稀土与镁含量对蠕墨铸铁凝固过程及石墨形态的影响  

Effect of Rare Earth and Magnesium Contents on the Solidification Process and Graphite Morphology of Compacted Graphite Cast Iron

作　　者：郝博魁 邓小洲 蔡启舟[2] 肖凤赞 郑卫星 田韵森 陈哲[2] HAO Bokui;DENG Xiaozhou;CAI Qizhou;XIAO Fengzan;ZHENG Weixing;TIAN Yunsen;CHEN Zhe(Yichang Marine Diesel Engine Co.,Ltd.,Yichang 443002,China;State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]宜昌船舶柴油机有限公司,湖北宜昌443002 [2]华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074

出　　处：《铸造技术》2022年第1期14-18,共5页Foundry Technology

基　　金：中国船舶重工集团柴油机有限公司技术创新项目(CXC-022-2020)。

摘　　要：采用热分析技术和微观组织分析,研究了蠕化元素RE和Mg含量对蠕墨铸铁凝固过程和石墨形态的影响。结果表明,铁液经RE与Mg蠕化处理后,共晶点右移,初晶温度升高,0.019%~0.023%RE和0.006%~0.011%Mg使初晶温度由原铁液的1152.7℃上升至1163.2~1166.6℃。共晶凝固再辉温度ΔT_(R)与石墨形态具有确定的对应关系,随着ΔT_(R)增加,蠕化率升高,当再辉温度高于5℃,蠕化率大于50%。提高RE/Mg比,有利于获得高蠕化率,RE/Mg比增加后,采用高效孕育剂,可抑制蠕化铁液的白口倾向。The effect of vermicular element RE and Mg content on the solidification process and morphology of vermicular graphite was studied by thermal analysis and microstructure characterization.The results show that the eutectic point moves to right and the primary crystallization temperature increases after vermicularization treatment by Re and Mg alloy,and 0.019%~0.023%RE and 0.006%~0.011%Mg increase the primary crystallization temperature from 1152.7℃to 1163.2~1166.6℃.There is a definite relationship between the eutectic recalescence temperatureΔT_(R)and morphology of graphite.With the increase ofΔT_(R),the vermicular rate increases.When recalescence temperature is higher than 5℃,the vermicular rate is more than 50%.In crease Re/Mg ratio is beneficial to obtain high vermicular rate,and the chill tendency can be inhibited by using high efficiency inoculants when RE/Mg ratio is increased.

关 键 词：蠕墨铸铁 冷却曲线 凝固过程 共晶再辉 石墨形态 

分 类 号：TG143.49[一般工业技术—材料科学与工程] TG244[金属学及工艺—金属材料]