Features of Obtaining Titanium Alloys of Ti−Al−Si−Zr−Mo−Nb−Sn System under Conditions of Electron-Beam Foundry Technology
Processy litʹâ, 2020, Tom 140, №2, p.8-14
DOI:
https://doi.org/10.15407/plit2020.02.008Keywords:
heat resistant titanium alloys, Ti–Al–Si–Zr–Mo–Nb–Sn system, electron-beam foundry technology, casting of titanium and its alloysAbstract
Recieved 04.05.2020
UDC 669.295:621.9.048
The article is devoted to the problem of obtaining a heat-resistant complex alloyed titanium alloy of Ti–Al–Si–Zr system additionally alloyed with Molibdanium, Niobium and Stannum under the conditions of electron-beam foundry technology. On the basis of current trends in the development of heatresistant titanium alloys, an analysis of compositions development for operating at temperatures of 600 °C and potentially capable for operating at temperatures up to 700 °C has been performed. It is concluded that the well-known commercial alloys, which are implement the mechanism of solution hardening, as well as alloys based on intermetallic have a number of disadvantages and do not fully meet the current requirements for this class of materials. It is shown that the development and creation of titanium alloys, which can combine the mechanisms of solution and silicidal hardening is the most promising solution for a significant increase of their high temperature characteristics. One example of such a group of alloys is the composition Ti–7Al–1Si–4Zr–1Mo–1Nb–1Sn, developed at IPM NAS of Ukraine. Such an alloy is not too costly and somewhat lighter than its existing counterparts. The production of finished and semi-finished from such alloys is usually carried out by casting methods or by metallurgical electron-beam melting technology.
From the view point of such alloys experimental nature, there is a need to study the technological features of smelting such material, determine the behavior of components in the melting process and melt preparation, obtain high-quality workpieces for further thermomechanical processing and research. To solve these problems, the most appropriate is the use of electron-beam foundry technology. In the course of the experimental alloy smelting experiments, melt preparation of the required chemical composition technological features were identified, among which the main ones were the procedure for aluminum addition and the mixing of elements with high density.
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Copyright (c) 2020 С. В. Ладохін, М. М. Ворон, Є. О. Дрозд, Є. О. Матвієць, *Л. Д. Кулак, *М. М. Кузьменко
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