Oxidation growth stresses in an alumina-forming ferritic steel measured by creep deflection
- Centre for Materials Measurement and Technology, Middlesex (United Kingdom); and others
Deflection tests have been used to estimate the stresses developed in the alumina layer formed during short-term oxidation of a Fe-22Cr-5Al-0.3Y Fecralloy steel at 1000{degrees}C. Elastic analysis of the deflecting specimen is inappropriate under these test conditions because of the low creep strength of the alloy. Accordingly, a recent creep analysis has been used in this work using currently determined creep properties of the alloy substrate. The results of the analysis show that for the thin oxides produced (< 1 {mu}m), the planar stress within the oxide layer is everywhere compressive. Average values are approximately 850 MPa after 0.5 hr oxidation but reduce to < 200 MPa after 6.5 hr. These values are very much less than would be expected under conditions of elastic deformation.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 563584
- Journal Information:
- Oxidation of Metals, Vol. 48, Issue 3-4; Other Information: PBD: Oct 1997
- Country of Publication:
- United States
- Language:
- English
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