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Vol. 16, Special Issue, November 2012, pp. 43-51




FEM-based Simulation of Stress Distribution in U71Mn Heavy Rail during Quenching


Siqiang Xu, Jianyi Kong, Gongfa Li, Jintang Yang, Hegen Xiong
and Guozhang Jiang

College of Machinery and Automation,

Box 242, Wuhan University of Science and Technology, Wuhan, 430081, China

Tel.: +86-15927505887

E-mail: xusiqiang@yahoo.com.cn


Received: 11 September 2012   /Accepted: 11 October 2012   /Published: 20 November 2012

Digital Sensors and Sensor Sysstems


Abstract: Quenching is one of the crucial heat treatment processes for manufacture of components with desired mechanical properties. Success or failure of a quenching process is identified by arranging an appropriate technique. In this work, the quenching process of U71Mn heavy rails with different parameters including heating time, cooling time and air pressure was investigated. The stress distribution of the rail-ends during the quenching process was simulated by the finite element method. The equivalent heat capacity method which handles the effect of latent heat, that is, heat energy that the heavy rail releases during a phase change, on the temperature field, was utilized in the simulation computation, in addition to the equivalent linear expansion coefficient method which deals with the transformation stress introduced from a phase change. In the meantime, the effect of material’s non-linear parameters on the temperature field was taken into consideration. The research result indicates that the air-blast quenching introduces minor residual stress and avoids heavy rail’s deformation and cracking.


Keywords: Heavy rail, Quenching process, Finite element method, Stress distribution, Residual stress



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