The behaviour of heterophase inclusions “high-melting phase surrounding with low-melting cover” under steels pressure forming

Abstract

Purpose. It is necessary to study of the effect of heterophase inclusions on the technological ductility of steels for various purposes. The goal of the work was to study the plasticity level of heterophase inclusions “high-melting phase surrounded with low-melting cover” during the processing of steels by pressure.Methods. Comprehensive methods for the study of heterophase non-metallic inclusions (metallographic, petrographic, X-ray microanalysis methods) were used. Results.It was found that heterophase inclusions “high-melting phase surrounded with low-melting cover” have different structures and phase compositions. The features of the plastic behavior of various phases in inclusions “high-melting phase surrounded with low-melting cover” with various combinations of phases were shown. The interaction of phases in the inclusions during the processing of steel by pressure was analyzed.Scientific novelty.The special features of the plastic behavior of heterophasic ones were identified, including the “high-melting phase, surrounded with low-melting cover” with steel sampling with a vice. It was shown that the process development of interphase rubbing at the boundaries of the included-matrix and at the internal boundaries of the inclusions was shown. The inverse phase inclusion at the third stage of deformation was presented. The possibility of transforming the inclusion of a “high-melting phase, surrounded with low-melting cover” in the process of hot and cold deformation when machining steel with a vice is shown. Practical significance.The results obtained will allow developing technologies for producing steels with regulated content and types of heterophase non-metallic inclusions, which will significantly increase their technological plasticity, as well as prevent the formation of various kinds of defects during the processing of steels by pressure.