Material-technological Modeling of Various Holding Times at the Partitioning Temperature in AHSS with Different Alloying Strategies

Abstract

New methods of heat treatment usually require precise control of processing parameters. Therefore, a new type of heat treatment, the Q-P (quenching and partitioning) process, was carried out on a thermomechanical simulator, which enables application of rapid and precisely controlled temperature and deformation load. The most important Q-P process parameters are quenching and partitioning temperatures and partitioning hold, which affect not only the fraction of retained austenite but also precipitation of carbides. Q-P strategies with different partitioning conditions were tested on three different high strength low alloyed steels with different contents of Mn and Si. Strength of over 2000MPa with a ductility A5mm of about 14% was obtained for the optimal combination of partitioning hold conditions.