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|Title: ||Microstructural evolution of single crystal and directionally solidified rejuvenated nickel superalloys|
|Authors: ||Rowe, Andrew W.|
Thomson, Rachel C.
|Issue Date: ||2012|
|Publisher: ||© John Wiley and sons|
|Citation: ||ROWE, A. ... et al, 2012. Microstructural evolution of single crystal and directionally solidified rejuvenated nickel superalloys. IN: Huron, E.S. et al (eds). Superalloys 2012: 12th International Symposium on Superalloys, Seven Springs, PA. John Wiley and sons, pp. 245 - 254.|
|Abstract: ||The possibility of using rejuvenation heat treatments to restore the
original cuboidal ' microstructure from the rafted structure
developed in four different nickel based superalloys during creep
testing at elevated temperatures has been explored in this research.
Creep data are presented for each of four different nickel-based
alloys considered, and the rafting of the ' structure linked to
calculations of the lattice mismatch. An image analysis technique
has been developed for images taken using a scanning electron
microscope in order to rapidly quantify the ' particle size
distributions before and after high temperature heat treatment.
Thermodynamic calculations have been used to determine a
processing window in which high temperature heat treatments can
be carried out in order to re-solution the ' without risk of
incipient melting. These have demonstrated that it is possible to
restore the original ' structure in the case of some of the alloys.
Examination of the interactions of an oxidation resistant coating
with each of the alloys both experimentally and using a combined
thermodynamic and kinetic model has shown slightly different
behaviour depending on the chemical composition of the alloy,
which may impact upon how coated materials are processed to
enable ' rejuvenation. Uncoated regions have also been
considered for one alloy with the aim of minimising surface
recrystallisation and development of detrimental phases during
high temperature processing. The research has shown that it is
possible to determine suitable heat treatment windows to alter '
morphology, quantify these changes and strategies have been
developed to take into account both coated and uncoated surface
interaction effects for potential rejuvenation of components.|
|Description: ||This conference paper is closed access.|
|Version: ||Accepted for publication|
|Appears in Collections:||Closed Access (Materials)|
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