STP171: Effect of Strain on the Oxidation of Nickel-Chromium Heater Alloys

    Gulbransen, Earl A.
    Westinghouse Research Labs., East Pittsburgh, Pa.

    Andrew, Kenneth F.
    Westinghouse Research Labs., East Pittsburgh, Pa.

    Pages: 14    Published: Jan 1955


    Abstract

    To give a more complete picture of the physical and chemical factors involved in high-temperature oxidation, a new test method was developed called “strain-oxidation.” In this test the metal is oxidized a given amount, strained 1 to 4 per cent, and then reoxidized. The rates of oxidation before and after strain are carefully measured. Five nickel-chromium heater alloys of varying silicon and manganese compositions are studied. Two kinds of damage in the oxide film are found as a result of strain. The first is shown by a rapid rate of oxidation on first reoxidizing the metal while the second involves a long-term effect. Results on the high-silicon alloys show that strain has only a minor effect on the rate of oxidation. The strain-oxidation tests show good correlation with the ASTM useful life tests and suggest that the resistance of the alloy to stress during oxidation is relatively more important than the rate of oxidation at a given temperature.


    Paper ID: STP46830S

    Committee/Subcommittee: E01.08

    DOI: 10.1520/STP46830S


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