| 摘要 |
This bearing component has exceptional rolling contact fatigue life, even in environments infiltrated by foreign matter. The bearing component contains the chemical components, expressed in weight percent, of C: 0.95-1.10%, Si: 0.10-0.70%, Mn: 0.20-1.20%, Cr: 0.90-1.60%, Al: 0.010-0.100%, and N: 0.003-0.030%, as well as containing P in an amount limited to 0.25% or less, S to 0.025% or less, and O to 0.0010% or less, and Mo, B, Cu, Ni, and Ca in any prescribed amount, with the remainder being Fe and impurities. The metal texture is residual austenite, globular cementite, and martensite, the amount of residual austenite, expressed in volume percent, being 15-25%. The average grain size of the prior austenite is 8.0 μm or less. The number density of voids having a size of 0.02-3.0 μm, inclusive, expressed as the equivalent circle diameter, is 2000/mm2 or less. |
