Premature failure of gas turbine blade

Zainuddin Sajuri, A. R. Said, M. L. Ibrahim, J. Syarif

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A set of first stage stationary blade of gas turbine was prematurely replaced due to severe cracking after 5,000 hours in operation. Failure investigation was conducted on damaged blades by non-destructive penetrant inspection, microstructure examination, chemical analysis, hardness mapping and fracture surface observation. The blade material, verified as IN738LC nickel superalloy, exhibited presence of elongated grain boundary carbides, TCP phases formation, and grain boundary creep void on the airfoil. Morphology of γ′ precipitation, however, was normal throughout the blade with size of approximately 1μm and no significant coarsening. Presence of welding structure and possible brazing layer on the airfoil was detected suggesting that the blade was previously refurbished. Primary crack occurred on previous welding repair and propagated in transgranular mode. It was concluded that the blade failure was caused by improper welding repair despite evidence of base material degradation.

Original languageEnglish
Title of host publicationKey Engineering Materials
Pages325-330
Number of pages6
Volume462-463
DOIs
Publication statusPublished - 2011
Event8th International Conference on Fracture and Strength of Solids 2010, FEOFS2010 - Kuala Lumpur
Duration: 7 Jun 20109 Jun 2010

Publication series

NameKey Engineering Materials
Volume462-463
ISSN (Print)10139826

Other

Other8th International Conference on Fracture and Strength of Solids 2010, FEOFS2010
CityKuala Lumpur
Period7/6/109/6/10

Fingerprint

Turbomachine blades
Gas turbines
Welding
Airfoils
Grain boundaries
Repair
Brazing
Coarsening
Nickel
Superalloys
Carbides
Creep
Inspection
Hardness
Cracks
Degradation
Microstructure
Chemical analysis

Keywords

  • Failure analysis, welding
  • IN738LC
  • Turbine blade

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Sajuri, Z., Said, A. R., Ibrahim, M. L., & Syarif, J. (2011). Premature failure of gas turbine blade. In Key Engineering Materials (Vol. 462-463, pp. 325-330). (Key Engineering Materials; Vol. 462-463). https://doi.org/10.4028/www.scientific.net/KEM.462-463.325

Premature failure of gas turbine blade. / Sajuri, Zainuddin; Said, A. R.; Ibrahim, M. L.; Syarif, J.

Key Engineering Materials. Vol. 462-463 2011. p. 325-330 (Key Engineering Materials; Vol. 462-463).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Sajuri, Z, Said, AR, Ibrahim, ML & Syarif, J 2011, Premature failure of gas turbine blade. in Key Engineering Materials. vol. 462-463, Key Engineering Materials, vol. 462-463, pp. 325-330, 8th International Conference on Fracture and Strength of Solids 2010, FEOFS2010, Kuala Lumpur, 7/6/10. https://doi.org/10.4028/www.scientific.net/KEM.462-463.325
Sajuri Z, Said AR, Ibrahim ML, Syarif J. Premature failure of gas turbine blade. In Key Engineering Materials. Vol. 462-463. 2011. p. 325-330. (Key Engineering Materials). https://doi.org/10.4028/www.scientific.net/KEM.462-463.325
Sajuri, Zainuddin ; Said, A. R. ; Ibrahim, M. L. ; Syarif, J. / Premature failure of gas turbine blade. Key Engineering Materials. Vol. 462-463 2011. pp. 325-330 (Key Engineering Materials).
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