Sb-Ba复合随流孕育对大断面球铁低温冲击性能的影响  

Effect of compound stream inoculations with Sb and Ba on low temperature impact properties of heavy section ductile iron

作　　者：李蒙[1] 于亚征 孟银娜 祝庆 LI Meng;YU Yazheng;MENG Yinna;ZHU Qing;无(College of Artificial Intelligence,Jiaozuo University,Jiaozuo 454000,Henan,China;College of Mechanical and Electrical Engineering,Jiaozuo University,Jiaozuo 454000,Henan,China;Henan Mechanical and Electrical Vocational College,Zhengzhou 451191,Henan,China;Department of Production,Shangqiu Sunshine Aluminum Co.,Ltd.,Shangqiu 476000,Henan,China)

机构地区：[1]焦作大学人工智能学院,河南焦作454000 [2]焦作大学机电工程学院,河南焦作454000 [3]河南机电职业学院,河南郑州451191 [4]商丘阳光铝材有限公司生产部,河南商丘476000

出　　处：《钢铁研究学报》2022年第2期175-180,共6页Journal of Iron and Steel Research

基　　金：河南省科技攻关计划资助项目(162102210352)。

摘　　要：采用随流孕育的方式向铁液中分别加入普通孕育剂75SiFe和含Sb和Ba孕育剂进行孕育处理,浇注尺寸规格为180 mm×180 mm×200 mm的大断面球墨铸铁试块。运用光学显微镜(OM)、扫描电子显微镜(SEM)、拉力试验机、冲击试验机等检测方法,研究Sb-Ba复合随流孕育对大断面低温球墨铸铁组织和性能的影响。结果表明,与用普通孕育剂75SiFe相比,运用含Sb和Ba复合孕育剂对铁液进行随流孕育能显著改善大断面低温球墨铸铁微观组织和力学性能。该工艺可提高试样的石墨球化级别、改善石墨形态、增加石墨球数量、细化石墨球,可有效避免孕育衰退,使铸件组织和力学性能达到较佳匹配。冲击试验表明,低温韧性得到了明显提高,其(-40℃)冲击功平均值不低于为12 J。The conventional inoculant 75 SiFe and compound inoculant containing Sb and Ba were added into the molten iron by stream inoculations, and the heavy section ductile iron test block with size of 180 mm×180 mm×200 mm was poured. The microstructure and mechanical properties of heavy section low-temperature ductile cast iron treated with Sb-Ba compound stream inoculation were investigated by means of optical microscope(OM), scanning electron microscope(SEM), tensile testing machine and impact testing machine. The results show that, compared with 75 SiFe inoculants, the microstructure and mechanical properties of low-temperature ductile iron with heavy section can be significantly improved by using the instant stream inoculation treatment with compound inoculants containing Sb and Ba. This process can improve the graphite spheroidization grade, improve the graphite morphology, increase amount of graphite nodule, reduce diameter of graphite nodule, effectively avoid inoculation fading, and the microstructure and mechanical properties of the castings can be well matched. The impact test shows that the low-temperature toughness is obviously improved, whose average impact toughness at-40 ℃ is not less than 12 J.

关 键 词：Sb-Ba复合孕育 随流孕育 大断面球铁 显微组织 低温冲击性能 

分 类 号：TG143.5[一般工业技术—材料科学与工程]