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Characterization of Seven Power-Generating Turbine Rotors Using Microscopy-Based Techniques

Journal Article


Abstract


  • Seven turbine generating rotors, either currently in service or recently retired, have been metallurgically examined using nondestructive techniques, including hardness testing and replication for optical and transmission electron microscopy. The aim has been to understand the microstructural changes occurring in a range of rotors due to service exposure. A decrease in hardness of up to 7% was noted, possibly arising from carbide-induced loss of molybdenum from solid solution. Optical microscopy was unable to detect service-induced microstructural changes. However, fine scale secondary precipitation of MC and M2C were observed using transmission electron microscopy. A range of carbide compositional parameters associated with M3C were found to vary with service exposure time.

Publication Date


  • 1998

Citation


  • Mitchell, D. R. G., & Moss, C. J. (1998). Characterization of Seven Power-Generating Turbine Rotors Using Microscopy-Based Techniques. Journal of Materials Engineering and Performance, 7(5), 621-631. doi:10.1361/105994998770347477

Scopus Eid


  • 2-s2.0-0032188544

Start Page


  • 621

End Page


  • 631

Volume


  • 7

Issue


  • 5

Place Of Publication


Abstract


  • Seven turbine generating rotors, either currently in service or recently retired, have been metallurgically examined using nondestructive techniques, including hardness testing and replication for optical and transmission electron microscopy. The aim has been to understand the microstructural changes occurring in a range of rotors due to service exposure. A decrease in hardness of up to 7% was noted, possibly arising from carbide-induced loss of molybdenum from solid solution. Optical microscopy was unable to detect service-induced microstructural changes. However, fine scale secondary precipitation of MC and M2C were observed using transmission electron microscopy. A range of carbide compositional parameters associated with M3C were found to vary with service exposure time.

Publication Date


  • 1998

Citation


  • Mitchell, D. R. G., & Moss, C. J. (1998). Characterization of Seven Power-Generating Turbine Rotors Using Microscopy-Based Techniques. Journal of Materials Engineering and Performance, 7(5), 621-631. doi:10.1361/105994998770347477

Scopus Eid


  • 2-s2.0-0032188544

Start Page


  • 621

End Page


  • 631

Volume


  • 7

Issue


  • 5

Place Of Publication