| In recent years, with the rapid development of computer technology and the great research progress of material science, the computer simulation of microstructural evolution in hot rolling has been one of the hot topics in metal material processing.In this paper, the XER70S-6 steel is researched in the laboratory,based on the method of mathematical models that are combined with physical models to simulate the microstructural evolution in the course of cooling after hot rolling. Besides,the factors that effect the microstructural evolution are discussed.According to the pratical produce technic, the hot process simulation experiment is carried out in the machine of THERMECMASTOR-Z,which is followed by the metal-phase anolyze experiment .The austenitic transformation is studied,which is based on theory of hot-bulge,and the curve of CCT for the steel is protracted.The microstructure of the samples are determined in the microscope. According to the data from these experiments and referring to a large number of national-international articles written by numerous metallurgical workers'research results, the microstructural evolution models,which are based on the XER70S-6 steel,are established,and a sery of simulation programme is compiled.The input data of the programme is the grain sizes of austenite and the cooling rate ,and the output data includes the beginning temperature, the volume fraction of ferrite,pearlite,the grain size of ferrite after austenite transformation,and so on. In this paper,the simulating calculation results are in good agreement with experiment values,which shows that this research work is of a certain theory and application values.
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