| The computer simulation of microstructural evolution in hot rolling and the research of the relationship between microstructure and mechanical properties have been one of the hot topics in recent years .In this paper, combined with Q345E steel which made in WuHan Iron and Steel Company and based on those researches carried out in the laboratory, using the method of mathematical models combined with physical models to simulate the temperature change and microstructural evolution in the course of cooling after hot rolling. The factors which affect the microstructural evolution and mechanical properties were discussed and the final mechanical properties was predicted also. After referring to a large number of national and international articlespublished by numerous metallurgical workers and other co-workers'research results, Sun Yikang's models and Kazuyoshi ESAKA's Physical metallurgy models were selected as the basic models 'structure, and the group of models which used to simulate the temperature change and microstructural evolution were established and programed .The input date of the program are chemical composition and rolling parameters and the output data are the volume fraction of ferrite, pearlite, bainite and the ferrite grain size after Y - a transformation, as well as the mechanical properties. The data used to revise the models are acquired form the experiments that carried out by THERMECMASTOR - Z and the results of the mass production specimens' microstructural checking. The results of the calculation showed that using modelling program simulated the temperature change and microstructural evolution in the course of cooling after hot rolling and predicted Q345E steel's mechanical properties can get satisfied results. It can be developed into the on-lined control application. |
