Tatarko I. An increase in stability of mechanical properties of iron-carbon alloys for production of railway wheels on the basis of specified regularities of structure formation by modification

Processes and mechanisms of structure formation and control of properties of products from iron-carbon alloys during modification. An increase in stability of the complex of mechanical and service properties of iron-carbon alloys for production of railway solid-rolled wheels by means of stabilization of chemical composition and controlled structure formation due to treatment by multicomponent modifiers. Chemical and spectral; optical and electron microscopy; X-ray, micro X-ray spectrum, neutron textural, fractal graphical analyses; mechanical testing. Experimental data processing by use of Statistica system. The regularities of structure formation in the process of ER7 steel crystallization due to modification by Al-Mg-Si-Ca-Ti, an impact of modification on the evolution of texture in ER7 steel wheels after thermal treatment applying the method of neutron textural analysis, the regularities of structure formation in the process of gray cast iron crystallization due to modification by Са-F-Al-Ti-Mg-Si-РЗМ system are identified for the first time; the concepts of influence of structural components on wheel steel impact toughness and structural components of gray cast iron on resistance of large-size moulds for steel ingots used for wheels production were developed further. The technology of producing iron-carbon alloys for wheels production with enhanced stability of mechanical properties was improved. Implemented: JSC Interpipe NTZ; the academic process at O. Gonchar DNU. Metallurgy and machine building