Circular holes on single crystal (SX) superalloys are widely utilized as film cooling structures on SX turbine blades, while their failure is a persistent issue. This study presents in-situ tests using digital image correlation (DIC) to reveal the slip band (SB) evolution behavior near the circular hole on SX superalloy, and proposes a mechanism-based model to capture the SB-associated evolutions of stress, strain, and damage fields. In the experiment part, high-temperature in-situ tensile tests are carried out under scanning electron microscope on plate-like SX specimens with circular hole, which can achieve the in-situ measurement and observation for the SB-induced strain concentration and microcrack nucleation. Experimental results reveal the effects of secondary orientation and temperature on stress-strain curve, SB evolution and SB direction. Besides, the microstructure observation shows that the γ´ phase shear is the primary cause of strain concentration inside SB. In the simulation part, a physics-based SB evolution model is proposed under the framework of crystal plasticity. For the regions inside and outside SB, different critical resolved shear stresses are utilized as the plasticity criteria, and different slip resistances are used as internal state variables in the flow rule to simulate the SB-induced strain concentration. A damage evolution rule is developed based on the plastic work density in slip systems to simulate the microcrack nucleation near the hole edge. Finally, the proposed model is validated through the experiments. The model can effectively simulate the SB initiation/evolution, SB direction, SB-induced strain concentration, and the microcrack nucleation near circular hole on SX superalloy.

单晶 (SX) 高温合金上的圆孔被广泛用作 SX 涡轮叶片上的薄膜冷却结构，而它们的失效是一个长期存在的问题。本研究提出了使用数字图像相关 (DIC) 的原位测试来揭示 SX 高温合金圆孔附近的滑带 (SB) 演化行为，并提出了一个基于机制的模型来捕捉与 SB 相关的应力、应变演化, 和伤害领域。实验部分在扫描电镜下对带圆孔的板状SX试样进行了高温原位拉伸试验，实现了SB引起的应变集中和微裂纹形核的原位测量和观察。 . 实验结果揭示了二次取向和温度对应力-应变曲线、SB 演化和 SB 方向的影响。此外，微观结构观察表明γ'相剪切是SB内部应变集中的主要原因。在仿真部分，在晶体塑性框架下提出了基于物理的SB演化模型。对于SB内部和外部区域，不同的临界分解剪应力被用作塑性准则，并且不同的滑移阻力被用作流动规则中的内部状态变量来模拟SB引起的应变集中。基于滑移系统中的塑性工作密度开发了损伤演化规则，以模拟孔边缘附近的微裂纹形核。最后，通过实验验证了所提出的模型。该模型可以有效地模拟SB的萌生/演化、SB的方向、SB引起的应变集中、