包芯线种类及芯料镁含量对球墨铸铁组织及性能的影响  

Effects of Types and Magnesium Content of Nodularizing Cored Wire on Microstructure and Properties of Ductile Iron

作　　者：齐朋展 徐锦锋[1] 闫启栋 李建锋 QI Peng-zhan;XU Jin-feng;YAN Qi-dong;LI Jian-feng(School of Materials Science and Engineering,Xi'an University of Technology,Xi'an 710048,Shaanxi,China;Yuzhou Henglilai Alloy Co.,Ltd.,Yuzhou 461670,Henan,China)

机构地区：[1]西安理工大学材料学院,陕西西安710048 [2]禹州市恒利来合金有限责任公司,河南禹州461670

出　　处：《铸造》2020年第8期822-827,共6页Foundry

摘　　要：采用喂丝球化/孕育技术对原铁液进行球化和孕育处理,研究了包芯线种类和镁含量对QT450-10球铁中镁的吸收率、微观组织和力学性能的影响规律。结果表明:在其他工艺因素和镁含量确定的条件下,用合金料芯球化包芯线处理的铁液中镁的吸收率略高于混合料芯球化包芯线,相对高出量在0.2%~8.2%。用两种球化包芯线处理的铁液球化率均在85%以上,石墨大小6~7级,但混合料芯球化包芯线对应的铁液球化率偏低、球数偏多、球径偏小。随着镁含量的增大,两种球化包芯线对应的镁的吸收率、球化率和球数均呈下降趋势,而平均球径趋于增大。用混合料芯球化包芯线制备的球铁的强度和硬度均较高,而塑韧性指标明显低于合金料芯球化包芯线。当芯料中镁含量为15%时,用两种球化包芯线均可获得微观组织和常规力学性能合格的QT450-10球铁材质。In this experiment,the molten iron was treated with the wire feeding nodularization and inoculation technology.The effects of type and magnesium content of nodularizing cored wire on the Mg absorptivity,microstructure and mechanical properties of QT450-10 ductile iron were studied.The results show that the Mg absorptivity in the molten iron treated with nodularizing alloy-cored wire is slightly higher about 0.2%-8.2%relative ratio than that of the nodularizing mixture-cored wire at fixed magnesium content and conditions of other process factors,.The nodularity of the molten iron treated with two types of nodularizing cored wire is above 85%,and the graphite size is 6 to 7 grade.Comparatively,the nodularity and graphite sphere diameter of the alloy treated with nodularizing mixture-cored wire are slightly lower than those of the alloy treated with nodularizing alloy-cored wire,while the counts of graphite sphere tend to increase lightly.With an increase in magnesium content in nodularizing cored wire,the Mg absorptivity of molten iron treated with two types of nodularizing cored wires decreases,the nodularity and the counts of graphite sphere tend to decrease,while the average diameter of graphite sphere tends to increase.The strength and hardness of ductile iron treated with nodularizing mixture-cored wires are higher than those of the ductile iron treated with nodularizing alloy-cored wire,but the plasticity and toughness are obviously lower.When the content of magnesium in the nodularizing cored wire is 15%,the desired microstructure and mechanical properties of QT450-10 ductile iron can be obtained by using two types of nodularizing cored wire.

关 键 词：喂丝球化 球化包芯线 芯料含镁量 镁吸收率 球化率 力学性能 

分 类 号：TG255[金属学及工艺—铸造]