Effect of Rejuvenation Heat Treatment on the Degraded Turbine Blades

This paper presents a novel approach to estimate the extended lifetime of first-stage turbine blades made of directionally solidified GTD-111 nickel-based superalloys. These turbine blades were removed from land-based industrial gas turbines for power generation. In addition, this new way to evaluat...

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Veröffentlicht in:	Journal of failure analysis and prevention 2021-02, Vol.21 (1), p.74-82
Hauptverfasser:	Sabri, Khier, Si-Chaib, Mohamed Ouali, Gaceb, Mohamed
Format:	Artikel
Sprache:	eng
Schlagworte:	Characterization and Evaluation of Materials Chemistry and Materials Science Classical Mechanics Corrosion and Coatings Degradation Directional solidification Electric power generation Gas turbines Heat treating Heat treatment Materials Science Nickel Nickel base alloys Quality Control Reliability Safety and Risk Service life assessment Solid Mechanics Superalloys Technical Article > -Peer-Reviewed Tribology Turbine blades Turbines
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Beschreibung
Zusammenfassung:	This paper presents a novel approach to estimate the extended lifetime of first-stage turbine blades made of directionally solidified GTD-111 nickel-based superalloys. These turbine blades were removed from land-based industrial gas turbines for power generation. In addition, this new way to evaluate the lifetime extension of degraded turbine blades after rejuvenation heat treatment is based on knowledge of newly introduced degradation index ( D i ) evolution. The rejuvenation heat treatment (RHT) process offers an extension of 36% in blades lifetime. Effect of the RHT on the aged γ-γ’ microstructures is presented and discussed.
ISSN:	1547-7029 1728-5674 1864-1245
DOI:	10.1007/s11668-020-01035-0