Interface Fracture Mechanics of Failure For Oxide Scale on Superalloy
高温合金氧化膜破坏的界面断裂力学分析

The stress state of the oxide scale on superalloy was analyzed using a bimaterial mode. The relationship between the maximum buckling deflection of oxide scale and the compressive stress of oxide scale was determined. Based on interface fracture mechanics, the buckling map for spalling was established. The spalling characteristics of the oxide scale described by the buckling map is consistent with the experimental data for the Al2O3 scale on the Ni-based superalloy under the conditions that the parameter relating to the roughness of the oxide alloy interface is between 0.3 and 0.4, a critical buckling index is 1 and a critical adhesion index is 1.15. The buckling and spalling course of the oxide scale on the superalloy was successfully explained with the buckling map.