This paper presents the rolling contact fatigue (RCF) life performance of martensitic stainless steel Pyrowear 675 (P675). Two heat treatment versions of P675 were evaluated for RCF life in a hybrid configuration (silicon nitride rolling elements). The results are compared to AISI M50 steel in an all-metal and hybrid configuration. RCF life testing was conducted using a ball-on-rod tester at maximum Hertzian contact stress values of 5.5 GPa (hybrid) and 4.8 GPa (all-metal). Hybrid P675 showed a significant improvement in fatigue life and rolling wear resistance compared to all-metal M50 and hybrid M50. Posttest analysis showed the formation of white etching regions (WERs)/dark etching regions (DERs) and white etching cracks (WECs) in all materials tested. Auger electron spectroscopy (AES) depth profiling showed the presence of a phosphorus-rich film, suggesting material surface reactions with the antiwear additive present in the lubricant.
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