碳弧堆焊原位合成颗粒增强Fe-05合金涂层的组织、硬度及耐磨性研究

Study on Microstructure, Hardness and Wear Resistance of In-situ Synthetic Particle Reinforced Fe-05 Alloy Coating by Carbon Arc Surfacing

采用碳弧堆焊技术,通过改变堆焊电流,在16Mn基材表面堆焊Fe-05合金粉块,制备具有原位生成增强相的铁基合金涂层。分析不同堆焊电流对堆焊层显微组织、硬度和耐磨性的影响。结果表明,涂层主要由基体α-(Fe,Cr)固溶体和原位合成的(Fe,Cr)7C3、Cr23C6、Cr7C3、Fe2B、Fe3B及Cr Fe B等硬质相组成。从堆焊表面到基材,显微硬度总体呈下降趋势,随着堆焊电流的增加,涂层的显微硬度明显增高。涂层耐磨性随堆焊电流的增加呈先上升后下降的趋势,堆焊电流为250 A时的涂层耐磨性最高,堆焊电流为270 A时的涂层耐磨性最低。

The iron-based alloy coating with in-situ reinforced phase was prepared by surfacing Fe-05 alloy powder on the surface of 16Mn substrate by carbon arc surfacing technology and changing the surfacing current.The effects of different surfacing current on the microstructure,hardness and wear resistance of surfacing layer were analyzed.The results show that,the coating is mainly composed ofα-(Fe,Cr) solid solution matrix and insitu spnthesis (Fe,Cr)7C3,Cr23C6,Cr7C3,Fe2B,Fe3b and Cr Fe B hard phase.From overlaying surface to substrate,the microhardness is generally decreasing.With the increase of surfacing current,the microhardness of the coating increases obviously.The wear resistance of the coating decreases with the increase of the surfacing current,and the wear resistance of the coating is the highest when the surfacing current is 250 A,and the wear resistance of the coating is the lowest when the surfacing current is 270 A.