Effect of boron, cerium, and zirconium on the properties of khN65VBMYu castings

1. Separate and combined additions of boron, cerium, and zirconium to alloy KhN65VBMYu refine the macrostructure and change the phase composition and kinetics of structural transformations. 2. Additions of boron, cerium, and zirconium increase the creep strength at operating temperatures and the scale resistance at temperatures above 800°. With separate alloying the best heat resistance is obtained with 0.15% Ce, and with combined alloying with 0.15% Ce+0.1% B. 3. Combined alloying with boron, cerium, and zirconium increases the heat resistance of cast turbine wheels for turbocompressors by a factor of 1.5–2 and increases the service life of engines.