| 摘要: |
| 采用等离子弧粉末堆焊技术在Q235钢表面分别堆焊高铬铸铁和WC增强型高铬铸铁，通过对各堆焊层的显微组织、化学成分、显微硬度、耐磨性和耐蚀性进行对比分析，揭示WC颗粒对高铬铸铁堆焊层的影响。结果表明，高铬铸铁堆焊层显微组织由初生(Fe,Cr)7C3和共晶组织组成，WC增强型高铬铸铁堆焊层由初生碳化物、WC颗粒和共晶组织组成。与高铬铸铁相比，WC增强型高铬铸铁由于WC的加入，初生碳化物面积分数非常高，共晶组织数量相应减少；WC增强型高铬铸铁的硬度，耐电解腐蚀性和耐热腐蚀性均优于高铬铸铁。两种堆焊层熔合线处的硬度陡降，结合线扫描结果说明，WC的加入不影响WC增强型高铬铸铁堆焊层与基体界面处的冶金结合和堆焊质量。 |
| 关键词: 等离子弧堆焊 碳化钨 高铬铸铁 Q235钢 |
| DOI：10.11933/j.issn.1007-9289.2015.06.015 |
| 分类号: |
| 基金项目: |
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| Structure and Properties of WC Reinforced High Chromium Cast Iron Surfacing Layer Deposited by Plasma Arc Welding |
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ZHANG Guodong, LI Li, CAO Hongmei1,2
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1. Wuhan University;2. Shanghai Aircraft Manufacturing Co.,Ltd.
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| Abstract: |
| High chromium cast iron and WC reinforced high chromium cast iron surfacing layers were deposited on the surface of Q235 steel by plasma arc welding. Influence of WC particles on the high chromium cast iron surfacing layers was revealed by analyzing the microstructure, chemical composition, microhardness, abrasive resistance and corrosion resistance. The experimental results shows that the high chromium cast iron surfacing layer consists of primary (Fe,Cr)7C3 and eutectics while WC reinforced high chromium cast iron surfacing layer consists of primary carbides , WC particles and eutectics. Due to the addition of WC, WC reinforced high chromium cast iron surfacing layer shows a sharp increase in primary carbides and a corresponding reduction in eutectics in comparison with the high chromium cast iron surfacing layer. Besides, WC reinforced high chromium iron surfacing layer has higher hardness, better electrolytic corrosion resistance and hot corrosion resistance. A combination of a steep drop in hardness occurring in the fusion lion of the two surfacing layers with the results of EDS indicats that the addition of WC has no bad effect on the metallurgical bonding with the matrix metal and welding quality. The results will provide a scientific guidance for promoting the application of the technology in engineering especially in electrolytic aluminum industries. |
| Key words: plasma arc welding tungsten carbide high chromium cast iron Q235 steel |
