Using the computer simulation program ProCAST, the analysis of the processability of the gating system used in the current production of the SK “Foundry-Mechanical Factory” in the manufacture of large cast parts of railway rolling stock was performed. Based on computer modeling, a new design of a gating system with a dispersed metal motive with different sizes of feeder sections was developed, providing simultaneous parallel filling of all parts of the mold cavity. The feature of the proposed design of the gating system is the presence of an extended horizontal collector and the supply of metal to the end parts of the casting. With this design, two counter-flows are formed in the mold cavity, their fusion occurs in the middle part of the casting in a cooled and highly polluted state, since during the filling process, the head part of the flow collects sand inclusions along the way, is oxidized and saturated with hydrogen. These factors are a prerequisite for the formation of various defects in castings.

The molding sands composition research of various compositions has been carried out. Quantitative dependences of the influence of additives on the physical and mechanical properties of core mixtures are obtained.

The problem of increasing the competitiveness of technology today is largely determined by the quality of manufacturing large-sized cast billets for their supporting systems. Many factors are involved in forming the service properties of a casting. Each factor is important and affects the quality of the resulting casting. The presence of "cold" slag does not allow refining processes to be fully realized during the induction melting of steel. Therefore, attempts to achieve the same results for induction melting steel without additional furnace treatment as for electric arc melting steel do not always lead to success. In recent years, various methods of out-of-furnace steel processing have been developed, which make it possible to eliminate certain disadvantages of induction melting. One of them is the modification of steel in the bucket with rare earth metals (REM). Additional modification of steel in the ladle along with REM also allows for further improvement of steel quality. Currently, REM, with a high affinity for oxygen, sulfur, nitrogen, non-ferrous metals, and other impurities, are widely used in the steel production. Studies have been carried out to improve the technology of out-of-furnace steel processing and its mechanical properties. The effect of alkaline earth and rare earth master alloys on impact strength and the contamination index with non-metallic inclusions of cold-resistant steel is shown.

The method of electron-microscopic analysis investigated the structure of the alloy Ti-50.2 at % Ni at different stages of dissolution; low-temperature thermomechanical treatment (LTTT), post-deformation edgy (PDE), and recrystallization. The microstructure of B2-austenite, which is formed in the process of incoordination, was also investigated, including in the conditions of isothermic burning of the original recrystallized structure.

Отправка автору номера почтового отправления: 14.05.2024 Публикация на сайте статей и журнала: 27.04.2024 Статьи принимаются: до 15.04.2024 (включительно) Выходные данные статьи и справка о публикации: в день оплаты статьи Рассылка печатных журналов и оттисков: 07.05.2024