In this paper, creep-fatigue behaviors of the thin-walled tubular specimen with film holes were experimentally studied to address the influence of cyclic stress interruptions on creep strength and creep-fatigue life of a directionally solidified superalloy. The specimens with and without multiple holes were designed and manufactured to consider the effect of stress concentration produced by film cooling holes. The creep life of the specimen with holes has reduced significantly with the introduction of fatigue. An interesting result was found that the creep strength and life was enhanced on the stress concentrated specimens even if the creep loading was interruption by fatigue loadings, while creep fatigue life will be commonly shortened for notched specimen. Failure mechanisms related with cooling holes were analyzed on the basis of microscope observation.

在本文中，通过实验研究了带膜孔的薄壁管状试样的蠕变疲劳行为，以解决循环应力中断对定向凝固高温合金蠕变强度和蠕变疲劳寿命的影响。有孔和无孔试件的设计和制造考虑了薄膜冷却孔产生的应力集中的影响。随着疲劳的引入，带孔试样的蠕变寿命显着降低。一个有趣的结果是，即使蠕变加载被疲劳加载中断，应力集中试样的蠕变强度和寿命也会提高，而缺口试样的蠕变疲劳寿命通常会缩短。