STP801

    Some Electrochemical and Microstructural Aspects of Corrosion Fatigue

    Published: Jan 1983


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    Abstract

    The initiation of corrosion-fatigue cracks in pure aluminum single crystals, polycrystalline aluminum, and in a BS4360 50D steel has been investigated. Experiments were performed in 3.5% sodium chloride solution, and measurements of the rate of nucleation and early growth of cracks were obtained by quantitative metallography. Initiation occurred at persistent slip bands or grain boundaries in aluminum but at inclusions in the steel.

    The role of microstructure in corrosion fatigue crack initiation is discussed. It is suggested that the growth rate of short cracks may be controlled by chemical dissolution. Results from straining electrode experiments on high yield strength steels are described that support this conclusion.

    Keywords:

    corrosion fatigue, crack initiation, 3.5% sodium chloride, aluminum, single crystal, carbon-manganese steel, straining electrode, inclusions


    Author Information:

    Congleton, J
    University of Newcastle upon Tyne, Newcastle upon Tyne,

    Craig, IH
    University of Newcastle upon Tyne, Newcastle upon Tyne,

    Olieh, RA
    University of Newcastle upon Tyne, Newcastle upon Tyne,

    Parkins, RN
    University of Newcastle upon Tyne, Newcastle upon Tyne,


    Paper ID: STP44820S

    Committee/Subcommittee: G01.11

    DOI: 10.1520/STP44820S


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