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- W1559032649 abstract "This chapter provides a common way of carrying out cyclic oxidation experiments. Multiple alloy samples are inserted into a furnace and withdrawn again at pre-determined intervals using an electric motor drive and automatic timing device. Heating and cooling are quite rapid, and relatively short cycles can be used. From time to time the experiment is interrupted and the samples withdrawn and weighed. In the continuous thermogravimetric analysis experiment, a microbalance is used to record weight changes during the entire process, cycle after cycle. The chapter considers the diffusion-controlled depletion of protective scale-forming metal within the alloy, and the way in which this is accelerated by spallation and rehealing. To make use of this analysis, it describes the kinetics of scale growth during repeated spallation. Models that have been developed for this purpose are then combined with the subsurface depletion description to arrive at lifetime predictions. The effects of experimental variables, in particular cycle duration and gas composition, on the results of cyclic oxidation exposures are reviewed. Attention is focused on alumina- and chromia-forming alloys. Alumina spallation from ferritic materials and the resulting depletion of aluminium are modeled. A complete analysis of alloy depletion accompanying spallation and rehealing requires an accurate description of diffusion in the subsurface alloy region. The effects of cycling frequency have been examined many times. Cyclic oxidation experiments combine high-temperature reaction with the mechanical effects of thermally induced stress on protective scales, providing a realistic simulation of high-temperature service." @default.
- W1559032649 created "2016-06-24" @default.
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- W1559032649 date "2008-01-01" @default.
- W1559032649 modified "2023-10-16" @default.
- W1559032649 title "Chapter 11 Cyclic Oxidation" @default.
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- W1559032649 doi "https://doi.org/10.1016/s1875-9491(08)00011-2" @default.
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