STP868

    Effect of Hydrogen on Crack Initiation and Growth in 18Mn-4Cr Steel

    Published: Jan 1985


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    Abstract

    Hydrogen-assisted cracking in generator rotor end rings is a major concern of the utility industry. To assess the susceptibility of an austenitic 18Mn-4Cr end ring steel to a hydrogen environment, an experimental program was carried out to determine crack initiation and fatigue crack growth properties in hydrogen gas and air. In this program, a peak read detection circuit was designed to determine accurately crack initiation and early crack growth. Test results show that a hydrogen environment does not significantly influence the crack growth rate; however, it reduces the crack initiation life at a low notch root stress range.

    Keywords:

    fatigue, crack initiation, crack growth, hydrogen, end rings


    Author Information:

    Kim, Y-J
    Research Engineer, Unit Head, and Research Technologist, Ontario Hydro Research Laboratory, Toronto, Ontario

    Mukherjee, B
    Research Engineer, Unit Head, and Research Technologist, Ontario Hydro Research Laboratory, Toronto, Ontario

    Carpenter, DW
    Research Engineer, Unit Head, and Research Technologist, Ontario Hydro Research Laboratory, Toronto, Ontario


    Paper ID: STP34251S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP34251S


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