球化合金和孕育方法对GhMoRct球墨铸铁组织及性能的影响.pdfVIP

学兔兔 Feb。2010 铸 造 VOI．59 NO．2 FOUNDRY ·149· 球化合金和孕育方法对GhMoRct球墨铸铁组织 及性能的影响 程武超 ，赵新武 ，党波涛 ，白广跃 (1．西峡县内燃机进排气管有限责任公司，河南西峡474500；2．沈阳鸿本机械有限公司，辽宁沈阳110027) 摘要：采用两种不同的球化合金对GHMoRct球墨铸铁进行球化处理，合理配制炉料，用长效复合孕育剂随流孕育； 运用均衡凝固技术，调整合适的CE，利用石墨化膨胀产生的自补缩效果消除显微缩松，生产出了基体组织和力学性能 都符合技术要求的产品。 关键词：球墨铸铁；球化合金；孕育；碳当量；铸态珠光体；显微缩松；力学性能 中图分类号：TG255 文献标识码：B 文章编号：1001—4977(2010)02—0149—05 Effect of Inoculant Alloy and Inoculation Method on Structure and Properties GhMoRct Ductile Cast Iron CHENG Wu—chao’，ZHAO Xin—WU’，DANG Bo-tao ，BAI Guang-yue (1．Xixia Intake＆Exhaust Manifold Co．，Ltd．，Xixia 474500，He’nan，China； 2．Shenyang Honbase Machinery C0．，Ltd．，Shenyang 1 1 0027，Liaoning，China) Abstract：Tw0 different kinds of inoculant alloy were used to spheroidize GHMoRct(QTRSi4Mo1) ductile iron．and the reasonable furnace charge as well as metal—stream inoculation with long-acting compound inoculant were employed．By means of equilibrium solidification technology，appropriate CE was obtained．and SO the microscopic porosity can be eliminated by self-feeding effect produced by graphitizing expansion．Finally the qualified products。whose matrix structure and mechanicaI properties meet the specification，were gained． Key WOrds：ductile iron：inoculant alloy；inoculation；carbon equivalent；as-cast pearlite；microshrink- age；mechanical properties 随着发动机技术的进步，GHMoRct(QTRSi4Mo1) 表1硅钼球墨铸铁化学成分 (以下简称中硅钼)球墨铸铁以其优越的高温力学性 Table 1 Chemical composition of SiMo ductile cast iron ， 能、高温稳定性能和抗氧化性能被广泛的用于高热负 荷柴油发动机排气歧管的制造。中硅钼球墨铸铁已成 为国际上排气歧管的首选材料。西峡县内燃机进排气 注：QTRSi