High-Temperature Salt Corrosion of a Heat-Resistant Nickel Alloy

Kvasnytska, Yu. H.; Іvas’kevych, L. М.; Balyts’kyi, O. I.; Maksyuta, I. I.; Myal’nitsa, H. P.

doi:10.1007/s11003-020-00447-5

Cited by 16 publications

(21 citation statements)

References 4 publications

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“…(calibration factor 5 was determined empirically) for evaluating the mechanical properties, which takes into account the complex effect of the main components of the alloy. Since the dimensional mismatch of the lattice parameters is associated with the degree of concentration solid solution hardening of the γ-and γ′-phases, the efficiency of precipitation hardening of the alloy, the creep rate, and other properties, the Kγ′ ratio allows us to associate these properties with multicomponent systems [1][2][3][4][5][6][7][8][9][10].…”

Section: Research Results and Discussionmentioning

confidence: 99%

“…The development of new and optimization of existing alloys for cast parts, namely, the most heavily loaded, such as the working and nozzle blades of a gas turbine engine, is a material science, design and technological task that requires a comprehensive solution [1][2][3][4]. For modern thermally stressed gas turbine engines, the above-mentioned complex-profile parts are made from multicomponent heat-resistant alloys based on nickel, cobalt and iron by the methods of equiaxed, directional or monocrystalline casting [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Properties of nickel-based superalloys of equiaxial crystallization

Глотка¹,

Ольшанецкий²

2021

НМТ

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Purpose. The aim of the work is to obtain predictive regression models, with the help of which, it is possible to adequately calculate the mechanical properties of nickel-based superalloys of equiaxial crystallization, without carrying out preliminary experiments. Research methods. To find regularities and calculate the latest CALPHAD method was chosen, and modeling of thermodynamic processes of phase crystallization was performed. Results. As a result of experimental data processing, the ratio of alloying elements Kg¢ was proposed for the first time, which can be used to assess the mechanical properties, taking into account the complex effect of the main alloy components. The regularities of the influence of the composition on the properties of heat-resistant nickel alloys of equiaxial crystallization are established. The analysis of the received dependences in comparison with practical results is carried out. The relations well correlated with heat resistance, mismatch and strength of alloys are obtained. Scientific novelty. It is shown that for multicomponent nickel systems it is possible with a high probability to predict a mismatch, which significantly affects the strength characteristics of alloys of this class. The regularities of the influence of the chemical composition on the structure and properties of alloys are established. A promising and effective direction in solving the problem of predicting the main characteristics of heat-resistant materials based on nickel is shown Practical value. On the basis of an integrated approach for multicomponent heat-resistant nickel-based alloys, new regression models have been obtained that make it possible to adequately predict the properties of the chemical composition of the alloy, which made it possible to solve the problem of computational prediction of properties from the chemical composition of the alloy. This allows not only to design new nickel-based alloys, but also to optimize the composition of existing brands.

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Section: Research Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Properties of nickel-based superalloys of equiaxial crystallization

Глотка¹,

Ольшанецкий²

2021

НМТ

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“…Assume that the considered rod is homogeneous and of constant cross-section. Then for the numerical solution we assume the following initial data [1,2,[17][18][19][20][21][22]: Based on the initial data we have:…”

Section: S a =mentioning

confidence: 99%

“…T into the second equation of the system (18) we obtain that Вестник Карагандинского университета From (19) we find the temperature value of the first node, which corresponds to the cross section of the left end of the rod, where part of the area is subjected to heat flow and the right part is subjected to heat exchange: .…”

Section: S a =mentioning

confidence: 99%

Finite element modeling of heat propagation of a complete rod of constant cross-section

Kenzhegulov¹,

Kenzhegulova²,

Alibiyev³

et al. 2022

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In this paper, the definition of the temperature distribution field for a rod made of heat-resistant alloy EI48 is introduced. The authors consider for the study a complete rod of circular cross-section of radius R, of limited length L. Studied body is under the influence of a heat flow q from the surface over the entire cross-sectional area of the left end, and heat exchange with the environment occurs on the cross-sectional area of the right end. The rod is thermally insulated along the side surface. The authors consider two cases: the first is the heat flow with intensity q can be set on the area of a small circle with radius r <R, the second is the heat flow can be set on its part, that is, on the area 2 2   R     . During the study, the authors showed that during the thermomechanical process, the strength of each section of the load-bearing structural elements is significantly influenced by the temperature distribution field. The influence of high temperature on the morphology of heat-resistant alloys is also shown. This leads to the fact that in some parts of the structural elements the temperature will be acceptable, and in some — critical. As a result, rapid wear of structural elements and loss of their physical qualities occur. Therefore, mathematical modeling of temperature distribution field for a body of various configurations is an urgent problem. The article presents a method for constructing a mathematical model and a corresponding computational algorithm that allows solving a class of problems to determine the regularities of the temperature distribution field in the elements of rod-shaped structures. To do this, the authors used the energy-variation principle in combination with the finite element method.

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“…This circumstance has significantly simplified the system for alloying superalloys for growing single crystals. In addition, using the anisotropy of physical and mechanical properties, it is possible to choose such a rational orientation of the single crystal (axial or azimuthal) relative to the direction of action of the main stresses, which would provide the best mechanical properties and the maximum service life of the product [7][8][9][10][11][12][13].…”

mentioning

confidence: 99%

Influence of Alloying Elements on Composition of Primary Carbides in Ni–11.5Cr–5Co–3.6Al–4.5Ti–7W–0.8Mo–0.06C System

Ol'shanetskii¹,

Глотка²

2022

Metallofiz. Noveishie Tekhnol.

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In this work, theoretical modelling of the thermodynamic processes of the release of excess phases is carried out using the CALPHAD method. As well as a practical study of the structure and distribution of chemical elements in carbides, depending on alloying using scanning electron microscopy. It has been established that in typical carbides, for the system Ni-11.5Cr-5Co-3.6Al-4.5Ti-7W-0.8Mo-0.06C, there is a tendency to degeneration and phase reactions depending on the level of alloying with the given elements. The mathematical dependences of the influence of alloying on the temperature of precipitation (dissolution) of carbides and the change in the chemical composition of the alloy on the content of elements in carbides are established. The obtained dependences were experimentally confirmed using scanning electron microscopy on nickel-based superalloys.

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High-Temperature Salt Corrosion of a Heat-Resistant Nickel Alloy

Cited by 16 publications

References 4 publications

Properties of nickel-based superalloys of equiaxial crystallization

Properties of nickel-based superalloys of equiaxial crystallization

Finite element modeling of heat propagation of a complete rod of constant cross-section

Influence of Alloying Elements on Composition of Primary Carbides in Ni–11.5Cr–5Co–3.6Al–4.5Ti–7W–0.8Mo–0.06C System

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