动车组车轮轮缘塑性变形白层组织分析  

Microstructure Analysis of Deformed White Etching Layer on Wheel Flange of High Speed Train

作　　者：杨姗洁 任瑞铭[1,2] 陈春焕[1,2] 潘睿[1] 赵秀娟[1,2] YANG Shanjie REN Ruiming CHEN Chunhuan PAN Rui ZHAO Xiujuan(School of Materials Science and Engineering, Dalian Jiaotong University, Liaoning Dalian 116028, China Rail Transit Key Laboratory of Key Materials of Liaoning, Dalian Jiaotong University, Liaoning Dalian 116028, China)

机构地区：[1]大连交通大学材料科学与工程学院,辽宁大连116028 [2]大连交通大学辽宁省轨道交通关键材料重点实验室,辽宁大连116028

出　　处：《摩擦学学报》2016年第5期622-628,共7页Tribology

基　　金：国家重点基础研究发展规划项目(973)(2015CB654802)资助~~

摘　　要：本文作者对动车组ER8C车轮轮缘白层的微观组织进行了观察,重点对由于剧烈塑性变形而形成的白层进行了分析和探讨.在光镜下可以观察到白层厚为3~18μm,分布不连续.在扫描电镜下,塑性变形白层主要有两种类型：一种为经塑性变形作用而细化的组织和经动态再结晶作用得到的铁素体纳米晶,后者具有纳米量级的铁素体晶粒.白层内的碳化物数量与塑性变形程度及运行过程中的温升有关,越接近表层未溶碳化物越少、晶粒越小.白层形成机制主要分为两种：一种为反复塑性变形作用的机制,导致铁素体破碎细化同时伴随碳化物碎化溶解;另一种为变形与一定温升综合作用的机制,表层发生动态再结晶而形成超细晶粒组织并伴随碳化物溶解,后者在超细晶粒形成中起主导作用.The microstructure of the white etching layer, especially for the deformed white etching layer, on high speed train flange was observed in this study. The white layers were thin and discontinuously distributed by making observation on a optical microscope. By using scanning electron microscopy, two types of microstructure were included in the deformed white etching layer, i.e. fine microstructure by plastic deformation and ferrite nanocrystalline by dynamic recrystallization.The amount of carbide in the white etching layer was related to the degree of plastic deformation and temperature rise, and the number and the grain size of carbide were low in the vicinity of surface. There are two mechanisms for the formation of the white etching layer. One was repeated plastic deformation mechanism, i.e. refinement of the ferrite grains and the dissolving the carbide. Another was deformation and temperature rise mechanism, i.e. formation of ultra-fine grain by dynamic recrystallization and dissolve of the carbide. The latter mechanism played a major role in refinement of grains.

关 键 词：高速车轮 轮缘 耐腐蚀白层 纳米晶结构 

分 类 号：U260.331.1[机械工程—车辆工程]