Anisotropy of Young's Modulus of DD6 from 25 to 1200 °C Based on Nondestructive Dynamic Method

The Young's modulus is an essential factor for improving turbine blade design. The present study aims to obtain the flexural frequencies (f₁) and corresponding dynamic Young's modulus (E_d) of Ni-based single-crystal DD6 across a temperature range of 25–1200 °C using a nondestructive dynamic testing method. The relationship between the elastic constants and various crystal orientations is derived by employing the transformation of the elastic matrix. In addition, finite element (FE) simulation is conducted to calculate the flexural frequency (f₁) of the [001] crystal orientation. The findings indicate that the dynamic Young's modulus (E_d) decreases as the temperature increases within the range of 25–1200 °C. Furthermore, the E_d values for different crystal orientations follow the trend: E_d[1] < E_d[11] < E_d[111]. This suggests significant anisotropy in the material. The normalized model, matrix transformation calculation method, and finite element method demonstrate high accuracy in predicting the elastic modulus of DD6, as evidenced by the good correspondence between the fitting curves obtained using the normalization method and the test results. These results have practical applications in engineering, particularly in turbine blade design and other applications, and serve as valuable references for mechanical property testing and finite element simulations.