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HEAT TREATMENT METHOD, AND, METHOD FOR MANUFACTURING BEARING RACE RING
HEAT TREATMENT METHOD, AND, METHOD FOR MANUFACTURING BEARING RACE RING
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机译:热处理方法以及制造轴承环的方法
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摘要
PROBLEM TO BE SOLVED: To provide a heat treatment method that can provide a heat-treated workpiece having a high hardness in the surface layer portion and a low hardness in the inside layer portion compared to the surface layer portion in a short period of time without carrying out carburization.;SOLUTION: The heat treatment method applied to a workpiece made of carbon steel or alloy steel is provided that comprises a heating step (A) of heating the workpiece to a temperature of austenitizing temperature or higher and a cooling step (B) of cooling the workpiece by ejecting a cooling medium to the heated workpiece. In the step (B), the condition of ejecting the cooling medium is varied with time to obtain a heat-treated workpiece having a surface layer portion composed of martensite and an inside layer portion surrounded peripherally by the surface layer portion and including perlite and/or bainite at least partly.;SELECTED DRAWING: Figure 3;COPYRIGHT: (C)2018,JPO&INPIT
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