Experimental studies of prototype models of bimetallic blisks of a high-temperature turbine with cooled blades for advanced gas turbine engines

Abstract

The traditional approach to designing turbine blisks based on the application of disk-blade pawl-coupling does not allow improving the design from the point of view of increasing the service life, reducing the wheel mass and improving the engine efficiency on the whole. This problem can be solved by using dissimilar materials in the integrated bimetallic wheel (blisk). Bimetallic blisk prototype models of a high-temperature turbine have been produced for strength durability research. The bimetallic blisk prototype model consists of one monocrystal cooled blade and a granulated Ni-based disk part. These elements are connected by the hot isostatic pressing (HIP) method. Capsular equipment is designed for producing the prototypes. It ensures the air tightness of the zone of joining of the blisk elements and preservation of the cooling lines in the blades during the HIP process.  Investigations of micro- and macrostructures of prototype joining zones have been carried out. High-cycle fatigue tests of bimetallic blisk prototype models have been carried out. It has been found that fatigue cracks originate in the blade material, whereas the zone of diffusion bonding of the two alloys in test conditions proved to be stronger than the blade material.

About the authors

L. A. Magerramova

Central Institute of Aviation Motors named after P.I. Baranov, Moscow

Author for correspondence.
Email: lamagerramova@mail.ru

Doctor of Science (Engineering)

Senior Researcher, Head of Sector, the Department of Dynamics and Strength of Aviation Engines

Russian Federation

A. N. Stadnikov

Central Institute of Aviation Motors named after P.I. Baranov, Moscow

Email: ustalost@rtc.ciam.ru

Project Design Leader, the Department of Dynamics and Strength of Aviation Engines

Russian Federation

References

  1. Magerramova L.А. Application of bimetallic blisks manufatured by HIP from powder and cast Ni-based superalloys for gas turbine life increase. Vestnik UGATU. 2011. V. 15, no. 4(44). P. 33-38. (In Russ.)
  2. Magerramova L.A., Kratt Е.P., Yasinskiy V.V. Sposob izgotovleniya integralnogo bliska s neokhlazhdayemymi rabochimi lopatkami dlya gazoturbinnogo dvigatelya i integralnyu blisk [Method of integral bladed disc with uncooled blades for gas turbine engine and integral bladed disc]. Patent RF, no 2457177, 2012. (Publ. 2012, bull. no. 32.)
  3. Magerramova L.A., Kratt Е.P., Yasinskiy V.V. Sposob izgotovleniya integralnogo bliska s okhlazhdayemymi lopatkami, integralnyu blisk i okhlazhdaye-maya lopatka dlya gazoturbinnogo dvigatelya [Procedure of manufacturing an integrated blisk with cooled blades, integrated blisk and cooled blades for aircraft engines]. Patent RF, no. 2478796, 2013. (Publ. 20.02.2013, bull. no. 10.)
  4. Bykov Yu.G., Magerramova L.A., Kratt Е.P., Bakulin S.S. Experience in developing a technology of designing a bimetallic turbine blisk of an advanced gas turbine engine. Nauka – proizvodstvu. 2014. No. 9. P. 148-156. (In Russ.)

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