Role of alloying elements in oxide film formation on VT14 alloy at 1100 deg C

The methods of metallographic, X-ray structural, spectral analyses and microhardness measurements have been used to study the role of alloying elements of the VT14 alloy (5.3% Al - 3.3% Mo - 1.1% V) in the oxide film formation and their effect on the heat resistance level at the temperature of 1100 deg C. On the basis of results obtained the following procedure of oxide film formation is suggested. After oxidation at 1000 deg C for 1 hour the scale consists of TiO2 and Al2O3, HoO3 oxides. The increase of holding-up brings about the destruction of Al2O3 layer and the role of molybdenum and vanadium oxides that have a low melting temperature and are present in the liquid phase, increases. These processes intensify oxidation of the VT14 alloy