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    Corrosion-Fatigue Crack Growth Characteristics of Several HY-100 Steel Weldments with Cathodic Protection

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    The corrosion-fatigue crack growth properties of several types of HY-100 steel weldments were studied, primarily in an environment of seawater with cathodic protection by zinc anode. Shielded metal-arc (SMAW), gas metal-arc (GMAW) of both pulsed and spray are processes, and submerged-arc (SAW) weldments were included. The fatigue crack growth tests were conducted on compact specimens removed from the weldments to confine the path of the growing crack in all-weld metal. Constant-amplitude sinusoidal loads were applied at a frequency of 0.17 Hz with a load ratio (minimum-to-maximum) of 0.10.

    In general, fatigue crack growth in weldments was considerably slower than that in HY-100 plate under the same conditions of load and environment, where the applied potential accelerated crack growth rate. The results showed minor differences among the weldments. It was suggested that the residual stress state along the weld centerline, the inhomogeneity of the weld metal with respect to the crack path, defects, and minor porosity all act to retard crack growth, especially at lower stress intensity levels. These factors tend to mask the environmental effects. However, weldments prepared with high heat input showed greater resistance to fatigue crack propagation than weldments prepared at low heat input. The corrosion fatigue crack growth exhibited by the HY-100 weldments was similar to that of HY-80 and HY-130 weldments where weld process, environment, and loading conditions were similar.


    fatigue crack growth, seawater environment, cathodic protection, HY-100 steel, submerged-arc, shielded metal-arc, gas-metal arc, weldments

    Author Information:

    Davis, DA
    Research Metallurgist, David Taylor Naval Ship R&D Center, Annapolis, Md.

    Czyryca, EJ
    Research Metallurgist, David Taylor Naval Ship R&D Center, Annapolis, Md.

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP44813S