T91/P91钢持久性能的统计分析及可靠性预测  

STATISTICAL ANALYSIS AND RELIABILITY PREDICTION OF CREEP RUPTURE PROPERTY FOR T91/P91 STEEL

作　　者：赵杰[1] 李东明[1] 方园园[1] 

机构地区：[1]大连理工大学材料学院,大连116085

出　　处：《金属学报》2009年第7期835-839,共5页Acta Metallurgica Sinica

基　　金：国家高技术研究发展计划资助项目2006AA04Z421~~

摘　　要：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/P91钢的高温持久性能数据交替重叠地分布在以应力σTTP(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NRIM及ECCC公开的实验数据均符合良好.Life prediction 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 time- temperature 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.

关 键 词：9Cr-1Mo—V—Nb钢 持久性能 可靠性预测 耐热钢 

分 类 号：TG115.5[金属学及工艺—物理冶金]