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Evolution of grain–subgrain structure and carbide subsystem upon annealing of a low-carbon low-alloy steel subjected to high-pressure torsion

  • Structure, Phase Transformations, and Diffusion
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Abstract

The effect of annealing on the evolution of an ultrafine-grain structure and carbides in a 06MBF steel (Fe–0.1Mo–0.6Mn–0.8Cr–0.2Ni–0.3Si–0.2Cu–0.1V–0.03Ti–0.06Nb–0.09C, wt %) has been studied. The grain–subgrain structure (d = 102 ± 55 nm) formed by high-pressure torsion and stabilized by dispersed (MC, M 3C, d = 3–4 nm) and relatively coarse carbides (M 3C, d = 15–20 nm) is stable up to a temperature of 500°C (1 h) (d = 112 ± 64 nm). Annealing at a temperature of 500°C is accompanied by the formation in regions with a subgrain structure of recrystallized grains, the size of which is close to the size of subgrains formed by high-pressure torsion. The average size and distribution of dispersed particles change weakly. The precipitation hardening and the increase in the fraction of high-angle boundaries in the structure cause an increase in the values of the microhardness to 6.4 ± 0.2 GPa after annealing at 500°C as compared to the deformed state (6.0 ± 0.1 GPa). After 1-h annealing at 600 and 700°C, the microcrystal size (d = 390 ± 270 nm and 1.7 ± 0.7 μm, respectively) increases; the coarse M 3C (≈ 50 nm) and dispersed carbides grow by 5 and 8 nm, respectively. The value of the activation energy for grain growth Q = 516 ± 31 kJ/mol upon annealing of the ultrafine-grained steel 06MBF produced by high-pressure torsion exceeds the values determined in the 06MBF steel with a submicrocrystalline structure formed by equal-channel angular pressing and in the nanocrystalline α iron.

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Authors and Affiliations

  1. Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, pr. Akademicheskii 2/4, Tomsk, 634055, Russia

    G. G. Maier, E. G. Astafurova, E. V. Melnikov & E. V. Naydenkin

  2. Novosibirsk State Technical University, ul. K. Marksa 20, Novosibirsk, 630073, Russia

    A. I. Smirnov & V. A. Bataev

  3. Central Research Institute of Building Structures, Vtoraya Institutskaya ul. 6, Moscow, 109428, Russia

    P. D. Odessky

  4. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskii pr. 49, Moscow, 119991, Russia

    S. V. Dobatkin

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  1. G. G. Maier
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Correspondence to G. G. Maier.

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Original Russian Text © G.G. Maier, E.G. Astafurova, E.V. Melnikov, A.I. Smirnov, V.A. Bataev, E.V. Naydenkin, P.D. Odessky, S.V. Dobatkin, 2016, published in Fizika Metallov i Metallovedenie, 2016, Vol. 117, No. 11, pp. 1140–1150.

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Maier, G.G., Astafurova, E.G., Melnikov, E.V. et al. Evolution of grain–subgrain structure and carbide subsystem upon annealing of a low-carbon low-alloy steel subjected to high-pressure torsion. Phys. Metals Metallogr. 117, 1101–1110 (2016). https://doi.org/10.1134/S0031918X16110090

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