Thesis-2007-Oates.pdf (42.43 MB)
Download file

Microstructural changes as a time temperature indicator in cobalt superalloys and a NiCoCrAlTaY coating

Download (42.43 MB)
thesis
posted on 10.07.2014, 14:52 by David L. Oates
Gas 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. Oates

Publication date

2007

Notes

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.603100

Language

en

Usage metrics

Keywords

Exports