129 Effect of Environment on Fretting Fatigue Strength of Cast Al-Si Aluminum Alloy

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Abstract

Plain fatigue and fretting fatigue tests of cast and forged aluminum alloys were carried out in air and calcium chloride solution. Although plain fatigue strength of the cast alloy was significantly low compared to that of forged one, fretting fatigue strength of cast alloy was almost equal to that of forged one in air. Fretting fatigue strengths of both alloys in calcium chloride (CaCl_2) solution were lower than those in air. Measurement of tangential force coefficient and SEM observations of surface were also carried out to discuss the effect of environment on fretting fatigue characteristics. Tangential force coefficient of both alloys in the environment was nearly equal to that in air. Though all of the fretting fatigue cracks for cast aluminum alloy initiated near the edge of the contact region, some fretting fatigue cracks for forged aluminum alloy in CaCl_2 solution were not fretting part in this study. In the cast aluminum alloy, the casting defect seemed to have no significant influence on the initiation of fretting fatigue cracks and the sensitivity of fretting and corrosion in the low stress amplitude regime is small in comparison with that for the forged aluminum alloy.

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