STP856

    Effects of Strain Aging in the Unloading Compliance J Test

    Published: Jan 1985


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    Abstract

    The behaviors of two heats of SA 515 Grade 70 in the unloading compliance J test were compared. Tensile properties were measured for both heats of material; one heat was found to be susceptible to dynamic strain aging. This heat also exhibited a steeper drop in the slope of the JI-R curve with increasing temperature, and serrated flow during the high-temperature J tests. The magnitude of the serrations varied during each test and with changes in loading displacement rate. Comparison with data from other carbon steels and weld metals showed that a large JIc drop with increasing temperature was associated with a large drop in ductility. J tests of strain-aging susceptible materials also showed a marked decrease in load drop from relaxation and peaks in load upon reloading at temperatures at the lower end of the temperature range of dynamic strain aging.

    Keywords:

    strain aging, steels, tensile properties, unloading compliance, ductile fracture, toughness


    Author Information:

    Miglin, MT
    Research metallurgist, technical advisor, research metallurgist, and supervisor, Babcock & Wilcox, a McDermott Company, Alliance, OH

    Van Der Sluys, WA
    Research metallurgist, technical advisor, research metallurgist, and supervisor, Babcock & Wilcox, a McDermott Company, Alliance, OH

    Futato, RJ
    Research metallurgist, technical advisor, research metallurgist, and supervisor, Babcock & Wilcox, a McDermott Company, Alliance, OH

    Domian, HA
    Research metallurgist, technical advisor, research metallurgist, and supervisor, Babcock & Wilcox, a McDermott Company, Alliance, OH


    Paper ID: STP34523S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP34523S


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