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通过室内试验研究了三种轨钢(不同金相组织的U71Mn轨样)的接触疲劳性能。试验表明,试样表层产生严重的塑性变形是形成接触疲劳破损的主要原因;通过热处理可提高轨钢的强度及硬度,接触疲劳强度也随之提高。作者分析了曲线地段的外轨内侧轨距角处(采用轮轨润滑方法)形成接触疲劳破损的原因,并根据室内试验结果提出在具有润滑条件的曲线上,钢轨以采用高强度淬火轨或合金轨为宜。
The contact fatigue behavior of three kinds of rail steel (U71Mn orbitals with different microstructure) was studied through laboratory tests. The test shows that the plastic deformation of the sample surface is the main reason for the contact fatigue failure. The strength and hardness of the rail steel can be increased by heat treatment, and the contact fatigue strength also increases. The author analyzes the reasons for the contact fatigue failure caused by the inner track gauge angle (using the wheel-rail lubrication method) in the curved section. According to the indoor test results, it is proposed that on the curve with the lubrication conditions, the rail adopts a high-strength quenching rail or alloy Rail is appropriate.