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Title: Effect of minor carbon additions on the high-temperature creep behavior of a single-crystal nickel-based superalloy

Different amounts of carbon were added to a single-crystal nickel-based superalloy. The microstructural evolution of these alloys before and after high-temperature creep tests was investigated by employing scanning electron microscopy and transmission electron microscopy. Upon increasing the carbon contents, the volume fraction and diameter of the carbides increased gradually: however, the creep lives of the alloys increased slightly at first and subsequently decreased. The formation of second-phase particles, such as the nano-sized M{sub 23}C{sub 6}, blocky and needle-shaped μ phase, was observed in the creep samples, which was closely related to the high-temperature creep behaviors. - Highlights: • Creep behaviors of alloys with different amounts of carbon were investigated. • The creep rupture lives increased and later decreased with more carbon. • Second-phase particles were responsible for the different creep behaviors.
Authors:
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Publication Date:
OSTI Identifier:
22476098
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 104; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBON; CARBON ADDITIONS; DISLOCATIONS; HEAT RESISTING ALLOYS; MICROSTRUCTURE; MONOCRYSTALS; NANOSTRUCTURES; NICKEL COMPOUNDS; PRECIPITATION; RUPTURES; SCANNING ELECTRON MICROSCOPY; TRANSMISSION ELECTRON MICROSCOPY