Experimental determination of thermal-fatigue life of turbine blades with various coatings made of an advanced heat resistant nickel alloy

Abstract


An original CIAM know-how for the experimental determination of thermal-fatigue life of parts of the gas-turbine engine hot section, including parts with heat-resistant and ceramic thermal barrier coatings, in the conditions of superficial uneven heating by high-frequency currents with continuous cooling of the parts at the preset air consumption is outlined in the paper.  The possibility of using high-frequency heating of the parts with coatings (including thermal protection coatings) for modeling superficial heating of full-scale parts of gas-turbine engines is shown on the basis of the tests of model samples with coatings controlling the temperature of the surface by means of a thermal imager. The method used makes it possible to simulate the thermal state of the part in the operating conditions. Temperature differences observed both over the surface and the thickness of a part create thermal stresses in the material, similar to those arising during the operation of the engine. If necessary, mechanical loads synchronized with changes in temperature, to simulate for example, the centrifugal force may be applied to the part. The article presents the results of experimental studies of thermal-fatigue life of rotor blades of the 1st stage of the turbine made of an advanced monocrystal alloy VZhM-5 without coating and with various protective coatings, conducted according in the regime Tmin↔Tmax = 350↔1050˚C.


About the authors

N. G. Bychkov

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

Author for correspondence.
Email: bychkov@rtc.ciam.ru

Russian Federation

Candidate of Science (Engineering)

Chief of sector

Yu. A. Nozhnitsky

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

Email: nozhnitsky@ciam.ru

Russian Federation

Doctor of Science (Engineering)

Deputy Head of the Strength Department

A. S. Khamidullin

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

Email: khamidullin@rtc.ciam.ru

Russian Federation

Engineer

A. V. Pershin

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

Email: bychkov@rtc.ciam.ru

Russian Federation

Research engineer

V. V. Avrutsky

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

Email: khamidullin@rtc.ciam.ru

Russian Federation

Engineer

References

  1. Bychkov N.G., Lukash V.P., Nozhnitsky Y.A., Perchin A.V., Rekin A.D. Investigation of thermomechanical fatigue for optimization of design and production process solutions for gas-turbine engine parts. International Journal of Fatigue. 2008. V. 30, Iss. 2. P. 305-312. doi.org/10.1016/j.ijfatigue.2007.01.046
  2. Bychkov N.G., Lepeshkin A.R., Pershin A.V. Ustanovka dlya ispytaniy lopatok turbomashin na termomekhanicheskuyu ustalost' [Device for testing blades of turbine apparatus]. Patent RF, no. 2250451, 2005. (Publ. 20.04.2005)
  3. OST 10097-80. Test methods on thermal fatigue. Мoscow: 1980. 56 р. (In Russ.)
  4. GOST 25505-85. Calculations and tests for durability. Test methods on low cycle fatigue at thermomechanical loading. Moscow: 1985. (In Russ.)
  5. Bychkov N.G., Lepeshkin A.R., Pershin A.V. Induktor dlya nagreva detaley slozhnoy formy [Induction coil for heating articles of complex shape]. Patent RF, no. 2122297, 1998. (Publ. 20.11.1998)

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