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现代航空发动机镍基单晶叶片在生产时只控制叶片轴向为结晶方向,其它两个方向则处于随机状态。本文基于晶体滑移理论,计算分析了这种方向随机性对结构强度和蠕变寿命的影响。结果表明,保持轴向为结晶方向,其它两个方向为随机,在额定载荷作用下,某叶片强度储备系数相差20％,蠕变寿命则可相差5.5倍,使得有必要在铸造时对非结晶方向的晶体取向进行控制。本文进一步计算了叶片轴向与结晶方向偏角对性能的影响,偏角5°,蠕变失效寿命最大降低23％;两偏角10°,蠕变失效寿命最大降低一半,即严格控制轴向偏角对叶片也是至关重要的。
Modern aeroengine nickel-based single crystal blades in the production of only the blade axis for the control of the crystal direction, the other two directions are in a random state. In this paper, based on the theory of crystal slip, the influence of this direction randomness on the structural strength and creep life is calculated and analyzed. The results show that the axial direction of the crystal to keep the direction of the other two directions are random under the rated load, a blade strength reserve coefficient difference of 20%, the creep life can be a difference of 5.5 times, making it necessary in the casting of amorphous Direction of the crystal orientation control. In this paper, further calculation of the blade axial and crystal direction angle on the performance of the declination angle of 5 °, the maximum creep failure life reduced by 23%; two declination 10 °, the maximum creep failure life reduced by half, that is strictly controlled by the axial Declination on the blade is also crucial.