DEFORMATIONAL GRAIN GRINDING OF ALLOYED STEELS MICROSTRUCTURE AT NON-STATIONARY INTENSE PLASTIC DEFORMATION BY EXPLOSION
Abstract
Dependence of grain size of alloyed high-strength steels of austenitic, bainitic, maraging classes on temperature and degree of deformation at non-stationary intensive plastic deformation by explosion has been studied. A model which enables to calculate dispergating limit value considering dependence of coefficient of grain-boundary diffusion on degree of deformation and temperature is constructed. The results of calculations by the offered formula and their comparing to experimental data show satisfactory coincidence. A rejection is 3–5%. It is set that the intensive growing shallow under the action of high-speed flowage the explosion of alloyed high-strength steels takes place at the degrees of deformation 20–30%. Increase of degree of deformation to 30–40% does not cause the change of size of grain. At deformations more than 40–50% the accumulated flowage causes additional local warming-up of material and development of recrystallizational processes, sizes of grain increase as a result. At deformations higher 50–60% appearances of cracks in materials is possible.
About the Authors
A. Ph. Ilyuschenko
Powder Metallurgy Institute of the National Academy of Sciences of Belarus
Russian Federation
Сorresponding member Dr. Sc. (Engineering), Рrofessor, General Director of State Scientific and Production Assotiation of Powder Metallurgy (SSPA PM)
Russian Federation
Сorresponding member Dr. Sc. (Engineering), Рrofessor, General Director of State Scientific and Production Assotiation of Powder Metallurgy (SSPA PM)
I. V. Fomikhina
Powder Metallurgy Institute of the National Academy of Sciences of Belarus
Russian Federation
Ph. D. (Engineering), Senior Scientific Researcher, Head of metallophysics laboratory of SSI “Powder Metallurgy Institute”
Russian Federation
Ph. D. (Engineering), Senior Scientific Researcher, Head of metallophysics laboratory of SSI “Powder Metallurgy Institute”
M. M. Dechko
Belarusian State Agrarian Technical University
Russian Federation
Ph. D. (Engineering), Assistant Professor, the Department “Bases of scientific investigations and designing”.
Russian Federation
Ph. D. (Engineering), Assistant Professor, the Department “Bases of scientific investigations and designing”.
V. N. Kovalevskij
Belarusian National Technical University
Russian Federation
Dr.Sci. (Engineering), Professor of chair “Powder metallurgy, composite materials and coatings”
Russian Federation
Dr.Sci. (Engineering), Professor of chair “Powder metallurgy, composite materials and coatings”
References
1. Chuvil′deev, V. N., Kopylov, V. I., Nokhrin, A. V., Makarov, I. M. and Lopatin, Yu. G. (2004), ″Limit of dispersing at ECA-deformation. Influence of temperature″, Doklady Akademii Nauk [Paper of RAN], vol. 396, no. 3, рр. 332–338.
2. Chuvil′deyev, V. N. and Kopylov, V. I. (2004), ″Limit of grains crumbling at ECA-deformation″, Metally [Metals], no. 1, pp. 22–35.
3. Utyashev F. Z. (2009), ″Deformation methods of nanostructured materials production and possibilities of their utilization in air jet motors building″, Aviatsionno-kosmicheskaya tekhnika i tekhnologiya [Aviation and space technics and technologie], no. 10 (67), pp. 7–11.
4. Nokhrin, A. V., Chuvil′deyev, V. N., Kopylov, V. I., Lopatin, Yu. G., Pirozhnikova, O. E., Sakharov, N. V., Piskunov, A. V. and Kozlova, N. A. (2010), ″Correlation Hall – Petch in nano- and microcrystalline metals, produced by methods of intensive plastic deformation″, Fizika granits zeren v metallakh, splavakh i keramikakh. Vestnik Nizhegorodskogo universiteta im. N. I. Lobachevskogo [Physics of grains limits in metals, alloys and ceramics. News of Nizny Novgorod University of N. I. Lobachevsky], no. 5(2), pp. 142–146.
5. Chuvil′deyev, V. N. (2004), Neravnovesnye granitsy zeren v metallakh. Teoriya i prilozheniya [Non-equilibrium limits of grains in metals. Theory and additions], Physmatlit, Мoscow, RU.
6. Chuvil′deyev, V. N. (1996), ″Micro mechanism of deformation-stimulated grain- limit self diffusion″, Fizika metallov i metallovedenie [Physics of metals and metals science], vol. 81, no. 5, pp. 5–13.
7. Nokhrin, A. V. (2014), ″Experimental and theoretical investigations of sub-microcristalline metals evolution produced by method of intensive plastic deformation″, D. Sc. Thesis, Condensed Matter Physics, The Federal state autonomous educational institution of higher education ″Nizhny Novgorod State University. Lobachevskii″, N. Novgorod, RU.
8. Kaibysheb, O. A. and Utyashev, F. Z. (2005), ″Superplastisity: Microstructurial Refinement and Superplastic Roll Forming″, Futurepast. Arlington, VA22201 USA, p. 386.
9. Utyashev, F. Z. (2008), Sovremennye metody intensivnoi plasticheskoi deformatsii [Modern methods of intensive plastic deformation], USATU, Ufa, RU.
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