Crack Repair in Heat Resisting Superallloys applying Stress Field Assisted Diffusion Phenomenon

本文结合应力场辅助扩散现象和微火花涂层，探索了一种修复高温镍基合金疲劳裂纹的工程新方法和新工艺。一系列的实验工作表明，所提出的方法对于在实验室条件下人为复制的疲劳裂纹的修复是非常成功的。这些结果被总结成一个新的损伤图，显示了哪些在役条件下所提出的修复方法更有效。

This work has explored a new engineering method and process to repair the fatigue cracks in heat resisting Ni-based superalloys, combining the stress field assisted diffusion phenomenon and a micro-spark coatings. A series of the experimental works showed that the proposed method was very successful for the repair of the fatigue cracks which were artificially reproduced under the laboratory conditions. These results were summarized into a new damage map showing what in-service condition(s) is(are) more effective to which the proposed repair method is applied.