STP600

    Fractography as Related to Macrostructures in Stress Corrosion Cracked Welds in 5Ni-Cr-Mo Steel

    Published: Jan 1976


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    Abstract

    Correlations were found between the fractography of stress corrosion cracked surfaces and the macrostructure of shielded metal arc weldments of a 5Ni-Cr-Mo steel. The fractography of the stress corrosion regions revealed fracture modes consisting of cleavage, microvoid coalescence, and intergranular separation. Cleavage was often associated with a coarse irregular fracture, whereas with microvoid coalescence the fractures were generally flat. Fractures of intergranular separation were characterized by dot-like facets on the macrographs. The macrostructures corresponding to intergranular separation consisted largely of coarse equiaxed grains and to a lesser extent of columnar grains. The latter quite often were too large to be completely revealed by transmission electron microscope fractography and in some instances were more favorably oriented for transgranular failure by cleavage than for intergranular failure.

    Keywords:

    fractography, fractures (materials), crack propagation, stress corrosion tests, weldments


    Author Information:

    Metzbower, EA
    Supervisory metallurgist, Micromechanical Metallurgy Section, Micromechanical Criteria Branch; supervisory research chemist, Corrosion Mechanism Section, Strength of Metals Branch; and metallurgist, Micromechanical Metallurgy Section, Micromechanical Criteria Branch, Engineering Materials Division, Naval Research Laboratory, Washington, D.C.,

    Fujii, CT
    Supervisory metallurgist, Micromechanical Metallurgy Section, Micromechanical Criteria Branch; supervisory research chemist, Corrosion Mechanism Section, Strength of Metals Branch; and metallurgist, Micromechanical Metallurgy Section, Micromechanical Criteria Branch, Engineering Materials Division, Naval Research Laboratory, Washington, D.C.,

    Stoop, J
    Supervisory metallurgist, Micromechanical Metallurgy Section, Micromechanical Criteria Branch; supervisory research chemist, Corrosion Mechanism Section, Strength of Metals Branch; and metallurgist, Micromechanical Metallurgy Section, Micromechanical Criteria Branch, Engineering Materials Division, Naval Research Laboratory, Washington, D.C.,


    Paper ID: STP29191S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP29191S


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