Computer Simulation Of Temperature Field And Phase Transformation In Heat Treatment For Heavy Rail End

Recently, the Wuhan-Guangzhou high-speed rail is operating in the official opening ,which marks the Chinese railway operator has reached the world's fastest speed of the railway and largest technical in the world. Although our research has made some achievements, China's railway technology requires constant innovation to follow, to meet the rapid development of our economy constantly.Heat treatment of heavy rail heavy rail end plays an important position in the entire production process, which involves heat transfer, phase transformation kinetics of metal and other disciplines. Heat treatment of heavy rail most directly aimed at improving end after rolling the organization, to improve the strength and toughness of heavy rail, and also to prevent the formation of white spots inside, reducing internal stress, improve rail head surface hardness, increased wear resistance.In this paper,using the finite element method for heavy rail of heat treatment process of the computer simulation analysis.In thermal simulation test for U71Mn steel continuous cooling shift test, drew U71Mn steel continuous transition curve, and metallographic experiment by different cooling speed of the organization is analyzed.According to U71Mn steel thermal parameters, establish the finite element model of the treatment process of heavy rail end, using the model to calculate the transient temperature field of heavy rail and organizational changes, and then use computer graphics theory, combined with the heavy rail end cap shaped sample thermal simulation experiment control characteristics of the organizational changes, in the finite element software DEFORM-HT post-processing module of heavy rail in the temperature quenching process change and organizational change in the law. Finally,establish a heavy rail end cap heat treatment of new computer simulation technology,which provides a theoretical reference for the actual production process.The model is used to explain the corner effect of rail head, organizational simulation results show that the quenching organizations of cross section is smaller back-end granular pearlite (sorbite +troostite), no martensite, bainite and so on. The structure simulation results is compared with the experimental results and the Ministry of Railways standard, which receives very good results, which verifies the simulation of system reliability.