Дослідження процесів диференціації структури чавунних виливків методом комп’ютерного моделювання

• Дата: 2023
• Автор: Лук’яненко, І.В.
• Формат: Стаття
• Мова: Українська
• Опубліковано: Physico-technological Institute of Metals and Alloys 2023
• Теми: біметалеві виливки; абразивний та ударно-абразивний знос; двошарові чавунні виливки; лиття в піщано-глинисті форми; комп'ютерне моделювання; крива охолодження; зовнішній холодильник; глибина вибілення; високоміцний чавун; критична швидкість охолодження
• Онлайн доступ: https://www.metalsandcasting.com/index.php/mcu/article/view/142
• Назва журналу: Metal and Casting of Ukraine

The main options for improving the operational life of parts of high-loaded working bodies of machines and mechanisms of grinding and other processing of mineral raw materials, working in conditions of abrasive and impact-abrasive wear and ways to improve their production technologies are presented, which are based on using properties of such a class of materials as bimetals. The effectiveness of the use of modern methods of computer simulation of castings crystallization is shown. The possibility of using data obtained by computer simulation to determine the cooling rate at any point of the casting has been established. Using the example of high-strength cast iron with spherical shape of graphite, obtained by spheroidizing modification in the reaction chamber of a mold with a known critical cooling rate, exceeding of which leads to a change in its crystallization path from a stable system to a metastable and, as a result, to chilling, calculations are made that allow us to predict the depth of the chilled cast iron layer, depending on the given technological factors of the casting process. An explanation is given that the use of the obtained data of modeling and calculations can be applied to specify the required depth of the working chilled layer of cast iron parts at the stage of their production, which, in turn, will provide more optimized performance properties. The paper shows the results of experimental studies of the technology for producing castings, which combine the structure of high-strength cast iron in the base material and white cast iron in their working part. A comparison of the results of these studies with the results of computer simulation and calculations is made, which confirms their convergence.