Kyryliuk Y. Patterns of phase and structure formation and properties of powder wear-corrosion-resistant materials based on the high chromium steel- -carbon ferrochrome system

The work is devoted to solving the urgent scientific and technical development problem and to study the conditions for the production, structure and properties of powder composite materials based on the functional high-carbon ferrochrome system. In this connection, a study was made of the influence of sintering temperature and alloying additives on the features of structure formation and the main physical, mechanical, tribotechnical and functional properties of chromium carbidesteels. In the work on the basis of a mixture of iron powders and high-carbon ferrochrome, chromium carbide steel was obtained, the influence of the component composition of the initial charge on the structural features, phase composition and properties of the composite was established. The paper investigates the effect of alloying additives - borides Ni and Ti, on the features of structure formation and properties during sintering of chromium carbidesteels. It is shown that boride additives lead to an improvement in the tribotechnical characteristics of composites, while improving the wear resistance of the material by a factor of 1.8-2.5 in comparison with the unalloyed composite. Additions of titanium diboride due to the formation of complex iron-chromium carboborides and double titanium-chromium diboride lead to an increase of 10-13% between the flexural strength and 4-5 times - the corrosion resistance of the composite. A technological scheme for the manufacture of powder chromium carbide steel was developed using the vacuum sintering method, and pilot production tests of samples of products from it were carried out. Recommendations on effective industries using developed materials were issued. Keywords: carbidesteels, highcarbon ferrochrome, sintering, strength, hardness, wear resistance, corrosion resistance.