Thesis-2007-Ogden.pdf (86.05 MB)
Microstructural evolution in coated single crystal Ni-based superalloys
thesis
posted on 2013-07-25, 10:53 authored by Sarah L. OgdenNi-based superalloys are primarily used in the manufacturing of critical gas turbine
components, such as rotating blades. The drive for increased efficiency has led to a continuous
rise in engine operating temperatures, and therefore these components are exposed to
conditions that can ultimately compromise their mechanical integrity and therefore limit their
service life. There is a desire to extend the component's life and also to avoid any premature
failures, and therefore understanding of the material's stability and properties throughout
component life is increasingly important.
The identification of features in the microstructure of Ni-based superalloys which change
systematically with time and temperature may allow it to be used as a 'time-temperature'
recorder. This could enable a determination of the effective temperature a component will
have experienced, and in conjunction with known values of operating stress, an estimate of the
remaining service life can be made....cont'd
Funding
Funding for this work from the Engineering and Physical Sciences Research Council under [grant number GRlS86334/01] and the support of the following companies, Alstom, Chromalloy, E.On UK, Howmet (Alcoa), Mitsui Babcock, National Physical Laboratory, QinetiQ, RWE npower, Rolls Royce and Siemens are gratefully acknowledged.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Materials
Publisher
© Sarah Louise OgdenPublication date
2007Notes
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.EThOS Persistent ID
uk.bl.ethos.572821Language
- en