【摘要】 在高锰耐磨钢成分基础上引入石墨,通过熔炼法制备出新型高耐磨Fe-Mn-C-Si固体自润滑合金.研究了Si含量对凝固组织的影响;通过金相显微镜、SEM、XRD、EDS、以及干摩擦磨损试验主要分析了合金的组织形态、物相、干摩擦磨损特性.结果表明,合金由奥氏体、Fe2.7Mn0.3C及带分枝的片状石墨组成.随Si含量的增加,Fe2.7Mn0.3C不断减少并细化,而石墨不断增加.当Si含量达4%时,合金具有明显的石墨化效果.与QT500-7球墨铸铁相比,合金的摩擦系数μ和磨损率W均大大降低,当成分为79.5%Fe、13%Mn、3.5%C、4%Si时,合金的摩擦系数μ为球墨铸铁的1/2以下,而磨损率W仅约为球墨铸铁的1/19.更多还原

【Abstract】 A new Fe-Mn-C-Si solid self-lubricating alloy with high wear resistance was designed and was prepared by melting method.This alloy is on the base of chemical composition of high manganese steel by adding carbon to form graphite in the matrix.The effect of Si content to freezing microstructure was studied.The microstructure and phases of the alloy were analyzed by optical microscope、 SEM、 XRD and EDS respectively.The tribological behaviour of the alloy was evaluated by dry wear test.The results indicated that the microstructure of the alloy was composed of austenite、 Fe2.7Mn0.3C and flaky graphite.The amount of the Fe2.7Mn0.3C gradually decreased and fined as the content of silicon increased,however,the amount of graphite gradually increased.When the content of silicon was 4%,the process of graphite forming is evident compared with the QT500-7 ductile cast iron,the friction coefficient and wearing rate of the alloy reduce greatly.When the composition of the alloy is 79.5%Fe、 13%Mn、 3.5%C and 4%Si,the friction coefficient of the alloy is below 1/2 less than the one in the ductile cast iron,and the wearing rate is only about 1/19 of the one in the ductile cast iron.更多还原