【摘要】 铁基粉末冶金含油减摩材料的显微组织为珠光体、渗碳体和游离石墨。随石墨含量增加 ,显微组织由细片状珠光体向较粗片状珠光体过渡 ,晶粒长大 ,并出现网状渗碳体和针状渗碳体 ,孔隙球化。机械性能的变化趋势是 :密度增加 ,含油率下降 ,布氏硬度增加 ,而压溃强度先降低后增加。碳含量从 1.5 % ,2 .0 %变化到 2 .5 %时 ,摩擦因数略微降低 ,磨损率几乎呈直线下降。研究结果表明 ,石墨含量为 1.5 %和 2 .0 %时组织和综合性能较好更多还原

【Abstract】 The micro structure of iron based P/M oil impregnating antifrication materials includes pearlite, cementite and free graphite .With the increase of graphite content, the micro-structure transits from fine flake pearlite to coarser one and crystal grains become larger ,and network cemenite and acicular cementite appear and pores nodularization as well. Development tendency of mechanical properties is :density increase oil content ratio decreases ,Brinall hardness increases,crushing strength goes down first and then goes up .when carbon content varies from 1.5%,2.0%to2.5%,the friction factor falls slightly ,whereas the wear rate decreases dramatically,Research results show that the micro structure and comprehensive properties are better when graphite content is 1.5% and 2.0%.更多还原