Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia:

V. M. Kolokoltsev, Dr. Eng., Prof., Rector
E. V. Petrochenko, Dr. Eng., Prof., e-mail: evp3738@mail.ru
O. S. Molochkova, Cand. Eng., Associate Prof.

The paper presents the results of complex investigations of influence of chemical composition and metal cooling rate in a mould on phase composition, structure, wear resistance and mechanical properties of white vanadium cast iron. The technique has been developed for examination of amount and structure of excessive phases and eutectics; it includes determination of parameters of special carbides VC, (Ti,V)C on metallographic samples before pickling and examination of structure of binary and ternary eutectics — on metallographic samples after pickling. The fractional factorial experiment of DFE 25-2 kind has been planned and undertaken for determination of rational carbon, vanadium, copper, titanium and boron content providing maximal wear resistance. Optimal composition providing maximal wear resistance of complex-alloyed vanadium cast iron in different conditions of abrasive wear are defined. Regularities of influence of chemical composition, temperature conditions of metal cooling in a mould and processing on structure, morphology, phase chemical composition, mechanical properties, wear resistance of complex-alloyed vanadium white cast iron have been established. Influence of cooling rate in a mould and additional alloying on vanadium critical concentration has been defined, as well as influence of cooling conditions on C, V, Cu, Ti and B concentration intervals, providing equal level of mechanical properties and wear resistance. The kinds of eutectics and basic structural types, forming in white vanadium cast iron, have been determined on the base of the results of investigation.

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