STP610

    An Evaluation of Rising Load KIscc Testing

    Published: Jan 1976


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    Abstract

    This report presents a detailed evaluation of the rising load, accelerated KIscc testing procedure proposed by McIntyre and Priest. Conventional long hold-time “bolt loaded” KIscc tests were conducted with 160 and 180-ksi yield-strength Type 4340 steel exposed to seawater, hydrogen, and hydrogen sulfide gas environments, and the results of these tests compared with similar data generated under rising load conditions. The results show that rising load KIscc testing in hydrogen sulfide gas can be used as a valuable technique for rapidly screening structural alloys with regard to their susceptibility to environment induced cracking in hydrogen bearing environments. However, this testing procedure cannot always be used to develop a quantitative measure of KIscc. Specifically, it is shown that for steels below about 200 ksi in yield strength, the KIscc measured in hydrogen sulfide gas is not the same as that measured in other hydrogen bearing environments (hydrogen and seawater). In addition, it is shown that gas pressure and loading rate can have a significant effect on the apparent KIscc measured under rising load conditions.

    Keywords:

    stress corrosion, environments, crack propagation, seawater, toughness, mechanical properties, gases, hydrogen, hydrogen sulfide


    Author Information:

    Clark, WG
    Fellow engineers, Westinghouse Research Laboratories, Pittsburgh, Pa.

    Landes, JD
    Fellow engineers, Westinghouse Research Laboratories, Pittsburgh, Pa.


    Paper ID: STP28674S

    Committee/Subcommittee: G01.06

    DOI: 10.1520/STP28674S


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