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Microstructural evolution in coated single crystal Ni-based superalloys

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posted on 25.07.2013, 10:53 by Sarah L. Ogden
Ni-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 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.



  • Aeronautical, Automotive, Chemical and Materials Engineering


  • Materials


© Sarah Louise Ogden

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A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.

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