Experimental precision study of types and of the chemical composition of nonmetallic inclusions in radial section of the railway axis by the method of the electronic microscopy and x-ray spectral microanalysis

Abstract

Purpose. Investigation of the structure and composition of non-metallic inclusions in the radial section of the draft railway axis obtained from continuously cast billets. Methodology. Studies were conducted on samples of steel EA1N using electron microscopy of X-ray spectroscopy analysis. Results. It has been established that during cooling of the melt and crystallization of the metal of a continuously cast billet, inclusions close in composition to quasi-equilibrium states of binary and ternary oxide systems are formed. Originality. The structures and composition of heterophase inclusions formed in the central part by spinel MgO * Al2O3 with the (Ca, Mn) S sulfide phase shell are identified. Practical value. The results of the study determine the modes of deoxidation and alloying of the axial metal during out-of-furnace treatment at LF and VD.