STP610

    Stress-Corrosion Crack Growth in Surface-Cracked Panels of High-Strength Steels

    Published: Jan 1976


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    Abstract

    Stress-corrosion crack growth in 17-4PH and 4340 steels in 3.5 percent sodium chloride solution was examined over a wide range of KIsccys values by electrochemically coupling the 17-4PH steel to aluminum, zinc, magnesium, and open circuit and by testing the 4340 steel at three strength levels in open circuit.

    It was demonstrated that the parameter, KIscc, determined from small cantilever bend specimens can be used to predict the flaw size/stress level combinations required for the onset of crack growth in large surface-cracked tensile panels. For this purpose the stress-intensity values for the surface-cracked panels were calculated from the basic surface-flaw equation.

    The microfracture processes in the stress-corrosion cracking included intergranular, cleavage, and microvoid coalescence, the proportion of intergranular became greater with increase in negative electrochemical potential.

    Keywords:

    stress corrosion, high strength steels, crack propagation, electrochemical coupling, mechanical properties, fractography


    Author Information:

    Shahinian, P
    Consultant and head, Naval Research Laboratory, Washington, D. C.

    Judy, RW
    Consultant and head, Naval Research Laboratory, Washington, D. C.


    Paper ID: STP28675S

    Committee/Subcommittee: G01.06

    DOI: 10.1520/STP28675S


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