Exploring the properties changes of the titanium alloy blades surface after chemical cleaning from carbonaceous impurities

Аuthors

Nochovnaya N. A., Nikitin Y. Y.^*, Savushkin A. N.

All-Russian Scientific Research Institute of Aviation Materials. State Research Center of the Russian Federation, 17, Radio str., Moscow, 105005, Russia

*e-mail: nikitinyj@viam.ru

Abstract

It is important to understand how a cleaning technology can change the physico-chemical properties of the material being cleaned after removing carbonaceous impurities from the compressor parts surface of a gas turbine engine. In continuation of the previous work, the creep of VT20 titanium alloy samples was examined, and one of the selected chemical technologies that remove carbonaceous impurities was tested on compressor blades with subsequent determination of some surface properties.

To evaluate the creep of VT20 titanium alloy characteristics, the standard flat samples, some of which were coated with carbonaceous impurities that simulate exploitation, were fabricated. Two titanium compressor blades of a gas turbine engine were used in the research work: blade 1 (small) after operation with a small amount of contaminants on the surface, and blade 2 (large), on which carbonaceous impurities, imitating operation, were coated.

The creep tests results proved that the impurities removal by cleaning solution No. 1, alkaline and acid solutions (“loosening + etching”), and HDL 202 did not reduce the time of the samples destruction and degraded their plasticity, compared to the original samples.

Allowing for the results of the previous work, 9. cleaning solution No. 1 was selected for testing the of carbonaceous impurities removal from the surface of the blades. The results of blades processing revealed ¹⁰ that the surface was completely cleaned. In in X-ray microanalysis spectrograms the elements such as sulfur, oxygen and carbon, indicative of the presence of carbonaceous impurities, are missing. The values of surface roughness and micro-hardness did not sustain significant changes. Processing in the indicated solution leads to activity (potential) increase of the of blade No. 1 surface. The lower values of the blade No. 2 surface potential were observed (about 10%) compared to the initial state.

Keywords:

blades, solutions, operational pollution, strength, plasticity, roughness, contact potential difference, recovery, titanium alloys

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