏析，而且其断口SEM的显微形态上有硫化物的析出并伴随微区的沿晶断裂，从而找出了导致该钢疲劳寿命较低的主要原因。
This paper discusses the cause of contact fatigue short life of S55C steel for bearing parts, By SEM Analysis, infra-red absorption spectrometric method, we determined of carbide segregation and sulphides appear as in the mid-radius position. There is decarburization in the surface zone and center zone. This is a cause that contact fatigue life is shortly.
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