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50 kg/m钢轨在使用一段时间后踏面出现掉块缺陷。采用光学显微镜、图像仪和低倍检验等方法对钢轨踏面掉块缺陷产生的机理进行了分析和研究。结果表明,掉块缺陷的形成是由于钢轨滚动接触疲劳伤损所致。改善轮轨接触方式,减少钢轨踏面的轮轨接触应力,可以减缓曲线钢轨踏面压溃、剥离裂纹和浅层状剥离掉块伤损的出现,通过对钢轨进行及时的预防性打磨,是预防和减轻滚动接触疲劳伤损的最有效方法。
50kg / m rail in the use of the tread surface defects after a while. The mechanism of the defect of the rail tread surface was analyzed and researched by optical microscopy, imager and low magnification test. The results show that the formation of the dropout defect is caused by the rolling contact fatigue damage of the rail. Improve the wheel and rail contact mode, reduce rail tread wheel-rail contact stress, can reduce the curve rail tread crush, peel off the crack and shallow peel off the occurrence of block loss, through timely preventive grinding of the rail, is to prevent and The most effective way to reduce rolling contact fatigue damage.