STP1058

    Fatigue of Welded Structural and High-Strength Steel Plate Specimens in Seawater

    Published: Jan 1990


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    Abstract

    Corrosion fatigue data for three series of experiments involving a butt-welded structural and nine higher strength steels (yield stress, 370 to 750 MPa)—with the latter representing relatively new strengthening technologies such as microalloying, control rolling, thermomechanical control processing, and precipitation hardening—have been evaluated comparatively. Variables in the tests included: (1) the R ratio, (2) the as-welded versus ground and postweld heat-treated conditions, and (3) freely corroding versus cathodically protected conditions, although the nature and duration of the experiments was not conducive to a systematic treatment of these factors. Fatigue life data for the freely corroding specimen experiments reflected an influence of the weld toe geometry and the associated stress-concentration factor for as-welded specimens and of the R ratio for postweld heat-treated ones. On the other hand, no effect of the material strength was apparent. Limited data for the cathodically polarized specimens indicated improvement in fatigue life over that for the freely corroding specimens and for higher strength steels over structural steels.

    Keywords:

    weldments, structural steels, high-strength steels, welded steels, fatigue, residual stress, stress concentration, seawater, cathodic protection, postweld heat treatment, stress ratio


    Author Information:

    Sablok, AK
    Center for Marine MaterialsFlorida Atlantic University, Boca Raton, FL

    Hartt, WH
    Center for Marine MaterialsFlorida Atlantic University, Boca Raton, FL


    Paper ID: STP24091S

    Committee/Subcommittee: E08.93

    DOI: 10.1520/STP24091S


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