STP1298: Crack Initiation in Low Alloy Steel in High Temperature Water

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

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

    Unruh, AD
    San Jose, CA

    Pages: 15    Published: Jan 1997


    Abstract

    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.

    Keywords:

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


    Paper ID: STP19958S

    Committee/Subcommittee: G01.06

    DOI: 10.1520/STP19958S


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