豪克能技术对铁路钢轨的强化研究

Research on the Strengthening of Railway Rails by Hawking Technology

研究了一种非加热、非增材的豪克能钢轨表面强化新技术,以U78CrV、U75V两种材质的钢轨为研究对象,应用正交试验法,以硬化层深度和表层硬度提升率为判断依据,通过极差分析得出每种钢轨的最优豪克能强化工艺。结果显示:最优工艺强化后钢轨硬化层深度不小于2.6 mm,表层硬度提升率不低于18.74%;钢轨耐磨性能提升50%以上;钢轨表层残余拉应力彻底转变为高值压应力,压应力层深度不小于3 mm;钢轨表面粗糙度由3.240μm降低至1.603μm,表面状态优化效果明显。

A new hawking rail surface strengthening technology of non heating and non additive was studied.With the rails made of U78CrV and U75V as the research objects,the optimal hawking strengthening technology for each rail was obtained through range difference analysis by using orthogonal test method and taking the hardened layer depth and surface hardness increase rate as the judgment basis.The rail was strengthened with the optimal process,and samples were prepared and tested.The results showed that the depth of hardened layer after the optimal process strengthening was no less than 2.6 mm,and the hardness increase rate of the surface layer was no less than 18.74%.The wear resistance of rail was improved by more than 50%.The residual tensile stress on the rail surface was completely transformed into a high value compressive stress,and the depth of the compressive stress layer was no less than 3 mm.At the same time,the rail surface roughness decreased from 3.240 μm to 1.603 μm.The effect of surface state optimization was obvious.