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BEARING MEMBER EXCELLENT IN CHARACTERISTIC OF RETARDING MICROSTRUCTURAL CHANGE DUE TO REPEATED STRESS LOAD AS WELL AS HEAT TREATMENT PRODUCTIVITY
BEARING MEMBER EXCELLENT IN CHARACTERISTIC OF RETARDING MICROSTRUCTURAL CHANGE DUE TO REPEATED STRESS LOAD AS WELL AS HEAT TREATMENT PRODUCTIVITY
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机译:轴承具有出色的特点,可消除由于重复应力负荷和热处理生产率而导致的微结构变化
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PURPOSE: T provide a bearing member, in which heat treatment decarburized layer is inhibited and rolling fatigue life is improved, by specifying the chemical composition of a steel material and controlling the amount of retained austenite in a structure. ;CONSTITUTION: This steel material consists of, by weight, 0.5-1.5% C, 1.0-3.0% Ni, 0.001-0.015% Sb, ≤0.0020% O, and the balance Fe with inevitable impurities and can further contain one or =2 kinds selected from 0.05-0.5% Si, 0.05-2.0% Mn, 0.05-2.5% Cr, 0.05-0.5% Mo, 0.05-1.0% Cu, 0.0005-0.01% B, 0.005-0.07% Al, and 0.0005-0.01% N. Moreover, a steel structure in which the amount of retained austenite in the steel is regulated, by volume ratio, to 10-35% is formed. By this method, heat treatment decarburized layer can be inhibited by the effect of Sb addition and a microstructural change due to repeated stress load in a bearing member can be retarded by the effects of the combined addition of Ni and Sb and the retained austenite, and rolling fatigue life can be improved.;COPYRIGHT: (C)1995,JPO
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