【摘要】 根据单晶镍基高温合金蠕变过程的微观机制,提出采用θ蠕变曲线方程对其进行蠕变曲线的预测.首先,应用该方法对1 100℃1、50 MPa下的实测蠕变曲线进行拟合;然后,依据不同条件下的拟合结果求出方程中5个基本参数的数学表达式,再通过θ蠕变曲线方程对合金在1 100℃、120 MPa条件下的蠕变曲线进行预测.结果显示,该方程很好地再现了单晶镍基高温合金蠕变曲线的前两个阶段,其精度是以往预测方法所不能达到的.表明,用本方法预测单晶镍基高温合金的蠕变寿命具有实际意义,文中给出的θ蠕变曲线方程是可以信赖的.更多还原

【Abstract】 Based on the micro-mechanism of the creep,a θ creep curve equation was proposed to predict creep curves for the single crystal nickel-based superalloy.Firstly,the creep curve measured at 1?100?℃ and 150?MPa was fitted.According to the fitted result,the temperature and stress dependence of the five(material) constants in the equation was established. Then,the creep curve at 1?100?℃ and 120?MPa was(predicted).The(results) show that for the single crystal nickel-based superalloy,the proposed equation can well describe the two stages of the creep curve with a satisfactory accuracy.The accuracy of this methodis the best in some predicted method.It is recognized that this method should be useful for predicting the creep life of single crystal nickel-based superalloy.更多还原