Austenite Reverse Transformation in a Q&P Route of Mn and Ni Added Steels
Maribel Arribas (Tecnalia, Basque Research and Technology Alliance (BRTA))
Teresa Gutiérrez (Tecnalia, Basque Research and Technology Alliance (BRTA))
Eider Del Molino (Tecnalia, Basque Research and Technology Alliance (BRTA), University of the Basque Country)
Artem Arlazarov (ArcelorMittal Maizieres Research )
Irene De Diego-Calderón (ArcelorMittal Maizieres Research )
David Martin (Swerim)
Daniele De De Caro (Centro Ricerche Fiat)
S. Ayenampudi (TU Delft - (OLD) MSE-3)
Maria Jesus Santofimia (TU Delft - (OLD) MSE-3)
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Abstract
In this work, four low carbon steels with different contents of Mn and Ni were heat treated by quenching and partitioning (Q&P) cycles where high partitioning temperatures, in the range of 550 °C–650 °C, were applied. In order to elucidate the effect of applying these high partitioning temperatures with respect to more common Q&P cycles, the materials were also heat treated considering a partitioning temperature of 400 °C. The microstructure evolution during the Q&P cycles was studied by means of dilatometry tests. The microstructural characterization of the treated materials revealed that austenite retention strongly depended on the alloy content and partitioning conditions. It was shown that the occurrence of austenite reverse transformation (ART) in the partitioning stage in some of the alloys and conditions was a very effective mechanism to increase the austenite content in the final microstructure. However, the enhancement of tensile properties achieved by the application of high partitioning temperature cycles was not significant.
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