STP462: Effects of Notches and Saltwater Corrosion on the Flexural Fatigue Behavior of High-Strength Structural Alloys

    Schwab, RC
    Metallurgist, Materials LaboratoryNaval Ship Research and Development Center, Annapolis, Md.

    Czyryca, EJ
    Metallurgist, Materials LaboratoryNaval Ship Research and Development Center, Annapolis, Md.

    Pages: 14    Published: Jan 1970


    Abstract

    The effects of mechanical notches and saltwater corrosion on the flexural fatigue behavior of seven high-strength structural alloys were investigated over a broad life range of 1,000 to 100 million cycles. The seven alloys (three ferrous, three titanium, and one aluminum) had approximately the same ratio of yield strength to density.

    Results showed that notches were most damaging in the high-cycle life range, and that only titanium alloys exhibit a fatigue limit when subjected to corrosion fatigue. When compared on the basis of fatigue strength in air, the high-strength steels are superior over the entire life range. If, however, comparisons are made on the basis of ratio of fatigue strength to density, all seven alloys are approximately equal. The comparison of fatigue strength and ratio of fatigue strength to density over the broad life range for corrosion fatigue shows the titanium alloys to be superior at intermediate and long lives.

    Keywords:

    aluminum alloys, corrosion fatigue, high-cycle fatigue, high-strength steels, low-cycle fatigue, maraging steels, notch effect, titanium alloys, tests


    Paper ID: STP32043S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP32043S


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