表面改質材のフレッチング損傷 : 非改質材との比較検討

概要

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Eleven modified surfaces including thermochemically treated surfaces, hard coatings and electroplatings were evaluated in terms of fretting damage resistance on fretting test. The damage mechanism of the modified surfaces, especially fretting fatigue crack was also examined in comparison with soft and hard uncoated surfaces. Tested condition is dry at room temperature in air fretted against a bearing steel sphere as a function of normal force, tangential force and repeated cycles. As the results, the chemically modified soft surfaces by salt-bath nitriding and oxy-nitriding showed the best damage resistance without the fatigue crack and corrosion. The fretting fatigue crack of the modified surfaces is deeply related to the contact condition which belongs to elastic or plastic region, and this result is in common with the uncoated surfaces. The factors such as the substrate hardness, hardness ratio of the coating film to the substrate and thickness of the film greatly influence the fretting damage.
1999-10-25