Stresses Developed within Thermally Grown Oxides on a Coated Superalloy Substrate

G Hilson, PEJ Flewitt

Research output: Contribution to journalArticle (Academic Journal)

Abstract

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 degrees C to 1050 degrees C, and times extending upto 4000hrs to produce thermally grown oxide. This oxide is essentially Al2O3 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.
Translated title of the contributionStresses Developed within Thermally Grown Oxides on a Coated Superalloy Substrate
Original languageEnglish
Pages (from-to)5 - 8
Number of pages4
JournalKey Engineering Materials
Volume417-418
Publication statusPublished - 2010

Bibliographical note

Editors: Aliabadi MH; Abela S; Baragetti S; Guagliano M; Lee HS
Publisher: TRANS TECH PUBLICATIONS LTD, LAUBLSRUTISTR 24, CH-8717 STAFA-ZURICH, SWITZERLAND
Name and Venue of Conference: 8th International Conference on Fracture and Damage Mechanics
Name and Venue of Event: MALTA, SEP 08-10, 2009

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