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Non-Invasive Temperature Measurements by Neutron Diffraction in Aero-Engine Components

Published online by Cambridge University Press:  06 March 2019

T. M. Holden ,
J. H. Root ,
D. C. Tennant  and
D. Leggett
T. M. Holden
Affiliation:
AECL Research, Chalk River, OntarioCanada K0J 1J0
J. H. Root
Affiliation:
AECL Research, Chalk River, OntarioCanada K0J 1J0
D. C. Tennant
Affiliation:
AECL Research, Chalk River, OntarioCanada K0J 1J0
D. Leggett
Affiliation:
Pratt and Whitney Inc., 1000 Marie-Victorin, LongueuilQuebec Canada J4G 1A1
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Abstract

A requirement exists in the aeronautical industry for measuring temperature non-invasively in critical components, such as the turbine disc in an operating engine. Neutron diffraction, unique among nuclear techniques, offers the possibility of measuring both temperature and strain within an operating engine by virtue of the high penetration of neutrons through industrial materials. Static diffraction experiments on Waspaloy and Ti6A14V showed, by comparison with thermocouples, that both the diffraction peak position and the peak intensity can measure the tempeiaturc to within ±6 K aL 800 K. Measurements on a rotating Waspaloy disc, heated from its rim, showed that temperature gradients could be determined accurately by lattice parameter measurements. The large grain size in Waspaloy prevented accurate peak intensity measurements in this dynamic test. Finally, the structures within a small Pratt & Whitney engine in its equatorial plane were mapped by mounting the engine on an X-Y translator on the diffractometer and moving it through a grid of positions. Possible future directions in the field will be discussed.

Type
I. Dynamic Characterization of Materials by Powder Diffraction
Information
Advances in X-Ray Analysis , Volume 38: Forty-third Annual Conference on Applications of X-ray Analysis , 1994 , pp. 9 - 20
Copyright
Copyright © International Centre for Diffraction Data 1994

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