Effect of cycle frequency on high-temperature oxidation behavior of alumina-forming alloys

B. A. Pint; P. F. Tortorelli; I. G. Wright

doi:10.1023/A:1016064524521

Effect of cycle frequency on high-temperature oxidation behavior of alumina-forming alloys

B. A. Pint, P. F. Tortorelli, I. G. Wright

Materials Science and Technology Div

Research output: Contribution to journal › Article › peer-review

92 Scopus citations

Abstract

Cycle frequency affects both high-temperature oxidation behavior and the method in which the cyclic test is conducted. Several issues are discussed using examples taken from results for Ni-base and Fe-base, alumina-forming alloys. For alloys that form adherent scales, cycle frequency has little effect on results over extended test times (≥500 hr). When an alloy forms a less adherent scale, reducing the cycle time often has the expected effect of increasing the mass loss per unit exposure time; however, the opposite effect is observed in other cases. Low-frequency cycle experiments can be conducted with specimens contained in alumina crucibles. This has the important benefit of collecting the spalled oxide and measuring the "total" mass gain, equivalent to the metal wastage. However, higher-frequency-cyclic tests cannot be performed with crucibles because of the large thermal mass and thermal-shock problems of alumina crucibles. The test method and cycle frequency ultimately have a strong effect on lifetime predictions.

Original language	English
Pages (from-to)	73-101
Number of pages	29
Journal	Oxidation of Metals
Volume	58
Issue number	1-2
DOIs	https://doi.org/10.1023/A:1016064524521
State	Published - Aug 2002

Funding

The authors are indebted to M. J. Bennett (formerly of Harwell Laboratory, U.K.) who started us on our program on contained cyclic testing. The authors also would like to thank M. Howell, L. D. Chitwood, G. Garner, N. Bonwit, and C. Roberts at ORNL for many hours of assistance with the experimental work and J. R. DiStefano and J. A. Haynes at ORNL for their comments on the manuscript. This research was sponsored by the U.S. Department of Energy, Fossil Energy Advanced Research and Technology Development Materials Program and the Advanced Turbine Systems program under contract DE-AC05-00OR22725 with UT-Battelle, LLC.

Funders	Funder number
Fossil Energy Advanced Research and Technology Development Materials Program	DE-AC05-00OR22725
U.S. Department of Energy

Keywords

Alumina formers: cyclic testing
Cycle frequency
Testing method

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10.1023/A:1016064524521

Cite this

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AB - Cycle frequency affects both high-temperature oxidation behavior and the method in which the cyclic test is conducted. Several issues are discussed using examples taken from results for Ni-base and Fe-base, alumina-forming alloys. For alloys that form adherent scales, cycle frequency has little effect on results over extended test times (≥500 hr). When an alloy forms a less adherent scale, reducing the cycle time often has the expected effect of increasing the mass loss per unit exposure time; however, the opposite effect is observed in other cases. Low-frequency cycle experiments can be conducted with specimens contained in alumina crucibles. This has the important benefit of collecting the spalled oxide and measuring the "total" mass gain, equivalent to the metal wastage. However, higher-frequency-cyclic tests cannot be performed with crucibles because of the large thermal mass and thermal-shock problems of alumina crucibles. The test method and cycle frequency ultimately have a strong effect on lifetime predictions.

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Effect of cycle frequency on high-temperature oxidation behavior of alumina-forming alloys

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