Optimization of the phase composition of a fluid nickel alloy for gas turbine engines and installations
DOI:
https://doi.org/10.54858/dndia.2024-20-31Keywords:
nickel-based super alloy, single crystal, alloying elements, phase composition, structureAbstract
The article presents a methodical approach to establishing the relationships between the chemical and phase composition of a single-crystal heat-resistant nickel-based alloy used in gas turbine construction. As the main feature of the stability of the parts, the relationship between the number of alloying elements and the heat resistance (long-term strength) of the alloy was established. At the same time, alloying limits were established for the indicated alloying elements and changes in the composition of the strengthening phase were shown. Mathematical models describing the above-mentioned processes are also proposed.
Establishing dependencies will allow with high accuracy: to predict the phase composition and properties of alloys of a given class, to carry out the modernization of existing compositions, and will make it possible to develop new compositions of alloys with the lowest costs.
During the study, it was established that with an increase in the concentration of tantalum, the amount of the g¢- phase and the temperature of its complete dissolution increase. An increase in the content of rhenium to 3% leads to the formation of the TCP-phase (HCP_A3), and at 6% rhenium (P-phase), which significantly reduces the strength of the alloy. An equilibrium mismatch is observed between 5 and 6% of rhenium and tantalum in the alloy. An increase in the amount of rhenium and tantalum in the alloy leads to an increase in heat resistance
Based on the results of the research, new regression models were established that allow adequately predicting the chemical composition of the phases based on the chemical composition of the alloy. It is shown that the obtained dependences change depending on the content of the element and are closely correlated with the thermodynamic processes occurring in the system, which are accompanied by a change in the composition of the phases. The reliability of the obtained models is determined by the coefficient of determination, which was greater than 0.9 for all dependencies.
As an example, the industrial composition of the alloy was chosen and a comparison of calculated and practical data was carried out. Based on the results, a recommendation was put forward to implement the obtained dependencies in industry.
References
Kvasnytska, Y.H. High-Temperature Salt Corrosion of a Heat-Resistant Nickel Alloy/ Y.H. Kvasnytska, L.М. Ivaskevych, О.І. Balytskyi // Material Sciences/ - 2020 - №.56. – Р. 432–440. DOI: https://doi.org/10.1007/s11003-020-00447-5
Min, P.G. Development of Corrosion and Heat-Resistant Nickel Alloys and their Production Technology with the Aim of Import Substitution / P.G. Min, V.V. Sidorov, V.E. Vadeev // Power Technol Eng. – 2020. - №54. – Р. 225–231. DOI: https://doi.org/10.1007/s10749-020-01195-x
Yonghua, R. Characterization of M23C6 carbide precipitated at grain boundaries in a superalloy / R. Yonghua, Hu. Geng, G. Yongxiang // Metallography. – 1989. - №22(1). – Р. 47-55. DOI: 10.1016/0026-0800(89)90021-9.
Jadav, J. Effects of Strain Rate and Temperature on Tensile Properties, Deformation and Dynamic Strain Ageing Behavior of Ni-Base Superalloy / J. Jadav, K.V. Rajulapati, Rao. Bhanu Sankara // INAE Letter. – 2019. - №4. – Р. 241–250. DOI: https://doi.org/10.1007/s41403-019-00083-9
Chen, K. Microstructure and homogenization process of as-cast GH4169D alloy for novel turbine disk / K. Chen, Sy. Rui, F. Wang //Int J Miner Metall Mater. – 2019. - №26. – Р. 889–900. DOI: https://doi.org/10.1007/s12613-019-1802-0
Birosca, S. Crystallographic Orientation Relationship with Geometrically Necessary Dislocation Accumulation During High-Temperature Deformation in RR1000 Nickel-Based Superalloy/ S. Birosca // Metall Mater Trans A. – 2019. - №50. – Р.534–539. DOI: https://doi.org/10.1007/s11661-018-5036-y
Seidel, A. Additive Manufacturing of Powdery Ni-Based Superalloys Mar-M-247 and CM 247 LC in Hybrid Laser Metal Deposition / A. Seidel, T. Finaske, A. Straubel //Metall Mater Trans A. – 2018. - №49. – Р.3812–3830. DOI: https://doi.org/10.1007/s11661-018-4777-y
Ritt, P. Application of Plasma Spraying as a Precursor in the Synthesis of Oxidation-Resistant Coatings/ P. Ritt, O. Lu-Steffes, R. Sakidja // J Therm Spray Tech. – 2013. - №22. – Р. 992–1001.DOI: https://doi.org/10.1007/s11666-013-9947-2
Glotka O.A. Modelling the composition of carbides in nickel-based superalloys of directional crystallization / O.A. Glotka O.A. // Journal of Achievements in Materials and Manufacturing Engineering. – 2020. - № 102/1. – Р. 5-15. DOI: https://doi.org/10.5604/01.3001.0014.6324
Glotka, A.A. Distribution of Alloying Elements in the Structure of Heat-Resistant Nickel Alloys in Secondary Carbides / A.A. Glotka, S.V. Gaiduk // J Appl Spectrosc. – 2020. - №87. – Р.812–819. DOI: https://doi.org/10.1007/s10812-020-01075-2
Avila-Davila, E.O. Evaluation of Microstructural Deterioration for a Directionally Solidified Ni-Based Superalloy by X-ray Computed Tomography / E.O. Avila-Davila, L.M. Palacios-Pineda, F.O. Canto-Escajadillo // J. of Materi Eng and Perform. - 2021. - №56. – Р. 235-267. DOI: https://doi.org/10.1007/s11665-020-05377-6
Liang, T. Role of script MC carbides on the tensile behavior of laser-welded fusion zone in DZ125L/IN718 joints at 650 °C / T. Liang, L. Wang, Y. Liu // J Mater Sci. – 2020. - №55. – Р.13389–13397. DOI: https://doi.org/10.1007/s10853-020-04931-w
