Nb-V合金化处理对高锰钢辙叉组织与性能的影响

Effect of Nb-V Alloying on the Microstructure and Properties of High Manganese Steel Frog

本文研究了普通高锰钢Mn13的铌和钒合金化及其对组织和性能的影响。结果表明,由于大量非常细小而硬的Nb(C,N)和V(C,N)颗粒沉淀,Nb-V合金化高锰钢辙叉的晶粒比普通Mn13钢辙叉细化了1~2级。与普通ZGMn13辙叉相比,铌和钒合金化高锰钢辙叉的力学性能得到了有效改善,屈服强度、抗拉强度和冲击功分别提高了28%、11%和10%。性能的改善抑制了在使用期间由爆炸硬化引起的心轨水平裂纹的萌生。铌钒合金化高锰钢辙叉的使用寿命由原来的1.44亿吨提高到2.5亿吨以上。

Alloying of common high manganese steel Mn13 by Nb and V and their effect on microstructure and properties have been studied. The results show that due to the large of very fine and hard Nb(C,N) and V(C,N) particles precipitated,the grain of Nb-V alloyed high manganese steel frog is refined 1~2 grades compared to that of common Mn13 steel frog.Compared with the common ZGMn13 frog, the mechanical properties of Nb and V alloyed high manganese steel frog are improved effectively, the yield strength, tensile strength and impact energy are increased by 28%, 11% and 10%respectively. The improved properties inhibit the initiation of horizontal cracks in the point rail during service caused by explosion hardening. The service life of Nb-V alloyed high manganese steel frog is increased from original 150 million tons to more 250 million tons.