ABSTRACT
Experiments have demonstrated the effectiveness of introducing chromium carbide as dispersed particles, coated with a protective plastic layer, during arc hardfacing. The VELTEK-N630-O powder wire was used, and metallographic analysis revealed differences in the shape, amount, and distribution of carbides in deposited layers similar to high-chromium white cast iron. An increased proportion of carbides in the upper part of the layers and fewer cracks should improve wear resistance. Microhardness measurements confirmed a lower initial hardness (HB 483 vs. HB 510 for standard wire), due to the addition of plastic. However, wear tests in a "metal-metal" scheme showed reduced mass loss in samples welded with the experimental wire: 0.158 g versus 0.208 g after 12 hours of rolling friction under a load of 1…1.5 kN
