本文研究了正弦及特定程序波温度循环对一种镍基高温合金持久寿命的影响。实验证明复杂温度循环可以明显降低合金的持久寿命。其降低的程度与温度的幅值大小有关。提出了特定程序波温度循环预测合金断裂寿命的公式,并用扫描电镜观察了合金的断口。
The stress-rupture life of a Ni-base superalloy has been evaluated under the cyclic temperatures by using the sinusoidal or the specified program-controlled waveform. It was shown that its stress-rupture life is considerably reduced by the temperature cycle. The extent of reduction is depended on the amplitude of the cycle. The formulation of life prediction for specified program-controlled temperature cycle is proposed. The fracture surface of the superalloy has also been observed by SEM.
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