Abstract
Objective of the present experimental investigation is to clarify the influence of the moist air relative humidity (RH = 10-70%) on the properties of fretting friction and wear of steels under grease lubrication. Ball-on-disk type fretting wear tests, for various amounts of grease supplied before each test at the punctual contact between ball and disk, were conducted at 50 microns relative slip amplitude. Ball was made of SUJ2 bearing steel and the disk was made of S15C carbon steel. Maximum values of the friction coefficient and the disk wear rate decrease at augmentation of the grease amount. Wear rate appears as unaffected by the RH variation for an amount of grease exceeding 0.02 g, this representing the minimum amount necessary to avoid grease film breakdown.
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