锡对蠕墨铸铁显微组织和力学性能的影响  

Effect of Sn on Microstructure and Mechanical Properties of Vermicular Graphite Iron

作　　者：赵靖宇[1] 吕烨哲[1,2] 孙玉福[1] 王谦谦[1] 司光东[1] 吴越[1] 丁丽平[1] 李路[1] 

机构地区：[1]郑州大学材料科学与工程学院,河南郑州450002 [2]瑞典皇家理工学院材料科学与工程系,瑞典斯德哥尔摩se10044

出　　处：《铸造》2013年第10期948-952,共5页Foundry

摘　　要：通过OM、SEM观察、EDS分析和拉伸性能测试,研究了锡对蠕墨铸铁显微组织和力学性能的影响规律。结果表明:锡使石墨减少并细化,同时稳定并细化珠光体;含锡量为0.057%时,珠光体含量达95%,层片间距由不含锡时的320 nm减小为83 nm,为屈氏体型珠光体,且珠光体团数量明显增加;含锡量增加到0.121%时组织中出现了游离渗碳体。加入适量的锡有助于蠕墨铸铁拉伸性能的提高,含锡0.057%试样的抗拉强度达410.7 MPa,伸长率为1.23%;含锡量超过0.121%之后,蠕墨铸铁的抗拉强度和伸长率迅速恶化。Effect of Sn on microstructure and mechanical properties of vermicular graphite iron （VG1） was investigated by testing with OM, SEM, EDS and tensile properties experiments. The results show that Sn abates the amount of vermicular graphite and refines them. Pearlite is promoted and refined by addition of Sn. With addition of 0.057% Sn, pearlite accounts for more than 95% and the lamellar spacing apparently narrows to troostite level （83 nm）. Appropriate addition of Sn helps to strengthen the VGI and samples containing 0.057% Sn performs the best tensile strength of 410.7 MPa and a decent elongation of 1.23%. However, excessive Sn （more than 0.121%） promotes the generation of free cementite, which fatally decrease the strength and ductility of VGI.

关 键 词：蠕墨铸铁 锡 显微组织 珠光体 力学性能 

分 类 号：TG143.49[一般工业技术—材料科学与工程]