不同孕育剂处理的高强度灰铸铁加工性能研究  

Study on Machinability of High Strength Gray Cast Iron Using Different Inoculants

作　　者：黄胜操[1] 任凤章[1] 李锋军[2] 张旦闻[3] 孙娟[3] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003 [2]中国一拖集团有限公司,河南洛阳471004 [3]洛阳理工学院机电工程系,河南洛阳471023

出　　处：《铸造》2012年第6期598-603,共6页Foundry

基　　金：河南省科技创新人才计划项目(104100510005);河南省高校科技创新人才支持计划项目(2009HASTIT023);洛阳市应用技术研究与开发基金项目(0901011A)

摘　　要：为研究不同孕育剂对灰铸铁切削加工性能的影响,制备了高强度HT350材质的试样。对比研究了孕育剂75SiFe、SrSi、BaSi、SiS(r80%)+75FeS(i20%)处理的高强度灰铸铁的力学性能和切削加工性能。结果表明,SiS(r80%)+75FeS(i20%)复合孕育处理的灰铸铁较单一孕育处理的灰铸铁石墨细小弯曲,基体组织均匀性好,具有较高的硬度以及较小的切削抗力,但其断面敏感性较大。单一孕育剂中75SiFe孕育处理的灰铸铁具有较高的抗拉强度、较小的硬度以及较低的断面敏感性。灰铸铁中A型石墨越细小,基体组织越均匀,灰铸铁的加工性能越好,说明显微组织的均匀性对灰铸铁的加工性能具有较大影响。The high strength test samples of gray cast iron HT350 was prepared by adding different inoculants.The mechanical property and machinability of high strength gray cast iron with various inoculants including 75SiFe,SrSi,BaSi,and SiSr（80%）＋ 75FeSi（20%）were investigated.The results show that the gray iron with the compound inoculation containing 80wt.% SiSr and 20wt.% 75FeSi had smaller graphite morphologies,more homogeneous microstructure,higher hardness,and lower cutting resistance than those inoculated by a single inoculants,but had larger section sensitivity.Compared with other single inoculant,the gray cast iron inoculated by single 75FeSi had higher tensile strength,smaller hardness and lower section sensitivity.The smaller graphite morphologies and the more homogeneous microstructure in gray cast iron,the better machinability gray cast iron has,which shows the homogeneousness of the microstructure of the gray cast iron has great effect on the machinability.

关 键 词：高强度灰铸铁 孕育处理 切削加工性能 

分 类 号：TG251.13[金属学及工艺—铸造]