Frictional heat-induced phase transformation on train wheel surface
- 1 Downloads
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 °C, and the thickness of the martensite layer is decreased by 30%, which is helpful in reducing the thermal cycling fatigue of the train wheel tread such as spalling.
Key wordstrain wheel steel thermal cycling fatigue friction martensite transformation thermomechanical coupling
Unable to display preview. Download preview PDF.
- 1.XIAO Yan-jun. Test and Research for Speed-Raising on Existing Railways in China [J]. China Railway Science, 2000, 21 (1): 9.Google Scholar
- 2.SUN Jian. Progress in the Reduction of Wheel Spalling [A]. China Railway Society, eds. Proceedings of 12th International Wheelset Congress [C]. Qingdao: China Railway Society, 1998. 18.Google Scholar
- 3.Kисејіев C H. Reliability of the Mechanical Systems of Rail Transport [J]. VNIIZhT Bulletin, 1994, (7): 13 (in Russian).Google Scholar
- 4.ZHENG Wei-sheng, LIU Hui-ying. Several Problems About Wheel Tire Flat, Peeling and Counter Measures [J]. Rolling Stock, 2001, 39(2): 1.Google Scholar
- 6.Cole I S, Griffiths J R. Thermal Crashing of Railway Wheels [J]. Metallurgy Australas, 1985, 17(1): 14.Google Scholar
- 7.ZHANG Bin. Damage and Failure Analysis Gallery for Railroad Wheel and Tire [M]. Beijing: China Railway Publishing Company, 2002.Google Scholar