Abstract
To predict phase equilibria of advanced high strength steels accurately, a new multicomponent thermodynamic database (FEDA) encompassing Fe, C, Mn, Si, Al and Ni is created according to relevant literatures. This study applies Thermo-Calc software to estimate phase transformation temperatures and phase fractions in ferrite and austenite two-phase region of test steels. Simultaneously, experiments are carried out with dilatometer and the quantitative metallographic analysis technology. It is found that the FEDA database is appropriate for predicting A1 temperature and phase fractions of Al-containing steels at low temperatures, while the TCFE6 database can be used to estimate A3 temperature. According to calculated phase fractions using FEDA database, a two-step heat treatment is made in order to achieve TRIP-aided steels. Samples annealed at 780°C for 3 min and held at 420°C for 5 min exhibit an optimum value of strength and ductility product up to 23690 MPa·%.
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