Effect of Annealing on the Microstructure Evolution and Mechanical Properties of Dual Phase Steel

Abstract:

The aim of present article was to consider the influence of annealing parameters on evolution of microstructure and mechanical properties of dual phase steel. Dual phase steel was annealed according to the three chosen cycles of annealing: into intercritical region (780°C), into austenite region (920°C) and into austenite region (920°C) by subsequently cooling into intercritical region (780°C) with the hold at the temperature of 495°C. Tensile tests of the heat-treated specimens were carried out. The obtained microstructure consists from three phases: ferritic matrix, austenite and martensite. Nanoindentation experiments were performed with the peak load of 19.62 mN for ferrite grains and 0.981 mN for austenite and martensite grains, using a Berkovich tip as an indenter. The nanohardness for ferrite and martensite was 2.5 ±1 GPa and 7.1 ±1 GPa and for austenite the nanohardness varied from 4.1 to 4.5 GPa.

• Periodical: Materials Science Forum (Volume 782)
• Pages: 111-116
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.782.111
• Online since: April 2014
• Authors: Martin Šebek*, Peter Horňak, Peter Zimovčák
• Keywords: Annealing Simulation, Color Etching, Dual Phase Steel, Mechanical Property, Microstructure, Nanoindentation Method

References

[1] International Iron and Steel Institute, Committee on Automotive Applications, Advanced High Strength Steel (AHSS), Application Guidelines 4. 1 [online]. Available online at: <http: /www. worldautosteel. org>.

[2] R. O. Rocha, T. M. F. Melo,E. V. Pereloma, D. B. Santos, Materials Science and Engineering A, Vol. 391, p.296, (2005).

[3] O. Kwon,K. Lee, G. Kim,K. Chin, New Trends in Advanced High Strength Steel Developments for Automotive Application. Materials Science Forum, Vols. 638-642, pp.136-141, (2010).

DOI: 10.4028/www.scientific.net/msf.638-642.136

[4] B. Demir, M. Erdogan, J. Mater. Process. Technol., Vol. 208, p.75, (2008).

[5] Q.G. Meng, J. Li, J. Wang, Z.G. Zhang, L.X. Zhang, Mater. Des., Vol. 30, p.2379, (2009).

[6] L. Gao, Q. Song, J. Yuan, Effect of Continuous Annealing Parameters on the Microstructure and Magnetic Property of Cold Rolled Dual Phase Steel, Advanced Materials Research, Vols. 476-478, pp.241-247, (2012).

DOI: 10.4028/www.scientific.net/amr.476-478.241

[7] C. Ma, D. L. Chen, S. D. Bhole, G. Boundreau, A. Lee, E. Biro, Materials Science and Engineering A., Vol. 485, p.334, (2008).

[8] K. Shuang, K. Yonglin, Y. Hao, L. Rendong, Y. Ling, Iron and Steel., Vol. 42, p.65, (2007).

[9] G.B. Li, Z.Z. Zhao, D. Tang, Microstructure Evolution and Mechanical Properties of 780 MPa Hot Dip Galvanized Dual-Phase Steel, Advanced Materials Research, Vols. 146-147, pp.1331-1335, (2011).

DOI: 10.4028/www.scientific.net/amr.146-147.1331

[10] I. Hrivňák, Theory of weldability of metals and alloys, 1st. ed., (1992).

[11] M. Delincé, P.J. Jacques, T. Pardoen, Separation of Size-Dependent Strengthening Contributions in Fine-grained Dual Phase Steels by Nanoindentation., ActaMaterialia, Vol. 54, p.3395–3404, (2006).

DOI: 10.1016/j.actamat.2006.03.031