利用Z参数方法分析了T91/P91(9Cr-1Mo-V-Nb)钢高温持久性能数据的统计分布规律.结果表明:形状、热处理工艺等不同的T91/Pg1钢的高温持久性能数据交替重叠地分布在以应力σ-TTP(时间-温度参数)关系主曲线为中心的数据带中,而表征T91/P91钢持久性能数据分散性的Z参数服从正态分布.基于Z参数法对材料高温持久性能的可靠性分析结果,提出了T91/P91钢的σ-TTP-可靠度R曲线、σ-断裂时间tr-R曲线和许用应力[σ]-温度T-R曲线.预测结果与NmM及ECCC公开的实验数据均符合良好.
Life Drediction is an important issue for components serviced at high temperature from both economic and safety reasons.For the purpose to correlate creep rupture data,the timetemperature parameter(TTP)method is often used to condense all the rupture data obtained at various stresses and temperatures to a narrow band.Because of uncertainty factors in materials and experiment conditions,creep rupture data generally exhibit dispersity which can be described using a so-called Z-parameter method.The current Paper performs a statistical analysis for creep rupture data of T91/P91(9Cr-1Mo-V-Nb)steel,a kind of ferritic steels widely used in power plants recently by Z-parameter method.The results indicate that all the creep rupture data distribute in a narrow band in stress σ-TTP plot.The distribution of Z-parameter which iS used to represent the dispersion of the creep rupture data follows normal distribution.σ-TTP-reliability R,σ-rupture time tr-R and allowable stress [σ]-temperature T-R curves are proposed based on Z-parameter method.The results exhibit a good agreement with the experimental data promulgated by NRIM and ECCC.
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