辙叉用高锰钢的加热时效特性  

Aging characteristics of high manganese steel used for railway crossing

作　　者：杨帅 

机构地区：[1]中铁物总技术有限公司,北京100036

出　　处：《金属热处理》2016年第5期124-128,共5页Heat Treatment of Metals

摘　　要：对辙叉用高锰钢进行不同的时效处理,采用金相显微镜、扫描电子显微镜以及X射线衍射仪等方法对其微观组织进行分析。结果表明,在300℃即使时效了20 h,高锰钢的组织和性能的变化也是很小的;在350℃时效10 h,仅仅发生碳原子的偏聚或者微量的析出,对高锰钢力学性能的影响也是轻微的;在400℃时效10 h,针状碳化物析出得很充分,导致高锰钢的严重脆化;当时效温度为600℃的时候,仅时效了0.5 h,高锰钢即发生了共析转变,生成珠光体。Mechanical properties and microstructure of high manganese steel for railway crossing after different aging treatments were studied by means of optical microscopy（OM） , scanning electron microscopy （SEM） and X-ray diffraction（XRD） methods and so on. The results show that although aged at 300℃ for 20 h, the changes of the mechanical properties and microstructure are very little ; aged at 350 ℃ for 10 h, there is only segregation of carbon atoms or trace precipitation occurrs; aged at 400 ℃ for 10 h, the acicular carbides precipitate obviously, which results in severe embritflement of the steel ; when aged at 600 ℃ for 0.5 h, eutectoid transformation happens and austenite transforms into pearlite.

关 键 词：辙叉 高锰钢 时效脆化 针状碳化物 脱溶分解 

分 类 号：TG142.1[一般工业技术—材料科学与工程]