Abstract
The fatigue and wear characteristics of AISI VIM-VAR M50 steel were evaluated using a fully formulated polyolester based lubricant conforming to MIL-L-7808K (4 cSt at 100°C) specification. Tests were conducted using a rolling contact fatigue test rig of the ball-on-rod type at a cyclic maximum Hertzian stress level of 4.8 GPa (700 Ksi) and temperatures of 23° and 177°C. Rolling contact fatigue life results were compared with a fully formulated polyolester conforming to the MIL-L-7808J (3.2 cSt at 100°C) specification. The results suggest that rolling contact fatigue life and wear volume per stress cycle in the boundary lubrication regime are affected by lubricant type and temperature. MIL-L-7808K exhibited statistically significant superior fatigue life and lower wear rate at both temperatures when compared to MIL-L-7808J. Also, there was some correlation found between wear and fatigue life. A separate set of tests were conducted to measure rolling contact friction. Of the two lubricants evaluated, MIL-L-7808J showed the lowest average rolling contact friction.
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