钒对Fe-Cr-C耐磨堆焊层性能的影响

在Fe-Cr-C耐磨堆焊合金中加入钒,研究钒对Fe-Cr-C耐磨堆焊合金焊态和焊后热处理态性能的影响.采用埋弧堆焊方法在Q235低碳钢基体上制备了堆焊层,利用光学金相、SEM分析了堆焊合金的显微组织,并进行了硬度和磨料磨损试验.结果表明,焊后加热对Fe-Cr-C耐磨堆焊合金的硬度有较大影响.经过焊后加热,基体组织的硬度降低值都大于22%,降低值最大的是不含钒的Fe-Cr-C耐磨堆焊合金,达到37.7%.焊后加热对初生碳化物M7C3的硬度影响较小,其硬度降低值为1.4%～11.3%.含0.4%V可以有效的提高Fe-Cr-C耐磨堆焊合金高温热处理后的耐磨料磨损性能.以淬火态的45钢为标样,在经过900℃焊后热处理,含0.4%V的Fe-Cr-C耐磨堆焊合金相对耐磨性为1.9,而同样条件下不含钒的试样相对耐磨性只有1.3,两者相比,含0.4%V的合金相对耐磨性提高了46%.

Effect of vanadium on property of Fe-Cr-C hardfacing alloy

Vanadium was added to Fe-Cr-C hardfacing alloy and its effect on the property of the alloy when welded and reheated was studied.The hardfacing layers were produced on Q235 mild steel by submerged arc welding method.The microstructures,worn surface of the overlayer were examined by means of optical microscope and scanning electron microscopy(SEM).Abrasive wear resistance and hardness were tested.The results showd that heating process had effect on the hardness of the alloy.The hardness of matrix decreased more than 22% by reheating.The max hardness decreased 37.7% with no vanadium.But it has little effect on the hardness of primary carbide of which the hardness decreased only 1.4%-11.3% by reheating.Vanadium could increase the abrasion property of post-heated Fe-Cr-C hardfacing alloy.Using the loss weight of quenched 45 sample as abrasion test bench mark,the lative abrasion value of the alloy content of 0.4% vanadium was 1.9.In the same condition,that of the alloy with no vanadium content was only 1.3.The abrasion property increased 46%.