等离子弧堆焊WC增强型高铬铸铁的组织和性能

发布时间：2018-06-14 06:22

本文选题：等离子弧堆焊 + 碳化钨　；参考：《中国表面工程》2015年06期

【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。
[Abstract]:High chromium cast iron and WC enhanced high chromium cast iron were surfaced on the surface of Q235 steel by plasma arc powder surfacing technology. The microstructure, chemical composition, microhardness, wear resistance and corrosion resistance of each surfacing layer were compared and analyzed. The effect of WC particles on surfacing layer of high chromium cast iron was revealed. The results show that the microstructure of the surfacing layer of high chromium cast iron is composed of primary Fe _ (10) Cr _ (7) C _ (3) and eutectic structure. The microstructure of WC-enhanced high chromium cast iron surfacing layer is composed of primary carbides, WC particles and eutectic structure. Compared with high chromium cast iron, the area fraction of primary carbides of WC reinforced high chromium cast iron is very high because of the addition of WC. The number of eutectic structure reduces the hardness, electrolysis corrosion resistance and heat resistance of high chromium cast iron, which are better than those of high chromium cast iron. The hardness of the fusion line of the two kinds of surfacing layers dropped sharply. The results of line scanning show that the addition of WC does not affect the metallurgical bonding and surfacing quality at the interface between WC enhanced high chromium cast iron surfacing layer and matrix.
【作者单位】：武汉大学动力与机械学院;武汉大学水射流理论与新技术湖北省重点实验室;上海飞机制造有限公司;
【基金】：国家自然科学基金(51374154) 湖北省自然科学基金(2014CFB707) 教育部博士研究生学术新人奖(5052012208001)
【分类号】：TG455

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