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51316-7344-Effect of Cycle Frequency on the Oxidation Resistance of Ni- and Fe-based Alloys at 982oC

This paper focuses on short-term oxidation testing (1,000 hours) of Ni- and Fe based heat-resistant alloys in flowing air with varying cycle frequencies (1, 10, and 168 hours) at 982 °C. The alloys tested were ranked based on weight change behavior and metal recession measurements.

Product Number: 51316-7344-SG
ISBN: 7344 2016 CP
Author: Joseph Meyer
Publication Date: 2016
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Operating conditions can have significant effect on the expected lifetime of components. The frequency of thermal cycling due to shutdowns or varying process parameters in particular has an effect on the oxidation behavior of heat-resistant alloys. Generating oxidation data under varying thermal cycle frequencies is then necessary to determine what alloys provide acceptable oxidation resistance in these environments. This paper focuses on short-term oxidation testing (1,000 hours) of Ni- and Fe based heat-resistant alloys in flowing air with varying cycle frequencies (1, 10, and 168 hours) at 982 °C. The alloys tested were ranked based on weight change behavior and metal recession measurements. It was found that increasing cycle frequency increased the rate constants in the parabolic region of the weight change curves in all of the alloys tested. Metal recession and internal oxidation increased with increasing cycle frequency, but this was found only in alloys that were already susceptible to accelerated oxidation at 982 °C.

Key words: downloadable, Cyclic Oxidation, Nickel Alloys

 

Operating conditions can have significant effect on the expected lifetime of components. The frequency of thermal cycling due to shutdowns or varying process parameters in particular has an effect on the oxidation behavior of heat-resistant alloys. Generating oxidation data under varying thermal cycle frequencies is then necessary to determine what alloys provide acceptable oxidation resistance in these environments. This paper focuses on short-term oxidation testing (1,000 hours) of Ni- and Fe based heat-resistant alloys in flowing air with varying cycle frequencies (1, 10, and 168 hours) at 982 °C. The alloys tested were ranked based on weight change behavior and metal recession measurements. It was found that increasing cycle frequency increased the rate constants in the parabolic region of the weight change curves in all of the alloys tested. Metal recession and internal oxidation increased with increasing cycle frequency, but this was found only in alloys that were already susceptible to accelerated oxidation at 982 °C.

Key words: downloadable, Cyclic Oxidation, Nickel Alloys

 

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