Simulation For The Austenite To Ferrite Transformation

A two-dimensional musicales cellular automaton model (2DCA) is developed to simulate the microstructure formed during the austenite to ferrite transformation in steels. The austenite to ferrite transformation at different isothermal temperatures in two low carbon steels of 0.1,0.15,0.2,0.25 is simulated using the present mode. Especially the grain from austenitic changes to the ferrite of the three stages: nuclear, Growth and coarse mixture of growth and proposed algorithm. Finally, a three-dimensional cellular automaton model (3DCA) is developed to simulate the microstructure formed during the austenite to ferrite transformation.The simulations show: Priority ferrites nucleate in austenite-ferrite interface, and while a small amount of ferrite grain within the austenite nucleation. With the extended holding time, Priority ferrites grow in austenite-ferrite interface. The simulations show: At a given isothermal temperature, the final volume fraction of ferrite grain is determinated by the average original growth rate of ferrite grain during the austenite to ferrite transformation in steels. The mean growth rate of ferrite grain increases and the simulated final ferrite volume fraction also increases. And the mean growth rate of ferrite grain is affected by percentage composition of carbon in steels during the austenite to ferrite transformation in steels. Percentage composition of carbon in steels increases and the mean growth rate of ferrite grain reduce. Because the percentage composition of carbon in 15SiMn steel is lower than 25SiMn steel, and the mean growth rate of ferrite grain in 15SiMn steel is faster than 25SiMn steel, the simulated final ferrite volume fraction increases.The simulation of mixed growth algorithm show: model is simplified and speed of the calculation is accelerated. The simulations of 3DCA show: Organizational evolution during the austenite to ferrite transformation. The initial irregular nature of austenite, grain nucleation of random features, and length large coarse ferrite for three- dimensional cellular automata 3DCA model are externalized. And three- dimensional cellular automata 3DCA model is exact.