A model for description of structure forming processes during reheating steels for thermal treatment

Abstract

Modern production technologies, applied for parts or billets of steels for heat treatment, demand a possibility to predict the resulting and important structure parameters. The description of the austenite structure before transformation is also interesting for technologies with austenite transformation. A concept is presented to model austenitizing, including austenite nucleation, austenite nuclei growth and austenite grain growth. Monte‐Carlo‐Simulation is the mathematical method for modelling. The influence of secondary phases, especially the dissolution, is taken into account by using an additional part of the model. The mathematical method therefore is finite‐differences. Based on this concept, a model is developed for description of austenization during reheating. The variables for input are estimated at metallografical plane. Tests were carried out with case hardening steels and tempering steels. Austenite nuclide density and grain growth behaviour were estimated, both according to the initial state.