The effect of vanadium alloying on the wear resistance of pearlitic rails
The effect of vanadium alloying on the wear resistance of pearlitic rails
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DOI：
10.1016/j.wear.2019.203004
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发表时间：
2019-10
期刊：
影响因子：
5
通讯作者：
W. Solano-Alvarez;L. González;H. Bhadeshia
中科院分区：
文献类型：
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作者：
W. Solano-Alvarez;L. González;H. Bhadeshia
由于对珠光体钢轨的需求不断增加，以支持更重的负载和更高的速度，有轨电车和轻轨交通（LRT）的槽轨需要通过合金化或热处理（即热轧后的加速冷却）进行强化。在本研究中，使用无润滑双盘测试和详细的微观结构表征比较了五种不同商业等级的磨损性能。结果表明，钒合金钢的磨损率不到具有类似硬度的热处理等级的一半。这是由于与纯的钒铅矿相比，含钒铅矿的稳定性和韧性增加。证据表明，钒分配到珠光体形成过程中的珠光体片层。与热处理钢轨替代品相比，钒在耐磨性方面的这种改进可以使维护和生命周期成本降低约两倍。
Due to the increasing demand on pearlitic rails to support heavier loads and higher speeds, grooved rails for tramways and light rail transit (LRT) require strengthening via alloying or heat treatment, i.e. accelerated cooling after hot-rolling. In this study, the wear performance of five different commercial grades is compared using unlubricated twin-disc testing and detailed microstructural characterisation. Results indicate that the vanadium-alloyed steel experiencesless than halfthe wear rate of a heat-treated grade with a similar hardness. This is attributed to the increased stability and toughness of vanadium-containing cementite, as compared to pure cementite. The evidence suggests that vanadium partitions into the cementite lamellae during the formation of pearlite. This improvement in wear resistance due to vanadium could enable an approximately two-fold reduction in the maintenance and life cycle costs relative to heat-treated rail alternatives.