【摘要】 介绍了铸态高强度、高韧性球墨铸铁QT800-5悬挂支架的研制情况,主要技术措施是:(1)选用高C、低P、低S的优质球铁生铁;(2)加入少量的Cu、Mo、Sb等合金元素进行复合强化;(3)球化剂选用Fe Si Mg8RE3,包内孕育剂选用75Si Fe,二次孕育及随流孕育采用自行配制复合孕育剂;(4)球铁原铁液的化学成分控制为:w(C)3.6%~3.8%,w(Si)2.5%~2.8%,w(Mn)0.25%~0.45%,w(S)<0.02%,w(P)<0.03%,w(Cu)0.2%~0.4%,w(Mo)0.1%~0.3%,w(Sb)0.01%~0.02%。试验结果表明:珠光体体积分数超过95%,含有少量铁素体,石墨球化良好,石墨球细小且均匀,力学性能检测数据符合技术要求。更多还原

【Abstract】 The development of casting high strength and toughness QT800-5 nodular iron suspension bracket was introduced.The main technical measures were as follows:(1)Good quality nodular iron with high C,low P and low S was used.(2)A small amount of Cu,Mo,Sb and other alloying elements were added as strengthen compound.(3)Fe Si Mg8RE3 was used as the nodularizing agent,75 Si Fe was the inoculant in ladle,and self-prepared compound inoculant were using in secondary inoculation and concomitant with the flow inoculation.(4)The chemical composition of nodular iron liquid was controlled as w(C)3.6%~3.8%,w(Si)2.5%~2.8%,w(Mn)0.25%~0.45%,w(S)<0.02%,w(P)<0.03%,w(Cu)0.2%~0.4%,w(Mo)0.1%~0.3%,w(Sb)0.01%~0.02%. The results shown that the volume fraction of pearlite was more than 95%. The structure contained a small amount of ferrite. Good nodularized graphite were small and well distributed. Testing data of mechanical properties meet the technical requirements.更多还原