Thickening behavior of {gamma}{prime} precipitates in nickel base superalloys during rafting

Journal Article · Fri Jun 12 04:00:00 EDT 1998 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(98)00154-7· OSTI ID:634741

Chen, W; Immarigeon, J P ^[1]

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1. National Research Council of Canada, Ottawa, Ontario (Canada)

Directional coarsening (rafting) OF {gamma}{prime} precipitates in nickel base superalloys occurs when these materials are subjected to stresses at high temperature. The mechanisms responsible for this coarsening have been extensively studied in recent years. None of the models distinguish the effects of Ostwald ripening from those caused by directional coalescence. In this paper, both mechanisms are considered to contribute to the rafting process in separate ways, and a phenomenological description of the thickening behavior of {gamma}{prime} precipitates during rafting is formulated to explain experimental data reported in the literature. The practical implications are briefly discussed.

• OSTI ID: 634741
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 2 Vol. 39; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
GRAIN GROWTH
MICROSTRUCTURE
MONOCRYSTALS
MORPHOLOGY
NICKEL BASE ALLOYS
PARTICLE SIZE
PRECIPITATION
STRESSES