Frictional Heat-Induced Phase Transformation on Train Wheel Surface
Frictional Heat-Induced Phase Transformation on Train Wheel Surface作者机构：Division of Structural Material Research Central Iron and Steel Research Institute Beijing 100081 China Ma＇anshan Iron and Steel Company Limited Ma＇anshan 243000 Anhui China
出 版 物：《Journal of Iron and Steel Research International》 (J. Iron Steel Res. Int.)
年 卷 期：2008年第15卷第5期
页 面：49-55页
核心收录：
学科分类：082304[工学-载运工具运用工程] 08[工学] 080204[工学-车辆工程] 0802[工学-机械工程] 080101[工学-一般力学与力学基础] 0823[工学-交通运输工程] 0801[工学-力学（可授工学、理学学位）]
基 金：High-Tech Research and Development Programof China (863 Program) (2006AA03Z514 and 2008AA030703)
主 题：train wheel steel thermal cycling fatigue friction martensite transformation thermomechanical coupling
摘 要：By combining thermomechanical coupling finite element analysis with the characteristics of phase transformation [continuous cooling transformation （CCT） curve], the thermal fatigue behavior of train wheel steel under high speed and heavy load conditions was analyzed. The influence of different materials on the formation of the phase transformation zone of the wheel tread was discussed. The result showed that the peak temperature of wheel/track friction zone could be higher than the austenitizing temperature for braking. The depth of the austenitized region could reach a point of 0.9 mm beneath the wheel tread surface. The supercooled austenite is transformed to a hard and brittle martensite layer during the following rapid cooling process, which may lead to cracking and then spalling on the wheel tread surface. The decrease in carbon contents of the train wheel steel helps inhibit the formation of martensite by increasing the austenitizing temperature of the train wheel steel. When the carbon contents decrease from 0.7% to 0.4%, the Ac3 of the wheel steel is increased by 45 ℃, and the thickness of the martensite layer is de creased by 30 %, which is helpful in reducing the thermal cycling fatigue of the train wheel tread such as spalling.
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