道岔用高锰钢组织与性能研究

THE RESEARCH OF PROPERTIES AND MICROSTRUCTURE OF SIDETRACK HIGH MANGANESE STEEL

道岔是铁路轨道的关键部位，也是铁路轨道最易失效的部位。随着客运量以及运行速度的不断增加，道岔的磨损程度加重，因此需要一种新的热处理工艺，用于提高道岔用高锰铜的力学性能。主要研究在不同热处理工艺下高锰钢ZGMn13的组织性能变化，分别对试验进行了不同温度的热处理方式。水韧处理和水韧处理后再进行300℃保温3h的回火处理分别选取与水韧处理相关的若干组试验温度研究结果表明：高锰钢ZGMnl3经过水韧处理后，奥氏体晶界处的碳化物溶解，变成单一奥氏体组织，水韧处理后的试样的力学性能明显优于原样；水韧处理后在经过回火处理，奥氏体弥散析出碳化物颗粒，可以起到固溶强化的作用，提高钢样的力学性能。在相同的热处理工艺中，最佳的水韧处理温度在1080℃附近。

Turnout is a key component of railway track, and it is also the most prone to failure of railway track parts. With passenger traffic and speed increasing, turnout increased degree of wear, so we need a new heat treatment process to improve turnout with a high manganese steel mechanical properties. This paper studies the changes of microstructure and properties of high manganese ZGMnl3 under different heat treatment. Experiments were carried out at different temperatures on the heat treatment. Water toughening treatment and Water toughening treatment with 300 ℃ tempering heat treatment 3 hours select different temperature respectively. The results show that： After high manganese ZGMnl3 water toughening treatment, anstenite grain boundary carbides dissolve and become a single austenite. Water toughening treated much better than the mechanical properties of the initial sample. Tempering after water toughening treatment, Austenite dispersed carbide particles and it plays a role in solid solution strengthening. In the same heat treatment process, the optimum water toughening treatment temperature is near at 1 080 ℃ .