Obrabotka Metallov 2013 No. 4

ОБРАБОТКА МЕТАЛЛОВ № 4 (61) 2013 34 МАТЕРИАЛОВЕДЕНИЕ Received 23 October 2013 Revised 10 November 2013 Accepted 15 November 2013 Abstract The medium, in which the heat treatment of metallic alloys is carried out, largely determines its parameters such as temperature and time of exposure, as well as the properties of the final product . The state that the activity of the internal diffusion process is closely related to the diffusion of hydrogen and is therefore dependent on the composition ratio and the ambient pressure of hydrogen within the metal in the furnace atmosphere is explained in the article. The results of the study of the influence of different mediums with a high content of hydrogen on the parameters of hardening, aging and mechanical properties of industrial cast and wrought aluminum alloys are adduced. The following mediums were used for heating: powders of oxides, hydrocarbon vapours, carbamide. It is shown that holding of aluminum alloys in mediums with a high content of hydrogen and nitrogen, that promotes the phase transformation and contributes to a significant reduction in the time of heat treatment. For example, while heating of carbamide decomposition products, the aging time reduces 2-4 times while increasing the strength and ductility. Keywords: aluminum alloys, environment, hydrogen, heat treatment, mechanical properties. References 1. Kolobnev I.F. Termicheskaja obrabotka aljuminievyh splavov [Heat treatment of aluminum alloys]. Moscow, Metallurgija, 1966. 394 p. 2. Karpenko G.V. Vlijanie sredy na prochnost’ i dolgovechnost’ metallov [Effect of temperature on the strength and durability of metal]. Kiev, Naukova dumka, 1976. 124 p. 3. Afanas’ev V.K., Abramov A.A. Osobennosti struktury splavov Al–Mg s titanom i cirkoniem [Struc- ture of Al−Mg alloys with titanium and zirconium]. Metallovedenie i termicheskaja obrabotka metallov - Metal Science and Heat Treatment , 1977, no. 6, pp. 18-20. 4. Afanas’ev V.K. Fizika i himija obrabotki materialov , 1977, no. 4, pp. 16-17. 5. Afanas’ev V.K., Lebedev V.N., Mel’gunov A.A. Vodorodnaja hrupkost’ aljuminija i ego splavov [Hy- drogen brittleness of aluminum and its alloys]. Moscow, CNII informacii, 1984. 332 p. 6. Afanas’ev V.K., Popova M.V., Ushakova V.V. Izvestija vysshih uchebnyh zavedenij. Chernaja metal- lurgija , 1995, no.10, pp. 45-47. 7. Jevans U. O mehanizme himicheskogo rastreskivanija [On the mechanism of chemical cracking]. Ko- rrozionnoe rastreskivanie i hrupkost’: sbornik nauchnyh trudov [Stress corrosion cracking and brittleness: Collection of proceedings]. Moscow, Metallurgizdat, 1961, pp. 149-155. 8. Афанасьев В.К., Прудников А.Н., Попова М.В., et al. Izvestija vysshih uchebnyh zavedenij. Cher- naja metallurgija , 2005, no. 6, pp. 36–39. 9. Афанасьев В.К., Долгова С.В., Лаврова Н.Б. Obrabotka metallov (tehnologija, oborudovanie, in- strumenty) , 2009, no. 3, pp. 3–8. 10. Fromm E., Gebhardt E., eds. Gase und Kohlenstoff in Metallen (Gases and Carbon in Metals ) . Ber- lin, Springer-Verlag, 1976. 636 p. (Russ. ed.: Fromm E., Gebhardt E. Gazy i uglerod v metallah . Moscow, Metallurgija, 1980. 712 p.