Отправить статью по E-mail Evolution of grain–subgrain structure and carbide subsystem upon annealing of a low-carbon low-alloy steel subjected to high-pressure torsion
- Авторы: Maier G.G.1, Astafurova E.G.1, Melnikov E.V.1, Smirnov A.I.2, Bataev V.A.2, Naydenkin E.V.1, Odessky P.D.3, Dobatkin S.V.4
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Учреждения:
- Institute of Strength Physics and Materials Science, Siberian Branch
- Novosibirsk State Technical University
- Central Research Institute of Building Structures
- Baikov Institute of Metallurgy and Materials Science
- Выпуск: Том 117, № 11 (2016)
- Страницы: 1101-1110
- Раздел: Structure, Phase Transformations, and Diffusion
- URL: https://journals.rcsi.science/0031-918X/article/view/166405
- DOI: https://doi.org/10.1134/S0031918X16110090
- ID: 166405
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Аннотация
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, M3C, d = 3–4 nm) and relatively coarse carbides (M3C, 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 M3C (≈ 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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Об авторах
G. Maier
Institute of Strength Physics and Materials Science, Siberian Branch
Автор, ответственный за переписку.
Email: galinazg@yandex.ru
Россия, pr. Akademicheskii 2/4, Tomsk, 634055
E. Astafurova
Institute of Strength Physics and Materials Science, Siberian Branch
Email: galinazg@yandex.ru
Россия, pr. Akademicheskii 2/4, Tomsk, 634055
E. Melnikov
Institute of Strength Physics and Materials Science, Siberian Branch
Email: galinazg@yandex.ru
Россия, pr. Akademicheskii 2/4, Tomsk, 634055
A. Smirnov
Novosibirsk State Technical University
Email: galinazg@yandex.ru
Россия, ul. K. Marksa 20, Novosibirsk, 630073
V. Bataev
Novosibirsk State Technical University
Email: galinazg@yandex.ru
Россия, ul. K. Marksa 20, Novosibirsk, 630073
E. Naydenkin
Institute of Strength Physics and Materials Science, Siberian Branch
Email: galinazg@yandex.ru
Россия, pr. Akademicheskii 2/4, Tomsk, 634055
P. Odessky
Central Research Institute of Building Structures
Email: galinazg@yandex.ru
Россия, Vtoraya Institutskaya ul. 6, Moscow, 109428
S. Dobatkin
Baikov Institute of Metallurgy and Materials Science
Email: galinazg@yandex.ru
Россия, Leninskii pr. 49, Moscow, 119991
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