Strain-controlled fatigue properties of Ti 3Al based alloy : Cao, J., Sun, F., Cao, C. and Gao, Y. Xiyou Jinshu Cailiao yu Gongcheng (Rare Metal Materials and Engineering) (1996) 25, 17–20

Abstract

This work has evaluated the rolling-contact fatigue lives of AISI 52100 steel balls with several mineral and synthetic oils with and without additive using a four-ball tester. The studied lubricants include S.N.-350 (mineral oil), S.N.-600 (mineral oil), TMP-05 (synthetic polyol ester), TMP-05 + 2%ZnDDP, P.A.G.-9 (synthetic polyalkyl glycol), P.A.G.-12 (synthetic polyalkyl glycol) and Breox-B-135X (synthetic polyalkyl glycol). Weibull plots and S-N (stress-number of cycles) of L10 and L50 are given to all the tested oils. Pressure-viscosity coefficients for different tested oils are estimated experimentally for understanding the fatigue test results. The results indicate: (1) synthetic polybutene HYVIS-07 gives the longest rolling-contact fatigue life to AISI 52100 steel balls among all the mineral and synthetic oils studied in the present work, which may be attributed to its highest pressure-viscosity coefficient among the tested oils; (2) the rolling fatigue performance of a synthetic oil can be better or worse than that of a mineral oil, depending on the nature of the synthetic oil family. The capability of improving the rolling fatigue lives of tested mineral and synthetic oils increases in the order synthetic polyol ester, synthetic polyalkyl glycol, mineral oil, and synthetic polybutene; (3) a higher viscosity oil will lead to a longer rolling life, but the influence of viscosity in synthetic oil on the rolling fatigue life of steel balls will be less than that of changing synthetic oil family; (4) synthetic oil with E.P. antiwear additive has al longer rolling fatigue life compared with the case without additive.