ФАКТОРИ ВПЛИВУ НА РОЗПОДІЛ ЧАСТИНОК ВАНАДІЮ В ЛИТИХ КОМПОЗИТАХ СИСТЕМИ Cu–V ЕЛЕКТРОННО–ПРОМЕНЕВОЇ ВИПЛАВКИ: Procesi littâ, 2023, Vol 3 (153), 61-74

• Дата: 2023
• Автори: Ліхацький, Р.Ф., Ворон, М.М., Матвієць, Є.О., Перехода, В.В.
• Формат: Стаття
• Мова: Ukrainian
• Опубліковано: National Academy of Sciences of Ukraine, Physical-Technological Institute of Metals and Alloys of NAS of Ukraine 2023
• Теми: сплави Cu―V; литі композити; електронно-променева ливарна технологія; математичне та комп’ютерне моделювання
• Онлайн доступ: https://plit-periodical.org.ua/index.php/plit/article/view/207
• Назва журналу: Casting Processes

In recent years, the world has raised interest in production of structural and functional materials with increased operational properties. In particular, an important technological direction is the creation of cast composite materials. An example of this is vanadium-hardened copper. Such a composite has almost the same electrical conductivity as pure copper, but is characterized by much higher strength and creep resistance. At the same time, the production of such and similar materials is a complex technological problem, therefore electron-beam casting technology was chosen to solve it. This method ensures the best preparation of melts of the Cu-V system. However, their casting and subsequent crystallization require studies of technological parameters in order to ensure the smallest size and the most uniform distribution of reinforcing particles. Thus, using the methodsof mathematical and computer modeling, the changes of studied system cast composites thermal state of castings was investigated, depending on the chemical composition and temperature of the melt. The theoretical dependences of the vanadium particles distribution in copper castings during pouring and cooling were studied. It was found, that convective flows under the condition offilling in the center in cylindrical castings lead to the movement of particles until the moment of their solidification along a spiral trajectory relative to the axis of the casting with a change in direction, depending on the configuration of the temperature fields. The speed of crystallization is of primary importance, since during prolonged cooling, spiral convective flows are replaced by longitudinalvertical flows along the axial center of the casting, as in the field with the highest temperature. It was also investigated, that most uniform deposition of V particles may be obtained due to its low concentration around 0.5 wt. %.