STP108

    Preliminary Studies of the Effect of Oxidizing Sulfurous Atmospheres on the Rupture Strengths of Inconel “X” and Inconel

    Published: Jan 1951


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    Abstract

    While purporting to yield practical information on the mechanical properties of heat-resistant alloys at elevated temperatures, the usual creep and stress-rupture testing procedures generally make no attempt to simulate the corrosive conditions to be expected in the actual service environment. For some time it has been realized that the high-temperature corrosion resistance to various specific media is an aspect which cannot be safely ignored in the application of this type of alloy to high-temperature service. Resistance to oxidation, sulfidation, carburization, or to attack by steam, leaded fuel combustion products, or nitrogenous atmospheres or even, in certain less common cases, to halogen-containing gases, all are factors which the design engineer should consider to be of importance comparable to the strength properties. The corrosive action of sulfurous compounds in the environment on the rupture strength has been of particular interest because of the prevalence of this element in many of the lower grades of fuels. For example, it is a well-known fact that heat-resistant compositions high in nickel are prone to a more or less severely embrittling type of corrosion when exposed to hot sulfur-containing gases. This has led to speculation that the practical usefulness of these materials would be questionable, especially in gas turbine applications which contemplate, for reasons of economy, the use of low-grade heavy oil or pulverized coal — both containing appreciable amounts of sulfur. Previous tests usually have considered either the stress-elongation or rupture relationships on the one hand, or the probable corrosion mechanism on the other, but relatively few attempts have been made to study these two important factors of stress and high-temperature corrosion simultaneously. In an effort to devise a practical approach to this problem, a limited number of stress-rupture tests have been made on Inconel, a high-nickel heat-resistant alloy, and on Inconel “X”, its age-hardenable counterpart, in oxidizing sulfurous atmospheres with and without added water vapor. The data obtained, while of limited scope, suggest certain interesting conclusions which may become the basis of a more intensive study.


    Author Information:

    Talbot, A. M.
    The International Nickel Co., Inc., Bayonne, N. J.

    Skinner, E. N.
    The International Nickel Co., Inc., Bayonne, N. J.


    Paper ID: STP46731S

    Committee/Subcommittee: G01.04

    DOI: 10.1520/STP46731S


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