Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第5期    总第170期    2013年5月

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文章编号:1004-0609(2013)05-1248-07
热浸渗铝球墨铸铁合金层组织的演变规律
陈 江,赵君文,黄兴民,程 乾,韩 靖,张 鲲,戴光泽

(西南交通大学 材料科学与工程学院,成都 610031)

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65 μm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88 μm减小至49 μm,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。

 

关键字: 球墨铸铁;热浸渗铝;组织演变;Ni含量

Microstructure evolution of intermetallic layer of hot dip aluminized ductile cast iron
CHEN Jiang, ZHAO Jun-wen, HUANG Xing-min, CHENG Qian, HAN Jing, ZHANG Kun, DAI Guang-ze

School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China

Abstract: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” Fe2Al5 layer and a FeAl3 layer of which the thickness is much thinner than that of the former. At the same time, graphite spheroids disperse in the outer Al topcoat and the inner Fe-Al intermetallic layer; within 0-15 min, the growth rate of the intermetallic layer approximately obeys the parabolic rate law after a short transition phase, and the layer is thicker than 65 μm after 15 min. Furthermore, the thickness of the intermetallic layer decreases from 88 to 49 μm with the increase of Ni content from 0 to 1.5% (mass fraction), and the “tongue-shape” interface between the substrate and Fe2Al5 phase becomes smooth. In addition, the microstructure evolution of intermetallic layer of hot dip aluminized ductile cast iron was also discussed.

 

Key words: ductile cast iron; hot dip aluminizing; microstructure evolution; nickel content

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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