Rafting prediction criterion for superalloys under a multiaxial stress

Journal Article · Sun Sep 15 04:00:00 EDT 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/1359-6462(96)00207-2· OSTI ID:382544

Arrell, D J; Valles, J L ^[1]

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1. Joint Research Centre, Petten (Netherlands). Inst. for Advanced Materials

The effect of external stresses on the coalescence behavior of the precipitate phase in nickel-base superalloys has been studied for more than two decades. A novel criterion for the prediction of rafting under a uniaxial stress, based on the relief of interfacial misfit strains by dislocation generation at the {gamma}-{gamma}{prime} interfaces, has recently been developed by the authors. The prediction maps constructed from it successfully reproduce the experimental behavior exhibited by a number of real alloys. The simplicity of the criterion has further allowed for a direct incorporation into a Monte-Carlo formalism to simulate the evolution of the microstructure under creep conditions. In this paper, the authors present an extension of that criterion which provides prediction maps for multiaxial stress situations, and thus allows for the interpretation of the three-dimensional coarsening behavior.

• OSTI ID: 382544
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 6 Vol. 35; ISSN XZ503X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
COALESCENCE
DENDRITES
DISLOCATIONS
INTERFACES
MICROSTRUCTURE
NICKEL BASE ALLOYS
ORIENTATION
PRECIPITATION
SERVICE LIFE
STRAINS
STRESSES
TEMPERATURE DEPENDENCE