Optimalization cooling temperature during heat treatment of closed die-forgings with amount of manganese and sillicon – POSTER

Bublíková Dagmar - ZČU Ostrava (Czech Republic)

Heat treatment of forgings that do not have a constant cross section is technically complicated. The problem is often the different cooling of the surface and in the interior of the forging and thus the different mechanical properties. One of the methods of heat treatment, which can be developed in laboratory conditions and thus optimize a number of parameters, is the Q-P process (Quenching and Partitioning). This process is characterized by rapid cooling from the heating temperature to the cloud point, which lies between the Ms and Mf temperatures and subsequent heating and endures at the redistribution temperature, which stabilizes the residual austenite, which contributes to increasing toughness. By this procedure it is possible to obtain strength limits higher than 2000 MPa with elongation over 10 %.
First, a real process of heat treatment of die forgings on experimental steels with a manganese content of 2.5 % was performed. Due to the higher manganese content, the Mf temperature was reduced to 78 °C, and therefore cooling from the austenitizing temperature to the cloud point could be performed in boiling water. The yield
Keywords: closed die-forgings, Q-P process, retained austenite, thermomechanical simulator, material technological modeling

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