Effect of elements distribution on oxidation behavior of a nickel-based single crystal superalloy. (March 2023) - Li, Weiqi
Abstract: 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 Al2 O3 layer, the oxidation resistance of heat-treated specimens degrades. Highlights: The elements distribution will affect the oxidation behavior of superalloys. The Al content of the region will affect the morphology of the internal Al2 O3 layer. Heat treatment can reduce the oxidation difference between dendritic region and interdendritic region. After heat treatment, the alloy is more prone to large-scale oxide spalling.