|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals and Materials
||Phase Transformation Characterization by Means of High Temperature Digital Image Correlation for Graded Thermo-mechanical Processing of Steel Sheet Parts
||Alexander Reitz, Olexandr Grydin, Mirko Schaper
|On-Site Speaker (Planned)
By locally adjusting the microstructure during the press-hardening process, the production of load-tailored safety relevant parts is possible. The thermo-mechanical treatment of 22MnB5 steel at different austenitization temperatures, cooling and forming conditions within a sheet leads to the development of mixed microstructures, which locally influence the material properties. A high number of experiments and specimens are necessary to determine the resulting phase composition in such graded parts.
Within this study, a contactless characterization method to detect local phase transformations across an inhomogeneous treated flat steel specimen is developed. Digital image correlation and infrared thermography are used to identify transformation induced local straining during the inhomogeneous thermo-mechanical treatment. Flat steel specimens of 22MnB5 steel up to a thickness of 2 mm are tested. Coupling of temperature and strain fields enables the characterization of transformation kinetics for different austenitization temperatures, cooling rates and hot deformation strains with a reduced number of samples.