Scientific and Education Center “Welding and Control” of Bauman Moscow State Technical University (Moscow, Russia):
N. V. Kobernik, Dr. Eng., e-mail: koberniknv@bmstu.ru
A. S. Pankratov, Cand. Eng.

Bauman Moscow State Technical University (Moscow, Russia), Chair for Rocket and Space Engineering Technologies, Moscow, Russia:
V. V. Petrova, Post-graduate Student, “Technology of Aerospace Engineering” Dept.
M. A. Aleksandrov, Engineer, “Technology of Aerospace Engineering” Dept.

The article is devoted to studying the possibility of introducing chromium carbides into molten metal. To obtain abrasion-resistant coatings, iron-based welding materials with such main alloying elements as chromium and carbon are most widely used. The amount of alloying elements is selected so that chromium carbides are formed in the structure of the deposited metal. Therefore, when considering the possibility of introducing chromium carbides into the molten metal, it is need to consider the thermodynamics of the formation of these carbides in the Fe – Cr – C system. Based on an analysis of the literature thermodynamics of the formation of chromium carbides in the Fe – Cr – C system, it was found that these carbides are mainly formed in the temperature range in which the alloy is in the solid state. The formation of chromium carbides from the melt is not thermodynamically favorable, but the formation of carbides is possible only with a high carbon content (more than 40%). Experimental studies were carried out in which chromium carbide powders Cr₃C₂ were introduced into the weld pool melt, while protecting the carbide from direct arc exposure. It was found that chromium carbide when it enters the melt of the weld pool is completely destroyed. This process is accompanied by saturation of the metal with chromium and an increase in its hardness.

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