Abstract
The rolling contact fatigue endurance of case-hardened powder forged Fe–2Ni–0.5Mo and Fe–0.7Mn–1Cr–0.2Mo steels is presented. The contact fatigue endurance of the Fe–Mn–Cr–Mo powder steel is higher than that of the Fe–Ni–Mo and of wrought bearing steel. The basic data of 17 powder forged outer and inner bearing rings are given. The durability of case-hardened powder forged rings reached the basic dynamic load rating up to ∼150% for Fe–Ni–Mo steel and up to ∼200% for Fe–Mn–Cr–Mo steel. Beside the rolling stress conditions, there are some special powder metallurgy reasons for failure of the rings by spalling which are initiated to a certain depth below the raceway in the zone of maximum shear stresses. These are pores, “free” unforged surfaces, hard white etching areas with microcracks in the form of white bands and/or butterflies generated by pores. The highest durability was recorded for the rings with transcrystalline ductile morphology verified on failure tested rings. Failure of the rings can be minimized by manufacturing under optimal technological conditions.
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