Abstract
In this paper, the DEFORM-3D finite element software is used to construct the models of temperature and microstructure fields of the 60AT rail during the air cooling process after rolling, with the distribution regularities of temperature and phase-transformation in air cooling analyzed. The computation results suggest that the temperature distribution along the cross section of the 60AT rail is significantly influenced by its rail web with great volume-to-surface-area ratio. At 150s during the air cooling process, there is no phase change on the cross section of the 60AT rail, with all phase that appears to be austenite. At 650s with the temperature dropped, the almost all the cross section of the rail has been turned into pearlite, with the changing rate of 97.2%. The pearlite phase change happens from the three edges of the railhead and the long and short wings of the rail flange to the railhead and the rail web, until the whole cross section of the rail is changed.
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