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X‐ray topography and crystal orientation study of a nickel‐based CMSX‐4 superalloy single crystal
Author(s) -
Onyszko A.,
Bogdanowicz W.,
Kubiak K.,
Sieniawski J.
Publication year - 2010
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201000389
Subject(s) - superalloy , materials science , minimum deviation , orientation (vector space) , crystal (programming language) , diffraction , nickel , blade (archaeology) , crystallography , single crystal , scanning electron microscope , turbine blade , geometry , composite material , optics , metallurgy , microstructure , chemistry , structural engineering , thermodynamics , physics , mathematics , turbine , computer science , programming language , engineering
A study of the crystal orientation and structural perfection of single crystal blades obtained by Bridgeman method from CMSX‐4 nickel superalloy at various withdrawal rates between 1 and 5 mm/min was carried out using the Laue diffraction method and X‐ray diffraction topography methods as well as electron scanning microscopy. Blades consisted mainly of the regular γ' phase, with [001] γ' ‐type direction close to the blade axis. The angle of deviation of the [001] γ' direction in relation to the blade axis changes between the blade locking piece and end. The dependence this angle on the distance from the locking piece has been named as the crystal orientation distribution (COD). It was found that the nature of COD changes with a change in the withdrawal rate. The change in the withdrawal rate also results in a rotation of [001] γ' ‐type direction in relation to the blade axis. The best blades in terms of orientation and structural perfection were obtained for the withdrawal rate of 3 mm/min. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)