Napolitano, R.
and Schaefer, R.
(2008),
Predicting the Location of Low-Angle Boundaries in Single-Crystal Castings, Journal of Materials Science
(Accessed February 2, 2026)
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Predicting the Location of Low-Angle Boundaries in Single-Crystal Castings
Published
Author(s)
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Abstract
A set of nickel-based superalloy single-crystal investment castings was produced and evaluated for crystal perfection. Defect structures near the seed emergence point and other geometric features were examined using x-ray topography. Topographic images were compared with metallographically observed dendritic structures to establish a convergence-fault criterion for the location of low-angle boundaries. A trip-growth model for simulation of the growth of the dentritic network was developed. This model predicts the local primary growth direction and identifies regions of convergent growth. A connectivity parameter is used to map the locations which are most vulnerable to convergence-fault formation. Predictions are compared with experimental observation.Citation
Journal of Materials Science
Pub Type
Journals
Keywords
defect prediction, dendritic growth, low-angle boundaries, single-crystal casting
Citation
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Created October 16, 2008