钢轨使用后的表层组织与性能分析  

THE ANALYSIS OF SURFACE LAYER MICROSTRUCTURES AND PROPERTIES OF RAIL TREAD

作　　者：赵秀娟[1] 陈春焕[1] 杨德新[1] 于建英 董永红 

机构地区：[1]大连铁道学院材料科学与工程系,大连116028

出　　处：《理化检验（物理分册）》2002年第9期384-387,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

基　　金：铁道部专项基金资助 (J2 0 0 0 2D46

摘　　要：对 6 0U74普通钢轨使用后的表面变形层组织与性能进行了分析。结果表明 ,钢轨运行约 3a(年 )后 ,在其表面形成约 4 0～ 70 μm的白层 ,组织为过饱和碳的α Fe ,晶粒显著细化 ,达到4 0nm ,同时钢轨表面的显微硬度比心部高 2倍以上 ;次表面为变形的片状珠光体组织 ,片状碳化物发生碎化 ,硬度也有一定的提高。The microstructures and properties of the deformed surface layers of the 60U74 rails used in shengyang dalian track were analyzed. The results showed that, after the tracks had been used for longer than three years, the white layer with the thickness of 40～70 micrometers was formed on the surface of tread. The microstructure of the white layers was ferrite with supersaturated carbon, the grains were fined to about 40 nanometers, and the micro hardness was higher than the original inner by twice at same time. The sub surface were deformed pearlite, the flake carbides were broken, and the hardness increased.

关 键 词：钢轨 白层 纳米晶结构 表面变形成 组织结构 铁路 显微硬度 

分 类 号：U213.4[交通运输工程—道路与铁道工程]