Abstract
An analysis of the operation of blades of gas turbine engines (GTE) manufactured from cast nickel alloys has made it possible to determine some of the causes of failure in operation, such as changes in the geometric dimensions or degradation of the microstructure. As a rule, the first cause is considered to be decisive. In order to increase the service life of blades partial regenerative repair of them is envisaged. In this case the dimensions of the blades are usually restored without allowing for possible changes in their structure, which can have a negative effect on operation after the restoration. For this reason, the second cause can become decisive in the reduction of their service life. This work is devoted to investigating the regularities of the degradation of the structure and properties of the material of cast GTE blades made of a high-temperature nickel alloy of the ZhS6U-VI type under operating conditions. A structural criterion determining the operating capacity of the olades and the ultimate level of structural degradation are established. A regenerative heat treatment to be conducted after partial exhaustion of the opet acing resource accompanied by structural changes that occur within the critical range of the structural criterion is suggested.
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References
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 16 – 20, May, 1996.
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Godovanets, M.A., Prusakov, B.A. & Lysenko, I.I. Regenerative heat treatment of blades of high-temperature nickel alloys. Met Sci Heat Treat 38, 202–206 (1996). https://doi.org/10.1007/BF01397020
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DOI: https://doi.org/10.1007/BF01397020