研究目的
To explore the mechanism of crack generation in ultrafast laser drilling of thermal barrier coated nickel superalloy and to suggest strategies to reduce thermal effects.
研究成果
The study successfully established a thermo-mechanical coupled model to analyze crack behavior in ultrafast laser drilling of thermal barrier coated nickel superalloy. The model explained the mechanism of crack generation and suggested strategies to reduce thermal effects, such as using low pulse repetition rate or water jet assisted method.
研究不足
The model simplifies the physical process by ignoring melting, recoil pressure, and the absorption of laser by the vapor and plasma. The elastic model used for thermal stress calculation ignores plastic effects.
1：Experimental Design and Method Selection:
A thermo-mechanical coupled model was established to simulate the drilling process, including laser beam scanning, laser intensity attenuation, and the nonlinear relationship between drilling depth and drilling time.
2：Sample Selection and Data Sources:
The material used was a multilayer system consisting of a TBC layer, a bond coat (BC) layer, and a substrate. Data was collected using industrial computed tomography (CT) and Raman spectroscopy.
3：List of Experimental Equipment and Materials:
A pulsed laser (TruMicro 5050) with a wavelength of 1030 nm was used for drilling. The material properties were temperature-dependent and listed in a table.
4：Experimental Procedures and Operational Workflow:
The laser drilling process was monitored, and the drilled samples were analyzed using CT, SEM, and Raman spectroscopy to evaluate hole quality and crack behavior.
5：Data Analysis Methods:
The stress distribution was analyzed using digital image correlation (DIC) method, and the phase transformation was quantified using Raman spectroscopy.
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