Thermodynamic Characterization in Intercritical Annealing Process for Dual-Phases Steels

Abstract:

The theoretical prediction of chemical composition, the range of main elements and austenite alteration affected by intercritical annealing temperature were conducted by thermodynamic calculations, which agree with the experimental results. When fixing carbon content at 0.1% and calculating temperature at 1000K, to achieve α+γ phases without cementite or graphite, Al must be less than 1.13%, Mn be 1.25~7.5% and Mo be less than 0.7%. The calculated Ae3 is 54°C higher than the measured Ac3, and calculated Ae1 is 14°C higher than Ac1. The intercritical annealing temperature for DP590 steels with Al as main alloying element can be calculated by setting ratios of α:γ in 70:30, and the calculated value of 807°C was close to the experimental results of 800~840°C.

• Periodical: Advanced Materials Research (Volumes 602-604)
• Pages: 452-455
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.602-604.452
• Online since: December 2012
• Authors: Fang Fang*, Hui Wang, Yun Yang Yin, Cheng Jiang Lin
• Keywords: Dual Phase Steel, Intercritical Annealing Temperature, Thermo-Calc Software

References

[1] D. A. F. Bayton and G. F. Fourlaris, Mater. Sci. Technol., Vol. 27 (2011), p.85.

[2] H. Mohrbacher and C. Klinkenberg, Mater. Sci. Forum, Vol. 537 (2007), p.679.

[3] Q. L. Yong, Editor, Secondary Phases in Steels, Metallurgical Industry Press, Beijing, (2006).

[4] J. D. Robson and P. B. Prangnell. Acta Mater., Vol. 49,(2001), p.599.

[5] V. Abouei, H. Saghafian and S. Kheirandish. J. Iron Steel Res. Int., Vol. 14 ( 2007), p.43.

[6] A. Nouri, H. Saghafian and S. Kheirandish. J. Iron Steel Res. Int., Vol. 17 (2010), p.44.

[7] C. I. Garcia. ISIJ Int., Vol. 51 (2011), p.969.

[8] M. A. Asadabad. ISIJ Int., Vol. 48 (2008), p.1251.