LAUSR

Modification of high-manganese steel castings in the mold by titanium carbonitride is investigated. First, the basic principles of alloying and modification of cast alloys are outlined, and the relevant literature is reviewed. That provides the basis for formulating the research goals. The practical significance of the research for casting enterprises is confirmed. Next, the materials employed are considered in detail: the batch components, the modifier, the materials used in the casting molds. Likewise, the experimental methods are described: in particular, the methods used in producing experimental castings and in determining the thermal conditions in the mold and the optimal heat treatment. In addition, the metallographic techniques employed are noted. The experimental results regarding the modification of the steel casting by fine titanium-carbonitride powder in the mold are presented. The influence of such modification on the performance of the high-manganese steel is considered, in terms of improved abrasive and impact–abrasive wear resistance. Metallographic data explain the basis for the improved performance of the high-manganese steel. The influence of the thermal conditions in the mold is considered: in particular, the influence of the rate of alloy cooling in the mold on the performance of the modified high-manganese steel. Finally, on the basis of the research findings, recommendations are made for improving the performance of cast high-manganese steel products. In addition, recommendations are made regarding the optimal consumption of titanium-carbonitride powder so as to obtain the required microstructure and properties of the high-manganese steel.