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.
出处
《铸造》
CAS
CSCD
北大核心
2013年第10期948-952,共5页
Foundry
关键词
蠕墨铸铁
锡
显微组织
珠光体
力学性能
vermicular graphite iron
Sn
microstructure
pearlite
mechanical properties
