【摘要】 依据双材料模型分析高温合金氧化膜的应力状态,确定了氧化膜弯曲剥落的最大挠度与氧化膜压应力间关系.利用界面断裂力学理论,建立了高温合金氧化膜剥落的弯曲图.镍基高温合金氧化表面剥落的Al2O3氧化膜,在界面粗糙度参数λ为0.3-0.4,临界弯曲指数Ⅱc为1和临界粘附性指数Σc为1.15时,弯曲剥落特性与实验结果相符.高温合金氧化膜的弯曲图合理解释了氧化膜的弯曲剥落过程.更多还原

【Abstract】 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 A relating to the roughness of the oxide/alloy interface is between 0.3 and 0.4, a critical buckling index Ⅱc is 1 and a critical adhesion index Σc is 1.15. The buckling and spalling course of the oxide scale on the superalloy was successfully explained with the buckling map.更多还原