A complete method for rheological characterization of steel at high temperature

MINES-ParisTech, CEMEF, UMR CNRS 7635, Sophia Antipolis, France

Abstract

For finite elements modelling of industrial process, like welding solidification or heat treatment, a good knowledge of behaviour at high temperature is crucial. In this paper, in one hand a coupled electrical-thermal and mechanical is proposed and in other hand strain field measurement with non intrusive techniques is needed in order to characterize the behaviour of steels at high temperatures and when subjected to small displacements. The displacement field measurement is based on laser-produced speckles coupled with a cross-correlation cross-spectrum method. And the finite element model is able to modelize a resistance heating tensile test. Application on two different steel grades is considered. Numerical model has been compared with electrical and thermal measurements. The proposed method can be used to define the optimal sample geometry and as an important achievement, can be viewed for further inverse modelling identification methods.