Demakov S.L.,Ural Federal University |
Vodolazskiy F.V.,Ural Federal University |
Vodolazskiy V.F.,JSC VSMPO AVISMA Corporation |
Popov A.A.,Ural Federal University
Ti 2011 - Proceedings of the 12th World Conference on Titanium | Year: 2012
The problem of retention non-recrystallized grains elongated along rolling direction during processing of sheets of alloy TS6 (Ti-11Cr-5Mo-6V-3A1) exists for long time. By means of m etallographic, texture analyses and EBSD method, the formation and the retention of such grains was shown to be connected with texture inhibition. A number of features affecting on texture inhibition were characterized and classified. Main technological approaches to eliminate mentioned above non-recrystallized grains during the processing of sheet semi products were developed. These approaches made possible to obtain sheets with fine structure (D < 100 mkm) and high strength ratio in heat treated conditions.
Krasheninin A.G.,RAS Institute of Metallurgy |
Khalezov B.D.,RAS Institute of Metallurgy |
Vatolin N.A.,RAS Institute of Metallurgy |
Bornovolokov A.S.,JSC vSMPO AVISMA Corporation
Tsvetnye Metally | Year: 2013
Russia is one of the leading countries in reserves of vanadium, which is included into the composition of titanomagnetite ores. Vanadium concentrate (technical vanadium pentoxide with 80-90% content of basic substance) and ferrovanadium are only produced in Russia. Metallurgical slags from titanomagnetite smelting, containing vanadium and manganese, are raw materials for these products manufacturing. Russian titanium industry covers its own requirements in pure vanadium pentoxide and manganese through import of these materials. The new technology of pure vanadium pentoxide production from manganese vanadium-containing slags was developed in the Institute of Metallurgy of the Ural Branch of Russian Academy of Sciences. Production of vanadium pentoxide and manganese with increased purity, as well as ecological aspects and complex usage of raw materials, are considered to be the fundamental conditions for new technology development. The oxidized roasting at T = 850 °C without any Ca-and Na-containing additions is adopted in the technology of manganese vanadium slags processing in distinction to other existing technologies. Vanadium selective leaching in strong solutions of soda (ash) is made at the first stage of processing to obtain vanadium pentoxide of 99.6-99.8% purity. At the second stage, manganese is extracted via sulphate leaching from residues (cakes) after vanadium leaching. Manganese solution is obtained as a result of the operations of the mother liquor cleaning with removal of impurities. Manganese oxides of increased purity are precipitated from this. The obtained vanadium pentoxide and manganese oxides can be used in smelting of vanadium- and manganese-containing alloying compositions for production of titanium and aluminium alloys. The solid residues are used in ferroalloys production and in construction industry. Hence the new technology of manganese converter slags processing is claimed as ecological clean one and can provide the complex usage of raw materials. This technology can also meet the requirements of Russian titanium and aluminium industries in vanadium-and manganese-containing alloying additives.