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Effect of Intercritical Annealing Temperature on Martensite Amount for Dual-Phases Steel

The theoretical prediction of intercritical annealing temperature for DP steels was conducted by thermodynamic calculation, which agreed to the experimental results. When annealed at 800°Caccording to the calculated temperature of 807°C by setting ratios of α:γ in 70:30, the amount of martensite was 13~18% and the mechanical properties achieved DP590 grade. There was at least 10% to 12% austenite transformed to new ferrite and martensite between intercritical annealing and overaging procedure.