碳化铌对铁基碳化钨耐磨堆焊合金中碳化钨溶解的影响

Influence of niobium content on WC dissolution in iron-based hardfacing alloy

摘要: 采用自行研制的铁基碳化钨耐磨堆焊药芯焊丝,通过钨极氩弧焊(TIG)在Q235上制备Fe-Nb-C-B-Ni-WC(30%)合金.改变合金中铌含量(1.0%,2.5%,3.8%),研究铌含量对Fe-Nb-C-B-Ni-WC(30%)合金中碳化钨溶解的影响.结果表明,铌含量对合金中碳化钨的溶解程度有很大影响,优先在碳化钨周围生成的细小NbC对碳化钨溶解起抑制作用,而其生成量决定了抑制碳化钨溶解作用的强弱.铌含量为2.5%的合金中生成的NbC有效的抑制了碳化钨的溶解,使碳化钨颗粒保留的比较完整.

Abstract: The Fe-Nb-C-B-Ni-WC(30%)iron-based tungsten carbide wear resistant hardfacing alloy was deposited on the Q235 byargontungsten-arcwelding (TIG) using flux-cored wire. The effect of niobium content on the dissolution of tungsten carbide in the alloy was studied by changing the niobium content from 1.0% to 3.8%. The results show that niobium content has a great influence on the degree of dissolution of tungsten carbide in the alloy. The primarily precipitated fine NbC particles around the tungsten carbide inhibit the dissolution of tungsten carbide. The amount of fine NbC determines the intensity of the inhibitory effect on the dissolution of tungsten carbide. The alloy with 2.5% niobium effectively inhibit the dissolution of tungsten carbide in the alloy, the original tungsten carbide particles were reserved more completely.