Research into hot ductility of high aluminium dual phase steel

Abstract

Hot tensile tests of two dual phase steels with different aluminium contents were performed using a Gleeble 2000 thermal simulator. The effect of Al on hot ductility is discussed. The experiment results indicated that the filmy and meshy ferrite which generated along the austenite grain boundary during the transformation from austenite to ferrite were the main cause of the decrease in hot ductility. The start transformation temperature from austenite to ferrite occurred at a higher temperature with the addition of Al increased from 0⋅03 to 0⋅9%. As a result the ductility trough shifted to a higher temperature range 800–1020°C, compared to 710–920°C for the 0⋅03%Al steel.