|GOLAB Rafal||AGH University of Science and Technology|
|Spoluautoři MADEJ Lukasz|
Development of reliable material models for metal forming simulations has been in interest of scientists for a number of years. The main difficulty in modeling of metal forming operations is to realistically describe the phenomena occurring in materials at lower length scales under the complex conditions of deformation and to incorporate this into the continuum based approaches, as many of micro scale phenomena are stochastic in nature. Mentioned facts led to development of discrete modeling methods e.g. Monte Carlo (MC), Cellular Automata (CA) etc. dealing with micro scale material behavior. These methods are then usually combined with conventional macro scale analysis techniques such as Finite Element (FE) method and a multi scale analysis tool can be created. Thus the main goal of the present research is development of the complex micro scale austenite to ferrite transformation model during continuous cooling based on Cellular Automata method. The proposed model predicts phase transformation progress starting from the two-phase region rather than only from a full austenitic range. Theoretical background of the implemented austenite–ferrite phase transformation model is shown in the present paper. The defined transition rules for initiation and subsequent growth as well as internal variables for each particular CA cell are also presented. Finally examples of results obtained from the developed model as well as its capabilities are discussed.