Papers by Keyword: Spheroidite

Abstract: The austenitization is a solid phase transformation process accompanied by nucleation and nucleus growth controlled by long-range carbon diffusion. In the course of our work, a method was developed by which spheroidite model structures were constructed such a way that their different parameters (the size of ferrite grains, the average value of carbon concentration, the size of cementite spheroids) could be changed optionally. In addition, a nucleation model of free enthalpy base was created by which the difference between the two different places of nucleation can be distinguished on the basis of their free enthalpy. The effects of structure parameters, interface free enthalpies and temperature on the nucleation rate of austenite were investigated by cellular automaton simulations.

Abstract: Our aim was to develop initial structures similar to the real structures of unalloyed steels that could later be used for simulating austenitization. Both simple models and models that can be compared to the real structures were developed. In our paper, it is described how the initial structures were developed by using digitalized microscopic images.