Кафедра ливарного виробництва чорних та кольорових металів

Національний технічний університет України "КПІ ім. Ігоря Сікорського"

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Mykhailo M. Yamshinskij, Grigoriy E. Fedorov, Nataliya V. Yamshinska The Effect of Carbon, Titanium and Rem on Oxidation Resistance of Cr-Al Steels

Mykhailo M. Yamshinskij, Grigoriy E. Fedorov, Nataliya V. Yamshinska The Effect of Carbon, Titanium and Rem on Oxidation Resistance of Cr-Al Steels

The aim of the work is to determine the influence of carbon, titanium and REM ( rare earth metals ) on oxidation resistance of Cr-Al steels. The negative impact of high concentration of carbon on performance characteristics of steels under examination has been established. To provide the target time of service the concentration of chrome, aluminium, carbon and titan is recommended. It has been found, that small additions of REM substantially improve the quality of coupling of oxide films with the surface of the basis of metal. The exceedence of the set number results in early destruction of protective oxide layers and decrease of pieces’ service time. The studies of oxide films have examined the possibilities of changing the compositions and structure of phases of oxides in the system, that confirms the fact that at high temperatures in an oxidizing environment the stable phases of oxides are rhombohedral phases, rather than spinel structures. By results of research, a mathematical model, which allows to forecast performance characteristics of pieces depending on titan and carbon content, was calculated.

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