Simultaneous creep and oxidation of an Fe–5AL alloy at 973–1073 K

Authors: Rolls, R.; Madueke, C. S.

Source: Materials Science and Technology, Volume 1, Number 2, February 1985 , pp. 152-155(4)

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Abstract:

Studies of the simultaneous creep and oxidation of an Fe-5Al alloy at constant stresses of 12 and 16 MN m⁻² in the temperature range 973-1073 K have shown that the steady-state creep obeys a power law. The stress exponent n was found to lie between 5 and 7. The apparent activation energy for creep was in the range 77–397 kJ mol⁻¹ and depended on the oxygen partial pressure Po₂ of the test environment. The oxidation strengthening (steady-state creep rate ε decreasing) was found for an applied stress of 16 MNm⁻² for Po₂ in the range 10⁻⁷ to 1·013 × 10⁵ Pa. At 12 MN m⁻², strengthening occurred only in the range 973–1023 K; weakening was found at 1073 K. The primary causes of strengthening are believed to be the mechanical constraint of strongly adherent scales and internal oxide-dislocation interactions.

MST/133

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/026708385790086948

Publication date: 1985-02-01

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