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本文在改装的Bn-2持久试验机上较全面地研究了梯形波、正弦波及特定程序波等温度循环对航空发动机用镍基高温合金GH_(33)和铁基高温合金GH_(36)断裂寿命的影响。根据实验结果提出了:(1)在特定程序波温度循环下,预测断裂寿命的线性方程及(2)特定程序波温度循环下断裂时间,应力与脉冲温度幅值之间的关系式。预测的温度循环断裂寿命与实验结果符合较好。实验结果还指出:热应力对温度循环断裂寿命的影响不是主要因素,观查了不同温度循环下的断口形貌。
In this paper, the modified Bn-2 durability testing machine more comprehensive study of the trapezoidal wave, sine wave and a specific program wave temperature cycle for the aeroengine nickel-based superalloy GH_ (33) and iron-based superalloy GH_ (36) rupture life influences. Based on the experimental results, the following conclusions are drawn: (1) The linear equation predicting the fracture life under the specific program wave temperature cycle and (2) the relationship between the fracture time, stress and pulse temperature amplitude under the specific program wave temperature cycle. The predicted temperature cycle fracture life is in good agreement with the experimental results. The experimental results also point out that the influence of thermal stress on the temperature cycling rupture life is not the main factor, and the fracture appearance under different temperature cycles is observed.