热浸渗铝球墨铸铁合金层组织的演变规律  

Microstructure evolution of intermetallic layer of hot dip aluminized ductile cast iron

作　　者：陈江[1] 赵君文[1] 黄兴民[1] 程乾[1] 韩靖[1] 张鲲[1] 戴光泽[1] 

机构地区：[1]西南交通大学材料科学与工程学院,成都610031

出　　处：《中国有色金属学报》2013年第5期1248-1254,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家"十一五"科技支撑计划资助项目(2009BAG12A07);国家自然科学基金资助项目(51201144);中央高校基本科研业务费专项资金资助项目(2682013CX003;SWJTU12CX011;SWJTU12CX012;SWJTU11CX051)

摘　　要：为了探索热浸渗铝球墨铸铁合金层的组织演变规律以及基体中Ni含量对渗铝合金层组织的影响,利用激光共聚焦显微镜(LCM)、场发射扫描电子显微镜(FESEM)以及能谱仪(EDS)对不同渗铝时间制备的球墨铸铁渗铝试样以及不同Ni含量的球墨铸铁渗铝试样的合金层组织进行观察和定量分析。结果表明:在本实验条件下,热浸渗铝球墨铸铁合金层组织由厚度较大的"舌状"Fe2Al5和厚度很小的FeAl3组成,合金层和表面纯铝层中存在石墨球分布;在0-15 min内,渗铝试样合金层经过短暂的过渡阶段后随渗铝时间的延长按抛物线规律扩散生长,15 min后合金层厚度达65μm以上;基体Ni含量由0增加至1.5%(质量分数)后,合金层厚度由88μm减小至49μm,合金层与基体的"舌状"界面程度变小。此外,对热浸渗铝球墨铸铁合金层组织演变机理进行了探讨。To study the microstructure evolution of intermetallic layer of hot dip aluminized ductile cast iron and the effect of Ni content on the microstructure of the intermetallic layer, laser confocal microscope （LCM）, field emission scanning electron microscope （FESEM） and X-ray energy dispersive spectrometer （EDS） were used to carry out the microstructure observation and quantitative analysis of the intermetallic layer of hot dip aluminized ductile cast iron with different hot-dip times as well as specimens with different Ni contents. The results show that the intermetallic layer consists of a ＂tongue-shape＂ Fe2AI5 layer and a FeAI3 layer of which the thickness is much thinner than that of the former. At the same time, graphite spheroids disperse in the outer A1 topcoat and the inner Fe-A1 intermetallic layer; within 0-15 rain, the growth rate of the intermetallic layer approximately obeys the parabolic rate law after a short transition phase, and the layer is thicker than 65μm after 15 rain. Furthermore, the thickness of the intermetallic layer decreases from 88 to 49 μm with the increase of Ni content from 0 to 1.5% substrate and Fe2A15 phase becomes smooth. In addition, aluminized ductile cast iron was also discussed. （mass fraction）, and the ＂tongue-shape＂ interface between the the microstructure evolution of intermetallic layer of hot dip

关 键 词：球墨铸铁 热浸渗铝 组织演变 Ni含量 

分 类 号：TG174.443[金属学及工艺—金属表面处理]