Sr对高铬铸铁变质作用的研究
Study on Modification Effect of Sr on High-chromium Cast Iron
柳 青1, 杨 华1, 丁海民2, 张 甜1
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作者单位：(1. 山东大学 材料科学与工程学院, 山东 济南 250061; 2. 华北电力大学 机械系, 河北 保定 071003)
中文关键字：高铬铸铁； 变质处理； Al-Sr； 萃取
英文关键字：high chromium cast iron; modification; Al-Sr; extraction
中文摘要：研究了Sr对高铬铸铁的变质作用。结果表明，向高铬铸铁中加入微量Sr可有效改善高铬铸铁的铸态组织，使碳化物变的细小均匀。变质后高铬铸铁中的碳化物形貌发生显著变化，共晶碳化物由原来粗大的板片状转变为细小的圆杆状或圆管状，并且其横截面直径大部分在亚微米级。这些细小的碳化物在基体上均匀分布，而且碳化物与基体组成的共晶团得到明显细化；但是过量Sr会使变质效果急剧衰退，这表明Sr的变质效果存在明显的过变质现象。
英文摘要：The modification effect of Sr on microstructure of high-chromium cast iron (HCCI) was studied. The results demonstrate that the microstructure of the HCCIs can be effectively modified after the addition of a small amount of Sr. The carbides can be modified to smaller ones and homogeneous distribution. After modification, the large sized lath-like carbides change into slender rods and/or tubes, and these rods and/or tubes are in submicron size. These carbides distribute homogeneously in the matrix, and the dimension of the eutectic cells dismisses. However, the modification effect declines drastically when a larger amount of Sr are added, that is to say, an obvious over-modification exists in the modification process.