微/纳米WC粉末碳弧制备工艺及其涂层组织

Preparation Process and Coating Microstructure of Micro/nanometer WC Powders by Carbon Arc Welding

利用碳弧堆焊将主要由微/纳米WC粉末组成的合金粉块熔敷在普通碳钢上,在对该粉块进行工艺性试验的基础上,采用OM、SEM、EDS、XRD等测试方法对涂层进行了分析。结果表明:和微米级粉末相比,该粉块焊接工艺性良好,熔敷效率高;堆焊层中WC已经发生转变,堆焊层组织主要为富W碳化物(Fe3W3C)、板状马氏体、共晶化合物和残余奥氏体;焊后堆焊层硬度在63HRC以上,最高可达65HRC,表面硬度分布均匀。

The alloy powder block with micro/nanometer WC powder additive,was deposited on the surface of the plain steel by carbon arc.Base on the process property tests,the microstructure and composition of the coating were investigated by OM,SEM,EDS,and XRD.The results show that the powder block has good welding process performance and high deposition efficiency.The microstructure of the coating mainly contain W-enriched carbides Fe3W3C owing to the transition of WC,plate-like Martensite,eutectic compounds and residual austenite.The surface hardness of the coating is between 63HRC to 65HRC,which is evenly distributed.