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 04:00:00 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, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 9 Vol. 28; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: English

Related Subjects

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