首页|Stresses Developed within Thermally Grown Oxides on a Coated Superalloy Substrate

Stresses Developed within Thermally Grown Oxides on a Coated Superalloy Substrate

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Residual macro-stresses have to be evaluated using trial samples that comprise a CMSX4 superalloy coated with either a RT22 or a CN91 bond-coat. The samples were exposed in air to a matrix of temperatures, in the range 850℃ to 1050℃, and times extending upto 4000hrs to produce thermally grown oxide. This oxide is essentially Al_2O_3 which allows stresses to be measured by photoluminescence spectroscopy. In addition, Raman spectroscopy and X-ray diffraction have been used to characterise the oxides formed. The results are discussed with respect to confidence in the measurements, changes in stress with temperature and exposure time and the potential for photoluminescence spectroscopy to be used to measure stresses for service components.

turbine bladethermally grown oxideresidual stressphotoluminescence/Raman spectroscopysuperalloy

G Hilson、PEJ Flewitt

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Interface Analysis Centre, University of Bristol, Bristol BS28BS, UK Frazer-Nash Consultancy Limited, Dorking Business Park, Dorking, RH4 1HJ, UK

Interface Analysis Centre, University of Bristol, Bristol BS28BS, UK Dept of Physics, H H Wills Laboratory, University of Bristol, Bristol, BS8 1TL, UK

2010

Key engineering materials

Key engineering materials

ISSN：1013-9826
年,卷(期)：2010.417/418