| Popis: |
Structural investigations of steel surface layers alloyed with vanadium, titanium and graphite were carried out using optical microscopy, scanning electron microscopy (SEM) and X-ray diffraction analysis methods. Coatings were obtained by high-energy electron beam treatment. The titanium – vanadium ratio in initial powder mixtures was as 2:1, 1:1 and 1:2. TiC, a-Fe (ferrite), eutectic consisted of VC and a-Fe were the main structural components of the coating: With an increase of vanadium content shapeless TiC particles turned into dendritic; tertiary dendritic arms consisted of VC. In addition, it also resulted in an increase of carbide particle sizes. The volume fraction of strengthening particles in all coatings was approximately identical (18 %). |
