17-11-2016 дата публикации
Номер: US20160333438A1
A bearing part according the present invention includes, as the chemical composition, by mass %, C: 0.95% to 1.10%, Si: 0.10% to 0.70%, Mn: 0.20% to 1.20%, Cr: 0.90% to 1.60%, Al: 0.010% to 0.100%, N: 0.003% to 0.030%, P: 0.025% or less, S: 0.025% or less, O: 0.0010% or less, and optionally Mo: 0.25% or less, B: 0.0050% or less, Cu: 1.0% or less, Ni: 3.0% or less, and Ca: 0.0015% or less, and a remainder including Fe and impurities; metallographic structure includes a retained austenite, a spherical cementite and a martensite; an amount of the retained austenite is 15% to 25%, by volume %; an average grain size of prior-austenite is 8.0 μm or less; and a number density of a void having a circle equivalent diameter of 0.02 μm to 3.0 μm is 2000 mmor less in the metallographic structure. 1. A bearing part comprising , as a chemical composition , by mass % ,C: 0.95% to 1.10%,Si: 0.10% to 0.70%,Mn: 0.20% to 1.20%,Cr: 0.90% to 1.60%,Al: 0.010% to 0.100%,N: 0.003% to 0.030%,P: 0.025% or less,S: 0.025% or less,O: 0.0010% or less, andoptionallyMo: 0.25% or less,B: 0.0050% or less,Cu: 1.0% or less,Ni: 3.0% or less, andCa: 0.0015% or less, anda remainder including Fe and impurities,wherein a metallographic structure includes a retained austenite, a spherical cementite and a martensite,wherein an amount of the retained austenite is 15% to 25%, by volume %,wherein an average grain size of a prior-austenite is 8.0 μm or less, and{'sup': '−2', 'wherein a number density of a void having a circle equivalent diameter of 0.02 μm to 3.0 μm is 2000 mmor less in the metallographic structure.'}2. The bearing part according to comprising claim 1 , as the chemical composition claim 1 , by mass % claim 1 , one or more ofMo: 0.01% to 0.25%,B: 0.0001% to 0.0050%,Cu: 0.1% to 1.0%,Ni: 0.05% to 3.0%, andCa: 0.0003% to 0.0015%.3. The bearing part according to claim 1 ,wherein a Vickers hardness is 750 Hv or more, and{'sup': '6', 'wherein a rolling contact fatigue life in a contaminated environment ...
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