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在已有文献的基础上,利用Larson-Miller参数法对700℃超超临界电站候选合金Inconel 617的持久数据进行了研究。结果表明,Inconel 617合金持久强度的预测精度与LMP建模所用数据关系密切;与利用595~1 095℃范围内的所有实验点建模相比,由900℃以下数据外推所得持久强度预测值与参考值/真实值更为一致。进一步对显微组织的研究表明产生上述现象的原因与合金在高温段(900℃及以上)的显微组织,特别是强化相的类型、数量等均发生了明显变化有关。因此,在评估此类合金的持久性能时,应慎用高温区数据,从而降低性能的误估倾向。
Based on the existing literature, the long-term data of Inconel 617, a candidate alloy of 700 ℃ ultra-supercritical power station, was studied by Larson-Miller parameter method. The results show that the predictive accuracy of the long-term strength of Inconel 617 alloy is closely related to the data used in the LMP modeling. Compared with the modeling of all the experimental points in the range of 595-1905 ° C, the predictions of the durability values derived from the data below 900 ° C More consistent with the reference / true value. Further study of the microstructure shows that the reason for the above phenomena is related to the obvious change of the microstructure of the alloy in the high temperature range (900 ℃ and above), especially the type and amount of the strengthening phase. Therefore, when evaluating the long-term performance of such alloys, high temperature data should be used with caution to reduce the tendency for miscalculation of performance.