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晶粒粗大是造成火车车轴失效的主要原因之一。通过对攀钢研究院开发的新型钒系微合金车轴钢晶粒粗化温度的研究,发现随着加热温度的提高,该型车轴钢奥氏体晶粒越来越大,但强碳化合物元素——钒元素能有效阻止奥氏体晶粒的长大,将其晶粒粗化温度提高到了1150℃以上,比普通碳钢的晶粒粗化温度高150～200℃。晶粒粗化温度的确定,可以为材料热处理工艺参数的制定提供参考,避免加热过程中出现晶粒粗化,造成组织缺陷。
Coarse grain is one of the main reasons for the failure of the train axles. Through the research on the grain coarsening temperature of the new vanadium-based microalloyed axle steel developed by Panzhihua Iron and Steel Research Institute, it is found that with the increase of heating temperature, the austenite grain size of the axle steel is more and more large, but the strong carbon compound - Vanadium element can effectively prevent the growth of austenite grains, the grain coarsening temperature increased to 1150 ℃ above, than ordinary carbon steel grain coarsening temperature 150 ~ 200 ℃. The determination of the grain coarsening temperature can provide a reference for the formulation of the material heat treatment process parameters, and prevent the coarsening of grains during the heating process, resulting in the organization defects.