Abstract
Fretting fatigue tests of high strength steels having ultimate tensile strengths of 490, 690 and 880 MPa were carried out in sea water under free corrosion condition, and the effect of fretting damage on fatigue life was investigated. At high stress amplitudes, the higher the strength of steel, the longer the fretting fatigue life in sea water, and the fretting fatigue life in sea water was almost the same as that in air. At low stress amplitudes, the fretting fatigue life of all the steels in sea water decreased to 10-20% of the plain corrosion fatigue life and showed almost the same life irrespective of the strength of steel. The fretting fatigue life in sea water was much shorter than that in air, and the fretting fatigue strength at 107 cycles in sea water was lower than that in air. The saturation of fretting fatigue demage occurred beyond a certain number of fretting cycles. For 880 MPa grade steel, the smallest number of fretting cycles to cause the saturation of damage in sea water was less than 0.005% of the fretting fatigue life, but that in air was about 30%. It was shown that the fatigue life in sea water was reduced by the fretting damage produced by a small number of fretting cycles.
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