利用光学显微镜(OM)和扫描电子显微镜(SEM),对GCr15轴承钢贝氏体-马氏体(B-M)复相淬火进行的研究.分析了等温淬火温度和保温时间、奥氏体晶粒尺寸、球化组织中渗碳体颗粒的单位体积密度对B-M复相淬火的影响规律.结果表明:等温淬火保温时间为30 min时,270℃淬火有利于下贝氏体的转变;等温淬火温度为240℃时,保温60 min有利于下贝氏体的转变.当渗碳体单位体积密度达到3.45个时,贝氏体铁素体片条变细,试验钢硬度升高.
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