钒对铁基碳化钨耐磨堆焊层组织和性能的影响

Effect of vanadium on microstructure and performance of tungsten carbide hardfacing alloys

在自研制的碳化钨管状药芯焊条中添加不同含量的钒元素(0%~3%)并制备堆焊合金,通过SEM,XRD,EDS等研究分析手段,研究不同钒含量对碳化钨耐磨层组织性能的影响规律.结果表明,钒含量与堆焊层中碳化钨颗粒的溶解程度密切相关,钒优先将碳化钨颗粒分解出的碳原子以碳化钒形式固定,从而抑制了碳化钨颗粒的分解,钒元素含量决定了碳化钨溶解的强弱,含有2%钒元素的堆焊层中生成适量碳化钒有效抑制了碳化钨的溶解.钒元素的加入还能强化碳化钨堆焊层基体金属的硬度,降低堆焊层中碳化钨颗粒剥落的风险,有效提高了堆焊层的耐磨性.

In this study,the vanadium content from 0% to 3% were introduced into the tungsten carbide electrodes to prepare hardfacing layer.The products were analyzed by SEM,XRD and EDS,and the effects of vanadium content on the variation of microstructure,abrasive wear resistance and dissolution of the tungsten carbide hardfacing layer was investigated.Result shows that the tungsten carbide dissolution depends on vanadium concentration,as the primarily formed vanadium carbide particles around tungsten carbide retrain the dissolution of tungsten carbide;the amount of vanadium concentration determines the intensity of the dissolution of tungsten carbide,the alloy with 2% vanadium effectively retains the dissolution of tungsten carbides in the alloy.While the vanadium carbide particles increase the matrix hardness to avoid tungsten carbide peel off,hence to improve the abrasive wear resistance of the hardfacing layer.