制动鼓用含锡蠕墨铸铁的冲击韧性  

Impact Toughness of Compacted Graphite Iron Containing Sn Used for Brake Drums

作　　者：赵靖宇[1] 吕烨哲[1,2] 孙玉福[1] 司光东[1] 吴越[1] 

机构地区：[1]郑州大学材料科学与工程学院,郑州450002 [2]瑞典皇家理工学院机械设计系,斯德哥尔摩se10044

出　　处：《机械工程材料》2015年第3期80-83,93,共5页Materials For Mechanical Engineering

摘　　要：研究了不同锡含量蠕墨铸铁的冲击韧性及冲击断口形貌。结果表明:锡主要以固溶的形式均匀分布在基体组织中,在石墨中的分布相对较少;随着锡含量增多,蠕墨铸铁的冲击韧性先增大后减小,锡质量分数为0.057%时,冲击功最高,为9.11J;锡质量分数为0.003%和0.121%蠕墨铸铁的冲击断口为典型的解理断裂,断口上存在扇形河流花样,游离渗碳体和粗大的蠕虫状石墨易成为裂纹源;锡质量分数为0.028%和0.057%蠕墨铸铁的冲击断口上无解理面,为准解理断裂;适量的锡可提高蠕墨铸铁的冲击韧性,但过量后会使冲击韧性迅速恶化。The impact toughness and impact fracture morphology of compacted graphite iron（CGI）containing Sn were investigated.The results show that Sn mainly solidly dissolved uniformly in the matrix but distributed less in the graphite.With the increase of Sn content,the impact toughness of CGI firstly increased and then decreased,and when the mass fraction of Sn was 0.057%,the impact energy was the highest,up to 9.11 J.The impact fracture of the CGIs containing 0.003% Sn and 0.121% Sn showed typical cleavage fractures and river patterns.Free cementite and bulk vermicular graphite were supposed to be the initial origins of cracks.Fracture of the CGIs containing 0.028% Sn and 0.057% Sn exhibited quasi-cleavage patterns and no cleavage facets were found.Appropriate Sn content helps to increase the impact toughness of CGI but excessive Sn speedily damages the impact toughness.

关 键 词：蠕墨铸铁 锡 元素分布 冲击韧性 

分 类 号：TG143.49[一般工业技术—材料科学与工程]