The Simulation Of A Nb-steel's Microstructural Changes During Hot Working And The Prediction Of Mechanical Properties

Computer modeling of microstructural changes and the relationships between mechanical properties of hot rolled steel products has been under active development in the research community. Through the computer-aided simulation for steel's microstructural changes and prediction for mechanical properties, it meets the necessary for product's variety and good quality. This method can simplify the design of metallurgy, improve the productivity, reduce the cost of manufacture, and enhance the product's quality.Firstly, temperature distribution through the thickness is calculated using the finite difference method (FDM). Then several metallurgical models are raised aimed at a Nb steel. The models describe quantitatively the transformation behaviors during hot working and cooling, such as recrystallization, grain growth, precipitation and phase transition from austenite to ferrite. It also clarifies the relations existing among the processing condition, microstructure and final mechanical properties. The contrast between these results coming from a simulator for hot working, the factory and computer's calculation indicates that this method through the computer aided simulation for steel's microstructure's changes and prediction for mechanical properties is fairly economic, very precise and feasible method. It can be developed into the on-line control application.