【摘要】 基于宏观唯象蠕变模型编写有限元子程序，对真实涡轮叶片进行蠕变变形行为模拟与分析。通过模拟服役环境下涡轮叶片蠕变变形行为，确定涡轮叶片实际使用过程中的重点考核部位；分析存在蠕变时应力集中部位的应力松弛现象，对比应力松弛前后考核部位的持久寿命预测结果。通过改变晶轴与叶高方向的偏离角，模拟实际工程应用中存在许用范围内偏离角的情况。结果表明：涡轮叶片重点考核部位一般位于扰流柱根部和冷却通道拐角处，该部位随着蠕变进行产生应力松弛现象，影响涡轮叶片的预测持久寿命；工程中设计偏离角的许用范围为10°是恰当的，超过这个范围涡轮叶片材料蠕变性能下降明显。更多还原

【Abstract】 Based on the macroscopic phenomenological creep model,the finite element subroutine was compiled to simulate and analyze the creep deformation behavior of real turbine blades. In the engineering practice, through simulation of creep deformation in service environment, the important assessment positions of turbine blades were determined. Considering the effect of creep, the stress relaxation effects on the concentration positions were analyzed,and the prediction endurance life of the verifying positions with/without stress relaxation was compared. By changing the deviation angle between the crystal axis and the blade height direction,the allowable deviation angle in the engineering application was simulated. These results indicated that the important assessment positions of turbine blades were generally located at the root of the spoiler columns and the corner of the cooling channels. The stress relaxation phenomenon occurred at these positions with the creep progresses, affecting the prediction endurance life of turbine blades. The tolerance of deviation angle in engineering was designed as 10°,beyond which the creep performance of turbine blade material decreased significantly.更多还原