A THERMO-METALLURGICAL MODEL FOR STEEL COOLING BEHAVIOR - PROPOSITION, VALIDATION AND COMPARISON WITH THE SYSWELDS MODEL

The aim of this work is to include the metallurgical behaviour of stee ls (and specifically their phase transformations) into thermo-mechanic al studies. In this purpose, a new model of anisothermal phase transfo rmations during the cooling stage is proposed. Developed in the thermo dynamics framework of simple materials with memory variables, its orig inality lies in the choice of the temperature time derivative T as an independent variable. The identification and the transformation rates computation use the CCT diagrams which are considered as families of p articular solutions of evolution equations. The validation shows abili ty of the model to simulate all CCT deductible tests. Furthermore, for some tests not included into the CCT the numerical results remain goo d and the model, from which evolution equation form as been let free, allows to incorporate them to the identification data without modifyin g the CCT simulation accuracy. Lastly, for all the previous tests, thi s model has been compared with the one of the Sysweld software.