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中文摘要：
高速铁路用SK115型弹条在实际使用过程中开裂。对裂纹及断口进行宏、微观观察、硬度测试、金相检验、化学成分分析，结合有限元模拟的分析的方法，对弹条开裂原因进行了分析。结果表明，弹条裂纹存在明显的穿晶现象，开裂性质为弯曲．扭转疲劳开裂；弹条表面存在脱碳层，并且存在局部表面缺陷，裂纹起源于弹条表面。弹条开裂的主要原因是在交变应力下产生局部应力集中，由于表面状态不良导致疲劳裂纹的形成是其发生疲劳断裂的另一重要原因。
英文摘要：
SKll5 spring fasteners for high-speed railway encountered cracking in actual use. Cause of the cracking was analyzed by macro and micro scope observation, hardness test, metallurgical test, chemical analysis combined with the finite element simulation analysis. The results show that the cracks of the spring fasteners have obvious transgranular features, the cracking characteristic belongs to bending- torsional fatigue cracking, the surface of spring fasteners exist decarburization layer and local surface defects, the cracks originate from the surface of the spring fasteners. The main reason for cracking is the local stress concentration produced under alternating stress, and the formation of fatigue cracks due to poor surface condition is another important reason for the fracture.
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