Obrabotka Metallov 2013 No. 1

ОБРАБОТКА МЕТАЛЛОВ № 1 (58) 2013 47 ИССЛЕДОВАНИЯ ПО ФЦП Thermal stability of ultrafine-grained structure produced by equal channel angular pressing in Fe-Mn-V-Ti-0.1C and Fe-Mo-Nb-V-0.1C low-carbon steels with various phase composition G.G. Mayer, E.G. Astafurova, S.V. Dobatkin, E.V. Naydenkin, V.S. Koshoina, A.Yu. Chumachenko, N.S. Belousova The influence of annealing at 300-700 °С on microstructure and phase composition of low-carbon steels with ultrafine-grained structure produced by equal channel angular pressing from various initial states (ferritic-pearlitic, martensite, ferrite) was investigated. The ultrafine-grained structure possesses a high thermal stability up to 500 °С. The kinetic of grain growth under annealing was studied and activation energy for grain growth (303÷420 kJ/mol) of steel investigated was estimated. Key words: low-carbon steel, ultra-fine grained steel, equal channel angular pressing, thermal stability, car- bides. 2. Nanomaterials by severe plastic deformation, NanoSPD5 (ed. by J. T. Wang, R.B. Figueiredo, and T. Langdon ) – Switz.: Trans Tech Publ. Ltd, 2011 – P. 1224. 3. Горелик С.С., Добаткин С.В., Капуткина Л.М. Рекристаллизация металлов и сплавов – М.: МИСиС, 2005. – С. 432. 4. Dobatkin S.V., Odessky P.D., Shagalina S.V. Ultrafine grained low carbon steels processed by severe plastic deformation // Mat. Sci. Forum. – 2008. – V. 584- 586. – P. 623–630. 5. Park K.-T., Shin D . Annealing behavior of submicrometer grained ferrite in low carbon steel fabricated by severe plastic deformation // Mat. Sci. Eng. A.–V. 334.– 2002.– P. 79–86. 6. Park K.-T., Shin D.H., Lee J.G. et al Thermal stabil- ity and mechanical properties of ultrafine grained low car- bon steel // Mat. Sci. Eng. A.–V. 293. –2000. – P. 165–172. 7. Астафурова Е.Г., Захарова Г.Г., Найден- кин Е.В. и др . Особенности микроструктуры и ме- ханическое поведение стали 06МБФ после равно- канального углового прессования // Письма о мате- риалах. – 2011. – Т. 1. – С. 198–202. 8. Астафурова Е.Г., Захарова Г.Г., Найденкин Е.В. и др . Влияние равноканального углового прессования на структуру и механические свойства низкоугле- родистой стали 10Г2ФТ // ФММ. – 2010. – Т. 110. – № 3. – С. 275–284. 9. Han B.Q., Lavernia E.J., Mohamed F.A. Mechanical properties of iron processed by severe plastic deformation // Metall. and Mat.Trans. A. –2003. – V. 34. – P. 71–83. 10. Горелик C.C. Рекристаллизация металлов и сплавов. – М.: Металлургия, 1967. – C. 403. 11. Malow T.R., Koch C.C. Grain growth in nano- crystalline iron prepared by mechanical attriction // Acta mater. – V. 45, N. 5. – P. 2177–2186.