Magnitogorsk State Technical University (Magnitogorsk, Russia):

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

The article presents the results of integrated studies of the influence of chemical composition and temperature conditions of molded metal cooling on phase composition, structure, wear-resistance, heat-resistance (scaling-resistance and growth-resistance), and mechanical properties of white cast irons of the Cr-Mn-Ni-Ti system. An FFE 25-2 fractional factorial experiment has been designed and carried out to determine rational contents of C, Cr, Mn, Ni and Ti providing peak heat-resistance. An optimal composition of heat and wear-resistant white cast iron has been identified. The authors have studied the structure of surface oxide layers and distribution of elements between alloy microconstituents and on the oxidation surface. The chemical composition of oxide and sub-oxide layers of cast irons has been explored. The authors have found that the alloy composition and cooling conditions dictate the distribution of elements in the layer depth. Scaling-resistance tests have facilitated identification of different types of cast iron oxide layers. The article demonstrates that the primary cast structure of cast irons with the same chemical composition effects the constitution of oxide layers. Whereas, the oxide film composition depends on the distribution of alloying elements in the surface layer of cast irons. Since the change of a solidification cooling speed effects the eutectic quantity and density, chemical composition of a basic metal, carbides, and eutectic, the scaling-resistance, thus, depends on the molded metal cooling conditions as well as the alloy chemical composition.

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