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常规时间-温度参数法(TTP),如Larson-Miller Parameter(LMP)参数法以及Orr-Sherby-Dorn(OSD)方法对9%—12%Cr铁素体耐热钢进行持久性能预测时存在性能过估,且预测值与实测值之间存在明显差异,本文提出了LMP的分区及其C值优化,以及基于短时实验数据((?)5×10~3h)预测长时(5×10~3—1×10~5h)持久性能的方法.利用已有的持久性能数据,应用所提出的方法进行了应力与持久断裂时间及其相关参量的计算、作图及其比较.结果表明,单区LMP方法的C值随钢种而异;多区LMP方法的C值随钢种及实验应力区而异;基于短时实验数据((?)5×10~3h)预测长时(5×10~3—1×10~5 h)持久性能的预测值与实测值吻合;d[g(σ)]/d(P)随P的变化率可反映不同钢种持久性能的稳定性;LMP分区法及预测函数优化法的计算值与实测值的吻合性很好并进一步克服了利用给定温度下短时持久实验数据外推长时持久性能的过估倾向.
Performance exists when using conventional time-temperature method (TTP), such as the Larson-Miller Parameter (LMP) parameter method, and the Orr-Sherby-Dorn (OSD) method for the prediction of the ductility of 9% -12% Cr ferritic heat- The results show that there is a significant difference between the predicted value and the measured value. In this paper, we propose the partitioning of LMP and its C value optimization, as well as the prediction of long time (5 × 10 5) based on the short-time experimental data (5 × 10-3 h) ~ 3-1 × 10 ~ 5h) .According to the existing long-term performance data, the calculation, plotting and comparison of stress and long-term fracture time and their related parameters are carried out by using the proposed method. The value of C in single-zone LMP method varies with the type of steel. The value of C in multi-zone LMP method varies with the type of steel and the experimental stress zone. Based on the short-term experimental data (5 × 10-3 h) × 10 ~ 3-1 × 10 ~ 5 h). The predictive value of long-term performance agrees with the measured value. The change rate of d [g (σ)] / d (P) with P can reflect the stability of long- The calculated values of the LMP partitioning method and the prediction function optimization method are in good agreement with the measured values and further overcome the over-estimation tendency of extrapolating long-term performance with short-term and long-term experimental data at a given temperature.