STP801

    Corrosion-Fatigue Behavior of Ti-6Al-4V in a Sodium Chloride Aqueous Solution

    Published: Jan 1983


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    Abstract

    To clarify the influence of NaCl aqueous solution on corrosion-fatigue crack initiation of mill-annealed Ti-6Al-4V, rotating-bending fatigue tests of notched specimens with stress concentration factors in the range of 1.5 to 3.5 were conducted in aerated and deaerated 3% NaCl aqueous solutions at 80°C. Ultrasonic fatigue tests up to 1010 cycles were also conducted in aerated 3% NaCl aqueous solution at room temperature.

    Fatigue limits in air and corrosion-fatigue strength at 108 cycles decreased with increases in the stress concentration factor. The reduction in fatigue strength of the notched specimen (Kt = 3.5) by the environments at 5 × 107 cycles was at most 20%. No influence of dissolved oxygen content was observed. Corrosion pits were not observed at crack initiation sites.

    In the propagation area, striation predominantly appeared regardless of environment. It was concluded that corrosion-fatigue crack initiation of the notched Ti-6Al-4V was predominantly influenced by the stress concentration factor and not by Cl ions or dissolved oxygen content in the NaCl aqueous solution. It was also concluded that fatigue crack initiation of Ti-6Al-4V was not significantly influenced by the NaCl aqueous solution at room temperature even in long fatigue life (up to 1010 cycles).

    Keywords:

    Ti-6Al-4V, corrosion fatigue, stress concentration factor, dissolved oxygen content, fatigue crack initiation, ultrasonic fatigue


    Author Information:

    Ebara, R
    Senior Research Engineer and Engineer, Hiroshima Technical Institute, Mitsubishi Heavy Industries Ltd., Hiroshima,

    Yamada, Y
    Senior Research Engineer and Engineer, Hiroshima Technical Institute, Mitsubishi Heavy Industries Ltd., Hiroshima,

    Goto, A
    Senior Research Engineer and Engineer, Hiroshima Technical Institute, Mitsubishi Heavy Industries Ltd., Hiroshima,


    Paper ID: STP44810S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP44810S


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