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首页> 外文期刊>Journal of Materials Processing Technology >Investigation of delamination mechanisms during a laser drilling on a cobalt-base superalloy
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Investigation of delamination mechanisms during a laser drilling on a cobalt-base superalloy

机译：钴基高温合金激光钻孔过程中脱层机理的研究

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Temperatures in the high pressure chamber of aircraft engines are continuously increasing to improve the engine efficiency. As a result, constitutive materials such as cobalt and nickel-base superalloys need to be thermally protected. The first protection is a ceramic thermal barrier coating (TBC) cast on all the hot gas-exposed structure. The second protection is provided by a cool air layer realized by the use of a thousand of drills on the parts where a cool air is flowing through. The laser drilling process is used to realize these holes at acute angles. It has been shown on coated single crystal nickel-base superalloy that the laser drilling process causes an interfacial cracking (also called delamination), detected by a cross section observation. The present work aims at characterizing interfacial cracking induced by laser drilling on coated cobalt-base super alloy. On the one hand, this work attempted to quantify the crack by several microscopic observations with regards to the most significant process parameters related as the angle beam. On the other hand, we studied the difference of the laser/ceramic and the laser/substrate interaction with real time observation by using a fast movie camera.
机译：飞机发动机的高压室中的温度不断升高以提高发动机效率。结果，诸如钴和镍基高温合金的构成材料需要被热保护。第一个保护是在所有暴露于热气的结构上浇铸的陶瓷隔热涂层（TBC）。第二种保护是通过在冷空气流过的零件上使用数千个钻头实现的冷空气层来提供的。激光钻孔过程用于以锐角实现这些孔。已经证明，在涂覆的单晶镍基高温合金上，激光钻孔过程会引起界面裂纹（也称为分层），这是通过横截面观察发现的。目前的工作旨在表征涂层钴基超级合金上激光打孔引起的界面开裂。一方面，这项工作试图通过对与角钢有关的最重要的工艺参数的几个微观观察来量化裂纹。另一方面，我们使用快速电影摄影机研究了激光/陶瓷和激光/基板相互作用与实时观察之间的差异。

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