Effects of Al content on the high-temperature mechanical properties of Al-TRIP steel

摘要

As-cast transformation-induced plasticity (TRIP) steels with two different aluminium contents (2.80 and 6.75 wt-%) were subjected to investigate the effect of aluminium content on the tensile strength and hot ductility. As the Al content increases from 2.80 to 6.75 wt-%, the third brittle zone of the steel is shifted from 950-750 degrees C to 800-750 degrees C. The 6.75 wt-% Al-TRIP steel is a typical delta-TRIP steel that contains 44.5 wt-% delta-ferrite compared with no delta-ferrite in the 2.80 wt-% Al-TRIP steel. The solidification behaviour of these two types of TRIP steel was compared by calculating equilibrium phase diagrams. The 6.75 wt-% Al-TRIP steel was found to have better ductility than the 2.80 wt-% Al-TRIP steel below 1100 degrees C.