镍基单晶合金气膜孔结构的制备质量评价

Preparation Quality Characterization of Ni-based Single Crystal Alloy with Gas Film Pore Structure

镍基单晶合金(NSCA)气膜孔结构制备质量已成为制约高性能航空发动机装备应用和发展的关键因素,然而,由于制备过程中形成的微结构变化难以定量表达,很难对不同工艺下的制备质量进行定量评价。利用兰姆波对金属材料微损伤敏感的优势,结合分子动力学模拟分析了不同工艺下制备质量的影响机理,确立了NSCA合理的激发角度(19.5°)、激发频率(2.05 MHz)及基准特征参数(7.58 e^(-4)/mm)。并通过理论和实验揭示了制备缺陷与二次谐波间的构效关系,为后续工程化应用提供理论依据。

The preparation quality of Ni-based single crystal alloy(NSCA)with gas film pore structure has become a key factor restricting the application and development of high-performance aero-engine equipment.However,due to the difficulty of quantitatively expressing the microstructure changes during the preparation process,it is difficult to quantitatively evaluate the preparation quality under different processes.In the present study,taking the advantages of ultrasonic guided wave that is sensitive to metal material micro-damage and has high detection efficiency and detection accuracy,excitation frequency(2.05 MHz)and benchmark characteristic parameters(7.58 e^(-4)/mm)of NSCA are determined,and then the influence mechanism of different preparation quality defects on the nonlinear parameters of guided wave is clarified by theoretical and experimental analysis,which will provide theoretical basis research for the subsequent efficient and controllable preparation of NSCA with gas film pore structure.