EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

For long steel products, the microstructure components have a major importance to guarantee good mechanical properties. This paper will discuss how the type of bainite microstructure can affect the impact energy. For this purpose, two bainitic steel grades with different impact energy were compared in term of microstructure. Both steel microstructures was investigated in terms of morphology, size and area fraction of martensite austenite islands and in terms of bainitic ferrite misorientation angle distribution by EBSD analysis combined with SEM and image analysis. The results obtained from the EBSD analysis show that the change in impact energy is related to the type of bainite identified in the microstructure according to the misorientation distribution.