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Rolling-contact fatigue life tests were studied to evaluate the effect of nonmetallic inclusions in bearing steels similar to AISI 52100.
Fatigue tests were conducted on a test machine that was composed of a round disk specimen substituted for the housing washer of a thrust ball bearing. The specimen was loaded at 455 and 500 kg/mm2 (4.46 × 109 and 4.90 × 109 N/m2) in maximum hertzian stress, lubricated with spindle oil, and operated at room temperature.
The results of the fatigue tests showed that alumina-type inclusions were very harmful to fatigue life, but sulfide inclusions not only had no influence but increased the fatigue life in air-melted and even vacuum-melted steels. In electro-slag remelting steel, increased fatigue life indicated the possibility of effects with the exception of nonmetallic inclusions.
inclusions, fatigue (materials), bearings, aluminum oxide, sulfides, vacuum melting
Chief engineer, Material Section, Research Laboratory, Kanagawa-ken,
General manager, Sanyo Special Steel Company, Hyogo-Ken,