基于绿色再制造的火车车钩裂纹激光修复和表面强化

车钩是铁路车辆的关键部件之一,钩尾销孔承载面产生的裂纹是其主要失效形式.为了实现对车钩的绿色再制造,文中通过实验研究了激光熔覆技术在车钩裂纹修复方面的应用,并分析了熔覆材料的硬度分布、耐磨性、低温冲击韧性以及结合区域的微观组织特征.实验结果表明,熔覆材料与基体实现了冶金结合,硬度分布合理,耐磨性和低温冲击韧性都比母材有了较大提高,为开展产业化的绿色再制造奠定了基础.为了防止新造车钩出现裂纹,提出了一种新的激光淬火工艺,替代原有的中频淬火工艺,实验结果表明,激光淬火的硬度和耐磨性都比中频淬火有较大提高,而且兼顾了车钩总体的力学性能,可以在实际生产中应用.

Laser Cladding and Surface Hardening of Railcar Coupler Based on Green Remanufacture Engineering

Coupler is one of key components of railcar.The crack in loading surface of couple pinhole is the main failure mode.In the paper laser cladding technology is applied in couple repair with experiments.Some characteristics of deposition material are analyzed including hardness gradient,wear resistance,impact toughness in low temperature.The experiment results show that it is metallurgical bonding,and the hardness gradient is perfect.The characteristics of wear resistant and impact toughness are better than pa...