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由于目前,国外已经基于八面体滑移系,采用临界平面法对镍基单晶高温合金〈001〉取向的高周疲劳寿命进行预测.然而,该方法未考虑〈111〉取向受载时滑移系参量的特点,所以不能较准确地预测镍基单晶高温合金〈111〉取向的高周疲劳寿命.为此,选取临界平面时综合考虑六面体、八面体滑移系,选定疲劳参量最大的滑移面作为临界平面,采用SSR(shear stress range),CCB(Chu-Conle-Bonnen),Walls寿命模型进行镍基单晶高温合金高周疲劳寿命预测,并根据800℃下DD6镍基单晶高温合金〈001〉,〈011〉,〈111〉3个取向的高周疲劳试验结果,对寿命模型的预测精度进行验证.结果表明:当基于两种滑移系预测镍基单晶高温合金的高周疲劳寿命时,寿命模型的拟合系数可达到0.913 4.
Due to the octahedral slip system abroad, the critical plane method is used to predict the high-cycle fatigue life of <001> oriented nickel-base single crystal superalloy. However, this method does not consider the slip of <111> Therefore, the high-cycle fatigue life of the <111> oriented Ni-based single crystal superalloy can not be more accurately predicted.Therefore, considering the critical plane, considering the hexahedron and octahedron slip system, the maximum fatigue parameter is selected Slip surface as a critical plane, the high-cycle fatigue life prediction of Ni-based single crystal superalloy was carried out by using the shear stress range (SSR), the Chu-Conle-Bonnen (CCB) The results of high-cycle fatigue test of <001>, <011> and <111> high-temperature alloys show that the prediction accuracy of life model is validated. The fitting coefficient of lifetime model can reach 0.913 4 when the high cycle fatigue life is high.