关键词:
Finite element method
摘要:
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. © 2012 IFSA.