Distribution of Elements in Carbides of Multicomponent Superalloys

Глотка, А. А.; Haiduk, S. V.

doi:10.15407/mfint.42.06.0869

Cited by 9 publications

(5 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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“…The fracture mechanics approach to the operation of turbine unit rotor shafts includes not only the correction of technological processes but also the consideration of the structural and phase composition properties [48][49][50][51][52][53][54][55][56][57][58][59][60][61].…”

Section: Literature Survey: State-of-the-artmentioning

confidence: 99%

Hydrogen Cooling of Turbo Aggregates and the Problem of Rotor Shafts Materials Degradation Evaluation

Balitskii,

Syrotyuk,

Havrilyuk

et al. 2023

Energies

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Changes in the properties of 38KhN3MFA steel, from which the rotor shaft is made, were investigated by comparing the hardness of the shaft surface and hydrogen concentration in the chips and analyzing changes in the morphology of the chips under the influence of various factors. The microstructures obtained from the surface of the rotor shaft samples are presented, and histograms reflecting the parameters of the structural components are constructed. An abbreviated diagram of the “life cycle” of the turbine rotor shaft is given. It was found that, during long-term operation (up to 250 thousand hours), the hardness of the rotor shaft surface decreases from 290 HB to 250 HB. It was recorded that, in the microstructure of the shaft during 250 thousand hours of operation, the amount of cementite decreased from 87% to 62%, and the proportion of free ferrite increased from 5% to 20%. The average values of ferrite microhardness decreased from 1.9 GPa to 1.5 GPa. An increase in the content of alloying elements in carbides was recorded: Cr and V—by 1.15–1.6 times; and Mo—by 2.2–2.8 times. With the help of the developed program (using computer vision methods), changes in their microrelief were detected to study photos of chips.

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“…On the example of simple carbides (M 6 C, M 23 C 6 , M 3 C, M 7 C 3 , M 2 C and MS types) with the help of their crystalchemical and thermodynamic analysis the influence and probability of phase transitions, in both liquid and solid steel under the thermal and thermoplastic influence, were evaluated in the work [25]. The study of the specifics of the influence of alloying elements on the composition of carbides of the MS and M23C6 types in the multicomponent Ni -13.5Cr -5Co -3.4Al -4.8Ti -7.3W -0.8Mo -0.015B -0.12C system was carried out in work [26].…”

Section: Introductionmentioning

confidence: 99%

Parameter analysis of non-metallic inclusion formation in thermite alloys

et al. 2021

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The methodology of calculating parameters of the primary and secondary non-metallic inclusion formation in thermite alloys is offered. The regularities of the growth time of non-metallic inclusion in the form of corundum depending on its size, mass and quantity are analysed. It is shown that in the thermite alloy obtained by self-propagating high-temperature synthesis, the average size of corundum inclusions, surrounding the heterogeneous inclusions of chromium carbide, is 15.4 μm. It is shown that during the process of aluminothermic reactions of the SHS process a significant number of small inclusions of corundum is formed. It is shown that the alumina particles are dissolved in the alloy and they are the centers of crystallization and play the role of inoculating modifier.

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Distribution of Elements in Carbides of Multicomponent Superalloys

Cited by 9 publications

References 4 publications

Properties of nickel-based superalloys of equiaxial crystallization

Properties of nickel-based superalloys of equiaxial crystallization

Hydrogen Cooling of Turbo Aggregates and the Problem of Rotor Shafts Materials Degradation Evaluation

Parameter analysis of non-metallic inclusion formation in thermite alloys

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