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采用等离子堆焊技术在304L不锈钢表面上堆焊碳化钨颗粒增强镍基合金层。研究了不同碳化钨颗粒含量对堆焊层组织形态、显微硬度的影响。结果表明,堆焊层组织包括树枝晶和枝晶间多元共晶组织;堆焊层中初始碳化钨颗粒沉积在堆焊层底部,堆焊层顶部无碳化钨区域出现新的鱼骨状和块状结构。在堆焊过程中,碳化钨颗粒发生熔解并与镍基合金元素相互作用形成低熔点共晶组织,以块状和长片状析出。随碳化钨含量增加,堆焊层平均硬度增加,堆焊层顶部鱼骨状和块状结构对堆焊层硬度没有影响。
Using plasma surfacing technology in the 304L stainless steel surfacing tungsten carbide particles reinforced nickel-based alloy layer. The effect of different tungsten carbide particles on the microstructure and microhardness of overlay was studied. The results show that the surfacing layer consists of dendrite and dendritic multiple eutectic structures. The initial tungsten carbide particles in the surfacing layer are deposited at the bottom of the surfacing layer, and the new fishbone and block appear in the top of the surfacing layer without tungsten carbide structure. During the surfacing process, the tungsten carbide particles melt and interact with the nickel-based alloying elements to form a low melting point eutectic structure that precipitates in a lumpy and long form. With the increase of tungsten carbide content, the average hardness of overlay increases, and the fishbone and block structure at the top of overlay have no effect on the overlay hardness.