Recovery in 15%Cr Ferritic Stainless Steel after Large Strain Deformation

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15%Cr ferritic stainless steel was machined in rectangular samples and then processed by multiple forging to a total cumulative strain of 7.2 at an ambient temperature. The large strain deformation resulted in almost equiaxed submicrocrystalline structure with a mean grain/subgrain size of 230 nm and about 2.2×1014 m-2 dislocation density in grain/subgrain interiors. The annealing at a relatively low temperature of 500oC did not lead to any discontinuous recrystallizations. The grain/subgrain size and the interior dislocation density slightly changed to 240 nm and 2.1×1014 m-2, respectively, after annealing for 30 min, while the Vickers hardness decreased from 3140 MPa in the as-processed state to 2900 MPa. This annealing softening was attributed to remarkable release (by 50%) of internal stresses, which are associated with a non-equilibrium character of strain-induced grain/subgrain boundaries.

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Periodical:

Materials Science Forum (Volumes 558-559)

Edited by:

S.-J.L. Kang, M.Y. Huh, N.M. Hwang, H. Homma, K. Ushioda and Y. Ikuhara

Pages:

119-124

Citation:

A. Belyakov et al., "Recovery in 15%Cr Ferritic Stainless Steel after Large Strain Deformation", Materials Science Forum, Vols. 558-559, pp. 119-124, 2007

Online since:

October 2007

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$38.00

[1] H. Gleiter: Prog. Mater. Sci. Vol. 33 (1989), p.223.

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

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

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

[5] A. Belyakov, K. Tsuzaki, H. Miura and T. Sakai: Acta Mater. Vol. 51 (2003), p.847.

[6] A. Belyakov, Y. Kimura and K. Tsuzaki: Mater. Sci. Eng. A Vol. A403 (2005), p.249.

[7] A. Belyakov, T. Sakai, H. Miura and R. Kaibyshev: Phil. Mag. Lett. Vol. 80 (2000), p.711.

[8] R. Armstrong, I. Codd, R.M. Douthwaite and N.J. Petch: Phil. Mag. Vol. 7 (1962), p.45.

[9] Y. Bergstrom and H. Hallen: Metal Sci. Vol. 17 (1983), 341 d -0. 5 (m -0. 5) 200 240 1800 2000 2200 Hv (MPa) 1100 1150 2800 3000 3200 3400 Fe - 15%Cr ∆Hv = 190 MPa Hv = 910 + 0. 98 d -0. 5.

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