稀土蠕化剂对蠕墨铸铁石墨形态和性能的影响.pdfVIP

学兔兔 铸 造 Apr．2010 · 400· FOUNDRY Vo1．59 NO。4 稀土蠕化剂对蠕墨铸铁石墨形态和性能的影响 朱 刚 ，蒋业华 ，刘星舟 --，黎振华 (1．昆明理工大学材料科学与工程学院，云南昆明650093；2．云内动力股份有限公司，云南昆明650224) 摘要：对以云南地方生铁为主要炉料的铁液，搭配使用稀土硅铁合金和稀土镁合金作为蠕化剂，研究了稀土蠕化剂加 入量对蠕墨铸铁石墨形态和性能的影响。研究结果表明，随着稀土蠕化剂加入量的增加，铁液中稀土残留量逐渐增加， 石墨形态从片状逐渐向球状过渡，抗拉强度和硬度逐渐上升。实践证明，通过合适的蠕化处理工艺，云南地方生铁铁 液可以获得组织和性能较为理想的蠕墨铸铁。 关键词：云南地方生铁；蠕墨铸铁；稀土蠕化剂；石墨形态；性能 中图分类号：TG143．49 文献标识码：A 文章编号：1001—4977(2010)04—0400—04 Effect Of Rare Earth Vermicular Agent On Graphite Morphology and Property of Compacted Graphite Cast lrOn ZHU Gang’．JIANG Ye—hua’．LIU Xing—zhou1，2 LI Zhen．hua (1．School of Materials Science and Engineering，Kunming University of Science and Technology，Kunming 650093 Yunnan，China；2．Kunming Yunnei Power Co．，Ltd．， Kunming 650224，Yunnan，China) Abstract：The compacted graphite cast iron was fabricated by using of Yunnan local pig iron as the main furnace charge．and the RE—ferro—silion alloy and RE—magnesium alloy as vermicular agent。 respectively．The effect of the addition amount of vermicular agents on the graphite morphology and property of compacted graphite cast iron was investigated．Results jndicate that the residual rare earth content increased and the graphite morphology gradually transferred frOm flake to spherical shape with increasing of the amount of vermicular agents，and the tensile strength and hardness increased．Results of practice indicate that using Yunnan IocaI pig iron as base iron can get compacted graphite cast iron which possesses more ideal micrOstructu