La, Pr, Nd microalloying influence on deformable heat resisting nickel alloy of the VZh175 type structure forming

E.B. Chabina, E.V. Filonova, B.S. Lomberg, M.M. Bakradze


By high-allowing metal physical and heat physical techniques complex means lanthanum, prazeodim and neodim separate influence on deformable high-heat resisting Ni-Co-Cr-Al-Ti-W-Mo-Nb alloying system nickel base alloy structure forming features are investigated. Three model material compositions structural and phase conditions were studied after heat treatment. It is shown that lanthanum, prazeodim and neodim individual influence on quantity of phases, grain and interphase boundaries structure change and material heat physical characteristics variously. These alloys class structure represents - solid solution grains with primary -phase particles, evenly distributed on grain boundaries. The alloy contains niobium and titanium based carbides MC, being formed at material crystallization stage during melting. Solid solution in grains is strengthened by secondary -phase particles. Grain boundaries are strengthened by -phase, chrome and molybdenum based carbides and bo-rides particles. At introduction in the material rare earth elements (RZE) complicated structure different sizes and morphology nickel and RZE based intermetallid phases, which are evenly distributed in material volume, are formed. They also allocated on grain and / interphase boundaries, in addition strengthening them. Material structure change distinctions are revealed: maximum quantity grain and / interphase boundaries secondary carbides, borides and intermetallid phases with RZE after heat treatment are containing at composition with the prazeodim; composition with the neodim differs by the maximum nanodimensional -phase quantity and the minimum secondary intermetallid phase with RZE quantity. Containing lanthanum, prazeodim and neodim compositions differ with temperature and total warmth of endothermic effect of carbide, boride and intermetallic phases dissolution.

References (17)

Kablov E.N. Strategical areas of developing materials andtheir processing technologies for the period of up to 2030,Aviation Materials and Technologies. No. S, 7 (2012) (inRussian).
Cast Blades of Gas Turbine Engines: Alloys, Technology,Coatings. Under the general editorship of Kablov E.N.,2nd edition. Moscow, Nauka, 2006. 632 p. (in Russian).
Kablov E.N., Ospennikova O.G., Lomberg B.S.Comprehensive innovative technology of isothermalforging of superalloy discs in air in the superplasticityregime, Aviation Materials and Technologies. No. S, 129 (2012) (in Russian).
Superalloys. Vol. II / ed. by Ch.T. Sims, N.S. Stoloff, W.C.Hagel. Transl. from English. Moscow: Metallurgiya. 1995. Book 1. 384 p. (in Russian).
Bokstein S.Z., Kishkin S.T., Shalin R.E. Structural stabilityof structural materials. In the book: Aviation Materials atthe Turn between XX-XXI Centuries. Moscow: VIAM. 1994. P. 547. (in Russian).
McLean M., Strang A. Effects of trace elements onmechanical properties of superalloys. Metals Technology,11 (10), 454 (1984).
Lomberg B.S., Ovsepyan S.V., Bakradze M.M., MazalovI.S. High-temperature Ni alloys for gas-turbine engineparts, Aviation Materials and Technologies. No. S, 52 (2012) (in Russian).
Lomberg B.S., Bakradze M.M., Chabina E.B., FilonovaE.V. Relationship between the structure and properties ofhigh-temperature Ni alloys for gas-turbine engine discs,Aviation Materials and Technologies. No. 2, 25 (2011) (in Russian).
Lomberg B.S., Bakradze M.M., Chabina E.B., FilonovaE.V. Effect of microalloying elements on structural andphase stability and properties of heat-resistant deformablealloy (with long operation time), Metallurg. 9, 93 (2013)(in Russian).
Lomberg B.S., Ovsepyan S.V., Bakradze M.M. Peculiaritiesof the alloying and heat treatment of high-temperatureNi alloys for discs of gas-turbine engines of the nextgeneration, Aviation Materials and Technologies. 2, 3, (2010) (in Russian).
Bakradze M.M., Ovsepyan S.V., Shugaev S.A., LetnikovM.N. The influence of quenching on structure andproperties of nickel-based superalloy EK151-ID forgings,Works of VIAM. 9, Paper 01 (2013) ( (in Russian).
Lomberg B. S., Ovsepyan S. V., Bakradze M. M. Newhigh-temperature Ni alloy for discs of gas-turbine enginesand gas-turbine plants, Materialovedenie. 7, 24 (2010) (in Russian).
Artyushov V.N., Kudrin A.A., Kirpichnikov M.S.,Ponomareva L.L. Effect of microalloying on processductility of high-temperature alloy KhN62MBKTYu(EP742-ID), Metallurgist. 55 (7-8), 591 (2011).
Kozlov E.V., Nikonenko E.L., Popova N.A., Koneva N.A.Effect of alloying by lanthanum on phase compositionof super-alloys based on Ni–Al–Cr, Tambov UniversityReports, Series: Natural and Technical Sciences. 18(4), 1527 (2013) (in Russian).
Chabina E.B., Filonova E.V., Lomberg B.S., BakradzeM.M. All Materials. Encyclopedic directory. 6, 22 (2012)(in Russian).
Chabina E.B., Filonova E.V., Lomberg B. S., Zaitsev D.V.Structure formation in a nickel superalloy complexlyalloyed with lanthanides, Russian Metallurgy 11, 904(2014).
Chabina E.B., Alekseev A.A., Filonova E.V., Lukina E.A.The use of methods of analytical microscopy and X-raydiffraction analysis for the study of the structural-phasestate of materials, Works of VIAM. 5, Paper 06 (2013)( (in Russian).