Structural and acoustic anisotropy of turbocompressor blade material


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Abstract

The investigation is concerned with working compressor blades of the sixth and eighth stages of the turbo-compressor rotor of the ДЖ59Л engine made of stainless ЭИ961 (13Х12Н2В2МФ) heat-resistant steel in a post-operation state and the same blades after tempering. The objects of research are the parameter of intrinsic acoustic anisotropy and the structural anisotropy factor of the carbide phase of material of turbo-compressor blades in post-operation state and subsequent tempering. The aim of the study is to show that the ultrasonic echo technique holds promise as a method of nondestructive control of the material structure directly on the product both at the stage of output control in the production and repair of blades, and in the post-operation state. The analysis of the blade material structure is carried out using the methods of optical metallography with the use of the “GoodGrains” software and ultrasonic echo technique of nondestructive control. Using the method of optical metallography it was established that a carbide phase of acicular shape is present in the material of blade airfoil with a high degree of anisotropy, which indicates the degradation of microstructure in the post-operation state. Positive influence of tempering on the uniformity of carbide phase distribution in the material of rotor blades is noted. Correlation between the parameter of acoustic anisotropy and the metallographic anisotropy factor of inclusions of a carbide phase in the blade material is revealed. The echo technique of nondestructive control of structure shows great promise for application at any stage of output control directly on a product.

About the authors

Y. P. Tarasenko

Institute of Mechanical Engineering Problems of the Russian Academy of Sciences

Author for correspondence.
Email: npktribonika@yandex.ru

Candidate of Science (Physics and Mathematics)

Head of laboratory

Russian Federation

L. A. Krivina

Institute of Mechanical Engineering Problems of the Russian Academy of Sciences

Email: npktribonika@yandex.ru

Research assistant

Russian Federation

E. A. Motova

Institute of Mechanical Engineering Problems of the Russian Academy of Sciences

Email: npktribonika@yandex.ru

Candidate of Science (Engineering)

Senior research associate

Russian Federation

N. Ye. Nikitina

Institute of Mechanical Engineering Problems of the Russian Academy of Sciences

Email: npktribonika@yandex.ru

Doctor of Science (Engineering)

Russian Federation

References

  1. Tsarova I.N., Berdnik O.B., Krivina L.A., Fel Ya.A. Otsenka of technical condition of working shovels of the compressor from an alloy of EI961 of the power GTE-45-3 installation // Sbornik nauchnykh trudov «Prikladnaya mekhanika i tekhnologii mashinostroeniya». No. 22 (1). Nizhniy Novgorod: Intelservis Publ., 2013. P. 37-42. (In Russ.)
  2. Monichev S.A., Nikitina N.Ye. Ultrazvukovoy echo method of research of elastic properties of solid bodies. Pre-print No. 24-04-03 / Nf of IMASH Russian Academy of Sciences. N. Novgorod, 2004. 22 p.
  3. Motova E.A., Nikitina N.E., Tarasenko Y.P. Concerning the possibility of examining compressor blades according to attenuation and speed of ultrasound // Journal of Machinery Manufacture and Reliability. 2013. V. 42, no. 4. P. 335-340.

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