The Evolution of Structure and Mechanical Properties of Fe-Mn-V-Ti-0,1C Low-Carbon Steel Subjected to Severe Plastic Deformation and Subsequent Annealing

Abstract:

The present work deals with the evolution of mechanical properties and structure of low-carbon Fe-1,12Mn-0,08V-0,07Ti-0,1C (wt.%) steel after severe plastic deformation (SPD) and high-temperature annealing. Steel in initial ferritic-pearlitic state was deformed by equal channel angular pressing (ECAP) at T=200°C and high pressure torsion (HPT) at room temperature. The evolution of ultrafine grained structure and its thermal stability were investigated after annealing at 400-700°C for 1 hour. The results shown that SPD leads to formation of structure with an average size of (sub-) grain of 260 nm after ECAP and 90 nm after HPT. Ultrafine grained structures produced by SPD reveal a high thermal stability up to 500°C after ECAP and 400°C after HPT. At higher annealing temperatures a growth of structural elements and a decrease in microhardness were observed.

• Periodical: Materials Science Forum (Volumes 667-669)
• Pages: 325-330
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.667-669.325
• Online since: December 2010
• Authors: Galina G. Maier, Elena G. Astafurova, Evgeny V. Naydenkin, Georgy I. Raab, Sergey V. Dobatkin
• Keywords: Carbide, Equal-Channel Angular Pressing (ECAP), Ferrite, High Pressure Torsion (HPT), Low Carbon Steel, Pearlite, Recrystallization

References

[1] R.Z. Valiev, I.V. Alexandrov: Bulk Nanostructured Metallic Materials (IKC Akademkniga, Moskow 2007, in Russian).

[2] Nanomaterials by Severe Plastic Deformation, Ed. by Yu. Estrin, H.J. Maier (Trans. Tech. Publications, Switzerland, UK, USA, 2008).

[3] P. Wang, K.S. Kumar: Mater. Sci. and Eng. A. Vol. 519 (2009), p.184–197.

[4] S.V. Dobatkin, O.V. Rybalchenko, G.I. Raab: Mater. Sci. and Eng.A. Vol. 463 (2007), pp.41-45.

[5] P. Hirsch, A. Howie, R. B. Nicholson, D. W. Pashley, and M. J. Whelan, in: Electron Microscopy of Thin Crystals (Krieger, Huntington, New York 1977).

[6] E.G. Astafurova, S.V. Dobatkin and : Mater. Sci. Forum Vol. 584-586 (2008), pp.649-654.

[7] E.G. Astafurova, S.V. Dobatkin, E.V. Naydenkin, S.V. Shagalina, G.G. Zakharova, Y.F. Ivanov: Nanotechnologies in Russia Vol. 4, Nos. 1–2, (2009), pp.109-120.

DOI: 10.1134/s1995078009010121