Effect of elements distribution on oxidation behavior of a nickel-based single crystal superalloy

The oxidation behavior of a fourth-generation nickel-based single crystal superalloy with different heat treatments were studied at 1100 °C in air. The specimens were divided into three groups, one as-cast group, and two heat-treated groups: solution treated and fully heat treated. The elemental distribution is mainly affected by the solution temperature, the higher the solution temperature, the more uniform the distribution of elements. Heat treatment can effectively reduce the difference in oxidation behavior between dendritic region and interdendritic region. However, due to the inability to form a continuous Al2O3 layer, the oxidation resistance of heat-treated specimens degrades.