Особливості технологічного процесу виготовлення двошарових чавунних виливків з диференційованими властивостями: Processy litʹâ, 2019, Tom 134, №2, p.15-20

• Дата: 2019
• Автор: Лук’яненко, І. В.
• Формат: Стаття
• Мова: Ukrainian
• Опубліковано: National Academy of Sciences of Ukraine, Physical-Technological Institute of Metals and Alloys of NAS of Ukraine 2019
• Теми: абразивне зношування; білий чавун; внутрішньоформове графітизуюче модифікування; двошаровий чавунний виливок; диференційовані властивості; лиття в піщано-глинясті форми; перехідна зона; реакційна камера; сірий чавун
• Онлайн доступ: https://plit-periodical.org.ua/index.php/plit/article/view/138
• Назва журналу: Casting Processes

Received 15.03.2019 UDK 621.74 A brief review of the class of construction materials is presented as materials with differentiated properties, the tendency of which in industry is constantly increasing. Their main properties, their areas of application and advantages in use are given. On the basis of the proposed technology for producing castings with differentiated properties from cast iron, an analysis of the process parameters is carried out. The basic principles of the technology of the inmold modification and the choice of the granulometric composition of the modifier and the general configuration of the gating system are described. The conditions and results of the experiment to work out the technological parameters of the process of obtaining a cast-iron two-layer casting with differentiated properties for working in abrasive conditions are presented. The parameters of the technological process are established under which the required microstructure and mechanical properties are obtained in the casting, namely the creation of such conditions under which, after the first casting stage, cast iron crystallizes in a metastable system with chilling in the working casting layer, after the second stage of casting, – in a stable system with the formation of the microstructure of gray iron with inclusions of lamellar graphite. With the help of metallographic analysis, transition zones, which are formed at the junctions of the cast iron layers, and the layers themselves, namely their sizes, the morphology of graphite and cementite inclusions, and the metal matrix, are investigated. The mechanical properties of the structural components were established both in the transition zone and in each layer separately, and their number in the same parts of the casting was also established.