Thesis-2007-Oates.pdf (42.43 MB)
Microstructural changes as a time temperature indicator in cobalt superalloys and a NiCoCrAlTaY coating
thesis
posted on 2014-07-10, 14:52 authored by David L. OatesGas turbines in power generation systems use both nickel and cobalt-based superalloys for
vanes, blades, discs and combustion chamber components. Cobalt-based superalloys have
the advantage over nickel based superalloys in that they have a higher thermal conductivity
and hence a greater thermal shock resistance, a greater resistance to thermal fatigue and
also a better corrosion resistance. However, in some applications coatings have to be applied
to such alloys because of their poor oxidation resistance. The creep strength of cobalt-based
superalloys depends primarily on solid solution strengthening and the interaction between the
hard carbides and alloy defects, such as dislocations and stacking faults.
There is a need to develop an understanding of the microstructural changes that occur in
cobalt-based superalloys, with both time and temperature, for life prediction, refurbishment
and failure investigations... cont'd.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Materials
Publisher
© David L. OatesPublication date
2007Notes
A Doctoral Thesis. Submitted in partial fulfillment of the requirements for the award of Doctor of Philosophy of Loughborough University.EThOS Persistent ID
uk.bl.ethos.603100Language
- en