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%.