X-ray phase analysisof the filler composition based on W B – FeCr – FeV
The authors believe that development of wear resistant coating compositions basedon W Bis an important task aimed at improvement of durability of working parts of2 2machines. X-ray analysis of coating composition W B – FeCr – FeV is presented in the2 2article. The results of chemical and X-ray analyses of the coating composition comprisingW B – FeCr – 10 % FeV demonstrate that, when the weld metal formed, W Bpartially2 5 2 5dissociates to form borides, vanadium, iron, and chromium. High iron content in thesolid solution causes reduction of its hardness and wear resistance. A 20 % increase in the tungsten boride content leads to formation of elongated grains in the matrix of ironborides, vanadium and chromium borides. A composition containing 4 % of W Bhas a2 5fine-grained structure, and it is characterized by the absence of FeB in the weld metal,and its absence means lower brittleness. In the metal, carbon borides are formed to assure its high hardness. In the matrix, a significant amount of vanadium and chromium is dissolved to help improve its hardness. The study shows that the composition containing40 % of W Bhas a fine-grained structure, and it is characterized by the absence of FeB2 5in the weld metal. Therefore, the coating layer demonstrates the highest resistance toabrasion.