Abstract
The fatigue and wear characteristics of AISI VIM-VAR M50 steel were evaluated using two high-temperature synthetic turbine engine lubricants. Rolling contact fatigue (RCF) tests were conducted on a ball-on-rod type rig at a cyclic Hertzian contact stress of 4.8 GPa (700 ksi) and temperatures of 177 °C (350 °F) and 274 °C (525 °F). The two lubricants tested included a five-ring polyphenylether (MIL-L-87100, 12.64 cSt at 100 °C) and perfluoropolyalkylether (25.51 cSt at 100 °C). RCF results were compared with those obtained with a polyolester (MIL-L-7808J) at 177 °C. Weibull analysis and analysis of variance conducted on the RCF data show significant increases in fatigue life and reductions in wear rate when compared with MIL-L-7808J lubricant at 177 °C. However, at 274 °C, fatigue life was substantially reduced and wear of M50 steel increased with both high-temperature lubricants.
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