Formation of the Al-rich phase on grain boundary and the creep damage mechanism in directionally solidified Ni-base superalloy

Journal Article · Mon Sep 01 00:00:00 EDT 1997 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-997-0125-3· OSTI ID:544068

Komazaki, S; Shoji, T ^[1]

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1. Tohoku Univ., Sendai (Japan). Research Inst. for Fracture Technology

A directionally solidified Ni-base superalloy is mainly used for blade materials in an advanced gas turbine. It is well known that base-load machines suffer creep damage to first-stage blades and buckets, and microstructural degradation phenomena such as coarsening of {gamma}{prime} phase and grain-boundary carbides can render the blade materials increasingly vulnerable to damage by creep. In this study, in order to verify the creep damage mechanism in a directionally solidified Ni-base superalloy, CM247LC, microstructural changes and possible resultant microcrack initiation behavior during creep are investigated, especially as they relate to grain boundary.

• Sponsoring Organization: USDOE
• OSTI ID: 544068
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 28, Issue 9; Other Information: PBD: Sep 1997
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
20 FOSSIL-FUELED POWER PLANTS
MICROSTRUCTURE
CREEP
NICKEL BASE ALLOYS
GAS TURBINES
COBALT ALLOYS
TUNGSTEN ALLOYS
CHROMIUM ALLOYS
ALUMINIUM ALLOYS
TANTALUM ALLOYS
MOLYBDENUM ADDITIONS
TITANIUM ADDITIONS
GRAIN BOUNDARIES
CARBIDES
CRACKS
MORPHOLOGY
EXPERIMENTAL DATA