本文对具有不同碳含量的欠速淬火钢轨的力学性能、断裂韧性、金相组织及硬度进行了对比试验,结果表明,钢轨经欠速淬火后,强韧性及塑性均有明显提高,且淬火硬度越高,不仅耐磨也抗剥离,结合铺设试验,探讨了欠速淬火提高钢轨强韧性能的原因,及其含碳量、硬度与使用性能的关系。 In this paper, the mechanical properties, fracture toughness, microstructure and hardness of under-quenched steel rails with different carbon contents were compared. The results show that the strength and ductility and plasticity of the rail after quenching are obviously improved, and the quenching hardness The higher, not only wear-resistant but also anti-peel, combined with laying test to explore the under-speed quenching to improve the toughness of the rail cause, and its carbon content, hardness and service performance.