COMPLEX EFFECT OF MODIFICATION ON THE PROPERTIES OF Γ-ALLOY BASED ON TITANIUM ALUMINIDE
DOI:
https://doi.org/10.34185/1991-7848.2025.01.01Keywords:
titanium aluminide, full-factor experiment, modifying elements, regression equations, optimization parameters, response function, mechanical properties.Abstract
Titanium aluminide-based alloys are a promising class of materials, the range of effective use of which is 600-800°C. The advantages of γ-alloys are low density, high structural stability, and heat resistance. The main forming technology for producing parts based on aluminides is casting, which forms a coarse-grained microstructure of the ingot with low values of strength and ductility characteristics. One of the practically feasible ways to improve the properties of γ-alloys is modification. The mechanism of action of modifying elements is adsorption on the surface of grains, which contributes to a change in the surface activity of crystals and the rate of diffusion and leads to a change in the shape and size of crystals. The effect of modifying elements Y, Re, and B on the properties of an alloy based on titanium aluminide of the Ti-28Al-7Nb-2Mo system was investigated using the full-factorial experimental design method. In accordance with the experimental planning matrix using a laboratory vacuum arc furnace with a copper water-cooled crystallizer, ingots of various compositions were melted. A study of the chemical composition, metallographic analysis of the macro- and microstructure, determination of mechanical properties, and analysis of the fracture surface of the samples after testing were carried out. The mechanical properties of the alloy – ultimate strength and ductility – were chosen as optimization parameters. The obtained regression equations make it possible to calculate the chemical composition of the alloy in accordance with the required level of material properties of the aviation product. Also, by substituting the content of modifying elements into the equation, it is possible to predict the results of the mechanical properties of an alloy based on titanium aluminide of the Ti-28Al-7Nb-2Mo system. The optimal composition of the titanium aluminide-based alloy was determined, which provides the value of mechanical properties σв ≥800MPa and plasticity ≥1%.
References
S.V. Akhonin, V.O. Berezos, O.M. Pikuly et al. Obtaining heat-resistant titanium alloys of the Ti–Al–Zr–Si–Mo–Nb–Sn system by electron beam melting. Modern Electrometallurgy, 2022, #2, p.3-9. https://doi.org/10.37434/sem2022.02.01.
Paton B. E., Saenko V. Ya., Pomarin Yu. M., Medovar L. B., Grigorenko G. M., Fedorovsky B. B. Arc slag smelting - modern state and development prospects// Problems of special electrometallurgy. – 2002. - #1. - P.3. https://patonpublishinghouse.com/ukr/journals/sem/2002/01.
Chen, B.; Ma, Y.; Gao, M.; Liu, K. Changes of Oxygen Content in Molten TiAl Alloys as a Function of Superheat during Vacuum Induction Melting. J. Mater. Sci. Technol. 2010, 26, 900–903. https://doi.org/10.1016/S1005-0302(10)60144-2.
Ilin A.A., Kolachev B.A., Polkin I.S. Titanovye splavy. Sostav, struktura, svojstva. Spravochnik. – M.: VILS-MATI, 2009. – 520s. https://i.twirpx.link/file/4038331/. (In Russian).
Malcev M.V. Modificirovaniya struktury metallov i splavov. – M.: Metallurgizdat, 1964. – 214s. https://i.twirpx.link/file/2189122/. (In Russian).
Vinarskij M.S. Planirovanie eksperimenta v tehnologicheskih issledovaniyah /M.S. Vinarskij, M.V. Lure – K.: Tehnika, 1975. – 168 s. (In Russian)
Reith M., Franke M., Schloffer M., Körner C. Processing 4th generation titanium aluminides via electron beam based additive manufacturing–characterization of microstructure and mechanical properties. Materialia 2020, 14. https://doi.org/10.1016/j.mtla.2020.100902.
Wimler, D.; Lindemann, J.; Reith, M.; Kirchner, A.; Allen, M.; Vargas, W.G.; Franke, M.; Klöden, B.; Weißgärber, T.; Güther, V. et al. Designing advanced intermetallic titanium aluminide alloys for additive manufacturing. Intermetallics 2021, 131. https://doi.org/10.1016/j.intermet.2021.107109.
Klein, T.; Usategui, L.; Rashkova, B.; Nó, M.L.; San Juan, J.; Clemens, H.; Mayer, S. Mechanical behavior and related microstructural aspects of a nano-lamellar TiAl alloy at elevated temperatures. Acta Mater. 2017, 128, 440–450. https://doi.org/10.1016/j.actamat.2017.02.050.
Horev A.I. Kompleksnoe legirovanie i mikrolegirovanie titanovyh splavov / A.I. Horev // Svarochnoe proizvodstvo. – 2009. – № 6. – S.21-30. (In Russian).
R.A.Gajsin, V.M.Imaev, R.M.Imaev, E.R.Gajsina. Vliyanie modificirovaniya borom na rekristallizacionnoe povedenie tehnicheski chistogo titana pri goryachej deformacii/Pisma o materialah 5 (2), 2015, 124-128.https://doi.org/10.22226/2410-3535-2015-2-124-128 (In Russian).
N.M.Ulyakova. Vliyanie redkozemelnyh metallov na mehanicheskie svojstva i strukturu zharoprochnogo titanovogo a-splava/ Metallovedenie i termicheskaya obrabotka metallov, №3, 1994. (In Russian)
Downloads
Published
Issue
Section
License
Copyright (c) 2025 Modern Problems of Metallurgy
This work is licensed under a Creative Commons Attribution 4.0 International License.
