Abstract
In this work, theoretical modeling of the thermodynamic processes of the release of excess phases is carried out, as well as a practical study of the structure and distribution of chemical elements in carbides, depending on alloying using a scanning electron microscope. The obtained dependences were experimentally confirmed using X-ray spectroscopy on nickel-based superalloys. It is recommended to use the obtained mathematical models not only in the design of new nickel-based superalloys, but also in the improvement of known brand compositions within the declared concentrations.
Highlights
One of the main ways to improve the manufacturability of structures, the coefficient of metal utilization, and to reduce the labor intensity and energy consumption of products is the widespread use of welded structures [1-5]
Modeling the precipitation of phases in the process of crystallization of the investigated alloy in the temperature range (1600– 20°C) showed that the most probable is the precipitation of the main phases in the following order: - solid solution; primary carbides; eutectic + ; type intermetallic compound based on (Ni3Al)
It is shown that the temperature dependences change with the element content and closely correlate with the thermodynamic processes occurring in the system, that is, the curves exhibit extrema accompanying the change in the stoichiometry of carbides or the precipitation of new phases
Summary
One of the main ways to improve the manufacturability of structures, the coefficient of metal utilization, and to reduce the labor intensity and energy consumption of products is the widespread use of welded structures [1-5]. Welding of nickel alloys is associated with serious difficulties caused by their special physicochemical properties, namely, a great tendency to form porosity when welding nickel and nickel alloys. This is because in the molten state nickel-based alloys significantly increase the solubility of gases such as nitrogen, hydrogen, oxygen, and upon crystallization and cooling of the metal, their solubility in the alloy sharply decreases, which leads to the formation of pores 6-11. There is a high tendency of the metal to form crystallization cracks This is due to the formation of low-melting eutectics at the grain boundaries. The objective of this work is to study the specifics of the influence of alloying elements on the distribution of carbides in the structure, their topology, and morphology, as well as their composition for a multicomponent system such as Ni-34Cr4,3W-2,3Mo-1,3Al-1,3Ti-1,3Nb-0.1C using the computational prediction method CALPHAD (passive experiment) compared with data obtained by scanning electron microscopy (active experiment)
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