The hot section parts in a gas turbine are subject to high working temperatures and mechanical forces. In order to endure the harsh conditions, these parts are generally made of nickel-based superalloys. Furthermore, microholes are drilled on them to help with cooling by allowing the air to pass through. These holes increase the allowable working temperature and service life of the parts as well. Water Jet Guided Laser is a technology that can be conveniently used for microdrilling operations on aerospace jet engine parts. It is a hybrid process, in which a laser beam is coupled with and guided through a thin cylindrical water jet. Pressurized water provides focusing, cooling, and cleaning on the cut region, eliminating undesired side effects of the laser. The technology has many advantages over traditional laser machining, such as consistent focusing, burr-free cutting, minimized tapering, reduced heat affected zone, and recast layer. In this paper, using the Water Jet Guided Laser, variation in process time and quality are studied on different aerospace nickel-based superalloys. The results depend mainly on the thermophysical properties of the processed materials. The experimental results are compared with calculations and correlated to the material properties.

中文翻译：

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航空航天合金的水射流引导激光微钻：材料性能与加工时间和质量的相关性

燃气轮机中的热部分部件要承受较高的工作温度和机械力。为了承受苛刻的条件，这些零件通常由镍基高温合金制成。此外，在其上钻有微孔，以使空气通过，从而有助于冷却。这些孔还增加了零件的允许工作温度和使用寿命。水射流引导激光是一种可以方便地用于航空航天喷气发动机零件上的微钻孔操作的技术。这是一种混合过程，其中激光束与薄的圆柱状水射流耦合并通过薄水射流引导。加压水可对切割区域进行聚焦，冷却和清洁，从而消除了激光的不良副作用。与传统的激光加工相比，该技术具有许多优势，例如一致的聚焦，无毛刺的切割，最小化的锥度，减小的热影响区和重铸层。在本文中，使用水射流引导激光，研究了不同航空航天镍基高温合金的加工时间和质量的变化。结果主要取决于加工材料的热物理性质。将实验结果与计算结果进行比较，并将其与材料特性相关联。