On Structural Mechanism of Continuous Recrystallization in Ferritic Stainless Steel after Large Strain Processing

Abstract:

The annealing behaviour of an Fe – 22%Cr – 3%Ni ferritic stainless steel processed by bar rolling/swaging to total strain of 4.4 at an ambient temperature was studied in the temperature range of 400 ~ 700oC. The annealing behaviour was characterised by the development of continuous recrystallization involving recovery processes followed by a normal grain growth. The large strain deformation caused the very fast recovery resulting in the development of almost equiaxed polygonized microstructure in place of the highly elongated deformation (sub)grains. The polygonization development was accompanied by some increase in the transverse (sub)grain size and the formation of many low-angle subboundaries. The latter ones could be composed from the dislocations, which were emitted by the strain-induced deformation (sub)boundaries. In spite of relatively large fraction of low-angle subboundaries, such polygonized microstructure was essentially stable against a discontinuous grain coarsening. Upon further annealing, therefore, the microstructure evolution was considered as a normal grain growth.

• Periodical: Materials Science Forum (Volumes 503-504)
• Pages: 323-328
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.503-504.323
• Online since: January 2006
• Authors: Andrey Belyakov, Yuuji Kimura, Kaneaki Tsuzaki
• Keywords: Ferritic Stainless Steel (FSS), Fine Grained Microstructure, Recovery, Recrystallization, Severe Plastic Deformation (SPD)

References

[1] R.Z. Valiev, R.K. Islamgaliev and I.V. Alexandrov: Progr. Mat. Sci. Vol. 45 (2000), p.103.

[2] Y. Kimura and S. Takaki: Mater. Trans. JIM Vol. 36 (1995), p.289.

[3] Y. Iwahashi, Z. Horita, M. Nemoto and T.G. Langdon: Acta Mater. Vol. 45 (1997), p.4733.

[4] Y. Saito, N. Tsuji, H. Utsunomiya, T. Sakai, and R.G. Hong: Scripta Mater. Vol. 39 (1998), p.1221.

[5] A. Belyakov, T. Sakai, H. Miura and K. Tsuzaki: Phil. Mag. A Vol. 81 (2001), p.2629.

[6] Z.G. Liu, H.J. Fecht, Y. Xu, J. Yin, K. Tsuchiya and M. Umemoto: Mater. Sci. Eng. Vol. A362 (2003), p.322.

[7] F.J. Humphreys, P.B. Prangnell, J.R. Bowen, A. Gholinia and C. Harris: Phil. Trans. R. Soc. Lond. Vol. 357 (1999), p.1663.

[8] A. Belyakov, T. Sakai, H. Miura, R. Kaibyshev and K. Tsuzaki: Acta Mater. Vol. 50 (2002), p.1547.

[9] A. Belyakov, Y. Sakai, T. Hara, Y. Kimura and K. Tsuzaki: Mater. Trans. Vol. 45 (2004), p.2252.

[10] Yu. Ivanisenko, R.K. Wunderlich, R.Z. Valiev and H. -J. Fecht: Scripta Mater. Vol. 49 (2003), p.947.

[11] R. Ueji, N. Tsuji, Y. Minamino, and Y. Koizumi: Sci. Technol. Adv. Mater. Vol. 5 (2004), p.153.

[12] A. Belyakov, Y. Kimura and K. Tsuzaki: Mater. Sci. Eng. A (submitted).

[13] A. Oscarsson, H. -E. Ekstrom, and B. Hutchinson: Mater. Sci. Forum Vol. 113-115 (1993), p.177.

[14] A. Belyakov, Y. Kimura, Y. Adachi and K. Tsuzaki: Mater. Trans. Vol. 45 (2004), p.2812.

[15] A.E. Romanov and V.I. Vladimirov: Dislocation in Solids, Vol. 6, F.R.N. Nabarro, ed. (Elsevier Science, 1992), p.191.

[16] A. Belyakov, T. Sakai and H. Miura and R. Kaibyshev: Scripta Mater. Vol. 42 (2000), p.319.

[17] M. Yu. Gutkin, I.A. Ovid'ko and N.V. Skiba: Mater. Sci. Eng. Vol. A339 (2003), p.73.

[18] W.T. Read and W. Shockley: Phys. Rev. Vol. 78 (1950), p.275.