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    Crack Initiation in Low Alloy Steel in High Temperature Water

    Published: Jan 1997

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    This paper describes a study of fatigue crack initiation in WB36, a German low alloy steel, tested in high temperature, high purity, water. Flat un-notched, tensile specimens were cycled under load control, with R=0.1, and with a saw-tooth wave form (with a loading time of 30 seconds and an unloading time of 3 seconds). Crack initiation was followed by periodically stopping the test and replicating the surface. The tests were performed at 177°C, in water containing 8ppm O2. H2SO4 additions were also made in some tests to raise the conductivity of the water from 0.06 μS/cm to 0.4–0.5μS/cm. The crack initiation and growth data are correlated with the water chemistry of the test.


    Low Alloy Steel, fatigue, high temperature water, pitting, crack initiation, crack growth, stress intensity, ASME section III code, ASME section XI code

    Author Information:

    Solomon, HD
    GE R&D Center, Schenectady, NY

    DeLair, RE
    GE R&D Center, Schenectady, NY

    Unruh, AD
    San Jose, CA

    Committee/Subcommittee: G01.06

    DOI: 10.1520/STP19958S

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