Дослідження технологічних параметрів процесу отримання чавунних виливків для роботи в умовах зношування

• Дата: 2023
• Автор: Лук’яненко, І.В.
• Формат: Стаття
• Мова: Українська
• Опубліковано: Physico-technological Institute of Metals and Alloys 2023
• Теми: абразивне зношування; білий чавун; високоміцний чавун з кулястим графітом; внутрішньоформове модифікування; двошаровий чавунний виливок; диференційовані властивості; лиття в піщано-глинисті форми; перехідна зона; реакційна камера; ударноабразивне зношування
• Онлайн доступ: https://www.metalsandcasting.com/index.php/mcu/article/view/152
• Назва журналу: Metal and Casting of Ukraine

The paper provides a detailed description of the state of the issue, which concerns the relevance of improving the wear resistance of machine and mechanisms parts operating under conditions of intense abrasive and impact-abrasive wear. The basic actual directions of the solution of this problem are stated. The advantages of using bimetals in the global and domestic practice are highlighted, and the main groups of methods that are characterized by common technological methods, production of bimetals and multilayer materials using casting technologies are given. Considered in detail the method of producing castings with different structures and properties in different parts of it from a cast iron melt of the same chemical composition for work under conditions of abrasive and impact-abrasive wear. Based on this method, studies of technological factors that affect the production of iron castings with differentiated properties, namely the time interval between the steps of pouring the mold, have been carried out. Based on the results of the primary experiment, a method of computer simulation of the processes of melt pouring and crystallization was applied, which, after additional mathematical processing, made it possible to determine the probable limits of the exposure time interval between the pouring. As a result of further experiments, the results of computer simulation were confirmed and the optimal time frames of the exposure interval under study were determined. The paper also presents data on structural components that were formed in different parts of the casting, including the transition zone between a layer of ductile cast iron and white cast iron. Data were obtained regarding the hardness of the working layer of the casting and the base layer, as well as the dimensions of the transition layer, which is formed when using the production technology under investigation, are established.