Authors: Pint, B.A.; Walker, L.R.; Wright, I.G.

Source: Materials at High Temperatures, Volume 26, Number 2, July 2009 , pp. 211-216(6)

Publisher: Science Reviews 2000 Ltd

Abstract:

In order to develop an improved oxidation-limited lifetime model, experiments are being conducted to assess the critical factors that affect the rate of Al loss from Fe-base alumina-forming alloys during cyclic oxidation. Both wrought and dispersion strengthened ferritic and intermetallic Fe-Al±Cr alloys are being investigated at exposure temperatures from 1100-1300°C. Higher temperatures, thinner specimens and cycle frequency are used to accelerate degradation during oxidation. However, the effects of these experimental choices often have not been critically assessed in prior work. Electron probe microanalysis has been used to measure the residual Al content under various conditions and at various stages of life. For 0.5-2 mm thick specimens, lifetime repeatedly showed a linear relationship to thickness. Increasing the oxidation temperature appears to be the most viable strategy to accelerate the evaluation of oxidation resistance for comparing and developing alloys.

Keywords: ALUMINA-FORMERS; BREAKAWAY OXIDATION; OXIDE DISPERSION STRENGTHENED; LIFETIME MODEL

Document Type: Research article

DOI: http://dx.doi.org/10.3184/096034009X464401

Publication date: 2009-07-01

More about this publication?

• Materials at High Temperatures serves the needs of those who develop and use materials for high temperature applications. It publishes peer reviewed contributions relating to high temperature applications in the power, chemical, engine, processing and furnace industries.

  The effects of high temperatures on corrosion, fatigue, creep, strength and wear in alloys, intermetallics, ceramics, refractories and composites are covered. Papers dealing with aspects of materials usage including modelling of behaviour and life prediction will be particularly welcome. The journal has a policy of emphasizing practical aspects and authors presenting results from research programmes are encouraged to relate these, if possible, to actual or potential applications.

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