蠕化剂加入量对蠕墨铸铁组织和性能的影响  

Effect of Vermiculizer Amount on Microstucture and Properties of Vermicular Graphite Cast Iron

作　　者：吴奎武[1] 司乃潮[1] 刘光磊[1] 张佳琦[1] 孙浩 陈辉辉 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]常柴股份有限公司铸造厂,江苏常州213000

出　　处：《稀土》2016年第4期67-73,共7页Chinese Rare Earths

摘　　要：以3M78缸体为研究对象,使用自制蠕化剂,通过金相观察和力学性能测试,系统研究了不同蠕化剂加入量对蠕墨铸铁的石墨形态、力学性能和壁厚敏感性的影响。实验结果表明,随着蠕化剂加入量的增加,石墨发生由片状向蠕虫状再向球状形态的转变,力学性能逐渐提高。铸件蠕化效果受壁厚敏感性影响显著,壁厚较薄处蠕化率相对较低。对于3M78缸体,蠕化剂最佳加入范围为0.325%-0.335%,加入量为0.33%时,壁厚为5 mm、12 mm、27 mm部位处的蠕化率分别高达65%、80%、85%。研究结果为蠕墨铸铁发动机缸体的稳定生产提供技术参考。The 3M78 cylinder was the research object in this study. By using homemade vermiculizer, effect of different vermieulizer amount on graphite morphology, mechanical properties and wall thickness sensitivity of vermicular graphite cast i- ron was studied by metallographic observation and mechanical tests. The results show that with vermiculizer amount increas- ing, the graphite morphology gradually transferred from flake graphite to vermicular graphite, then to spheroidal graphite, and the mechanical properties increased gradually. In addition, the effect of vermiculizer was significantly affected by the wall thickness sensitivity. The vermicularity of thin wall thickness is relatively low. For 3M78 cylinder, adding 0. 325% - 335% of the vermiculizer is the optimal range, and the vermicularity of adding 0. 33% of vermiculizer is 65% , 80% and 85% for three kinds of different wall thickness. The research results provide reference for the stable production of engine cylinder.

关 键 词：蠕墨铸铁 蠕化剂 壁厚敏感性 显微组织 力学性能 

分 类 号：TG25[金属学及工艺—铸造]