Research of Solid Compound Formation during Thermal Deformation Effect on Intermetallic Ni₃Al-Alloy with a Heat-Resistant Alloy EP975 and Influence on the Physical, Mechanical and Performance Properties

Abstract:

The work is aimed at processing highly efficient one-piece units of gas turbine aircraft engines discs with blades (blisks) to exclude heavy locking joints and to reduce the weight of the units while improving their reliability. Intermetallic γ ́+γ alloys based on γ ́-Ni₃Al phase of the VKNA type selected as blade material and Ni-based high alloy EP975 selected for discs have similar initial melting temperatures (~1340^оС and~1300^оC, respectively). Solid state joints (SSJ) EP975 //VKNA-mono are obtained at the homologous temperatures of 0.86-0.91 Tm (K).It is shown that the most efficient method for producing solid joints between the Ni₃Al based intermetallic alloys and the EP975-type high-temperature nickel alloys is a solid state pressure welding in the conditions of high-temperature superplasticity; this technique has been developed in the IMSP RAS (grant RFBR No 130812200).

• Periodical: Materials Science Forum (Volumes 838-839)
• Pages: 523-527
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.838-839.523
• Online since: January 2016
• Authors: Vener Valitov*, Kira Povarova, Olga Bazyleva, Andrey Drozdov, Sergey Ovsepyan, Elvina Galieva
• Keywords: Diffusion, Nickel Alloy, Single Crystal, Solid State Joints, Superplasticity, Welding

References

[1] A.V. Logunov, Yu.N. Shmotin, Modern high temperature nickel alloys for disks of gas turbines, Public corporation «Science and Technology» Moscow, 2013. (in Russian).

[2] K.B. Povarova, A.A. Drozdov, V.P. Buntushkin, N.K. Kazanskaya, O.A. Bazyleva, Extra light high temperature nanostructured alloys based on Ni3Al for aviation engine building and power mechanical engineering , Voprosy Materialovedeniya. 2 (2008).

[3] Ju.R. Kolobov., E.N. Kablov et al. Structure and properties of intermetallic materials with nanophase strengthening, Publishinghouse MISiS, Moscow, 2008 (in Russian).

[4] K.B. Povarova, N.K. Kazanskaya, A.A. Drozdov, I.O. Bannykh, V.P. Buntushkin, O.A. Bazyleva, V.G. Kostogryz, V.G. Bakharev, V.I. Mironov, Thermal structural stability of an Ni3Al-based alloy and its application for blades in small gas-turbine engines, Russian metallurgy, 3 (2003).

[5] V.A. Valitov, Thermomechanical treatment - an effective method for producing ultrafine-grained and nanocrystalline structure in nickel alloys, Letters on Materials, 3 (2013) pp.50-55 (in Russian).

[6] K.B. Povarova, A.A. Drozdov, O.A. Bazyleva, Yu.A. Bondarenko, M.A. Bulakhtina, E.G. Arginbaeva, A.V. Antonova, A.E. Morozov, D.G. Nefedov, Effect of the method of producing Ni3Al-based alloy single crystals on the macro- and microhomogeneity of component distribution, structure and properties, Russian metallurgy, 5 (2014).

DOI: 10.1134/s0036029514050085