(1. 上海大学 省部共建高品质特殊钢冶金与制备国家重点实验室，上海 200072；
2. 上海大学 上海市现代冶金与材料制备重点实验室，上海 200072；
3. 上海大学 材料科学与工程学院，上海 200072)
摘 要: 在高强钢热浸镀铝硅合金中，通常会有一定量Mn溶解到镀液中，对镀层凝固组织产生影响。本文研究了热浸镀用Al-10Si-2Fe合金中Mn元素对凝固组织及富铁相的影响规律。结果显示，随着Mn含量的增加，铝硅合金中富铁相形貌转变过程如下：针状→汉字状→星状→多边形。借助Pandat软件在热力学层面解释了Mn添加后铝硅合金中β-Al9Fe2Si2相向α-Al8(Fe,Mn)2Si相转变的原因。此外，给出了添加Mn后的渣量计算结果，认为铝硅熔液中最佳Mn含量(质量分数)应为0.8%~1.0%。
关键字: 铝硅镀层，富铁相，渣量
（1. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai, 200072, China;
2. Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai University, Shanghai 200072, China;
3. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China）
Abstract:During hot-dip Al-Si alloy coating process, there will be a certain amount of Mn dissolved into the bath, which affects the solidification microstructure of the coating. In this paper, the influence of Mn addition on solidification structure and iron-rich phase in Al-10Si-2Fe alloy for hot-dip coating was studied. The results show that with the increasing of Mn, the transformation sequence of iron-rich phase in aluminum silicon alloy is as follows: needle-like→Chinese-script→star-like→polygon. The thermodynamically reasons for the transformation of β-Al9Fe2Si2 phase to α-Al8(Fe, Mn)2Si phase in Al-Si alloy after Mn addition were explained by means of Pandat software. Moreover, the variation of slag content with Mn addition was also calculated, which shows that the optimal Mn content in Al-Si melt should be 0.8%-1.0%.
Key words: hot-dip; Al-10Si-2Fe coating; iron-rich phase, dross amount
