Effects of Tungsten Addition on the Microstructure and Corrosion Resistance of Fe-3.5B Alloy in Liquid Zinc
Effects of Tungsten Addition on the Microstructure and Corrosion Resistance of Fe-3.5B Alloy in Liquid Zinc
复制标题
添加钨对Fe-3.5B合金在锌液中显微组织和耐蚀性的影响
DOI：
10.3390/ma10040399
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发表时间：
2017-04-01
期刊：
影响因子：
3.4
通讯作者：
Li, Zhi
中科院分区：
文献类型：
--
作者：
Liu, Xin;Wang, Mengmeng;Li, Zhi
采用扫描电镜、X射线衍射和电子探针等分析手段，研究了添加钨对Fe-3.5B合金显微组织和在520 ℃锌液中耐蚀性的影响。利用外推的Fe-B-W三元相图分析和讨论了不同合金的组织演变。实验结果表明，硼化物有三种类型：网状（Fe，W）（2）B、棒状（Fe，W）（3）B和花状FeWB。钨的加入细化了网状硼化物的组织，提高了网状硼化物的稳定性。此外，还有利于亚稳（Fe，W）（3）B相的形成。所得Fe-3.5B-11 W（wt %）合金具有优异的耐液态锌腐蚀性能。当钨含量超过11wt%时，形成的花状FeWB相破坏了网状硼化物的完整性并导致耐腐蚀性劣化。本文还讨论了硼化物晶界微裂纹的萌生导致硼化物剥落而引起的腐蚀失效。
The effects of tungsten addition on the microstructure and corrosion resistance of Fe-3.5B alloys in a liquid zinc bath at 520 degrees C were investigated by means of scanning electron microscopy, X-ray diffraction and electron probe micro-analysis. The microstructure evolution in different alloys is analyzed and discussed using an extrapolated Fe-B-W ternary phase diagram. Experimental results show that there are three kinds of borides, the reticular (Fe, W)(2)B, the rod-like (Fe, W)(3)B and flower-like FeWB. The addition of tungsten can refine the microstructure and improve the stability of the reticular borides. Besides, it is beneficial to the formation of the metastable (Fe, W)(3)B phase. The resultant Fe-3.5B-11W (wt %) alloy possesses excellent corrosion resistance to liquid zinc. When tungsten content exceeds 11 wt %, the formed flower-like FeWB phase destroys the integrity of the reticular borides and results in the deterioration of the corrosion resistance. Also, the corrosion failure resulting from the spalling of borides due to the initiation of micro-cracks in the grain boundary of borides is discussed in this paper.