材料期刊网

The isothermal oxidation behavior of a cast Ni-base superalloy K52 at 900 degrees C, which compared with Ni-base superalloy YC104-B-H, was investigated. The bases of the experiment and theory were provided for designing and applying superalloy K52. The results indicate that oxidation kinetics obeyed parabolic law for the two kinds of superalloys. The resistance oxidation belongs to I grade for K52 and YC104-B-H superalloys at 900 degrees C. The scales on the surface were determined by X-ray diffraction, scanning electron microscopy(SEM), and EPMA equipped with an EDAX unit. The results show that oxidation scales of K52 superalloy is similar to that of YC104-B-H one, and the oxidation scales consisted of three parts: which the external layer without protective discrete is mainly formed with TiO2, and a protective continuous compact Cr2O3 layer with a certain amount of NiCr2O4 is intermediate layer, as well as the internal layer is mainly Al2O1 with a small amount of TiO2. The oxidation resistance of the superalloy K52 is superior to that of the superalloy YC104-B-H.