中文摘要：

建立了电站锅炉T91钢管蠕变断裂寿命计算模型，定量分析了蒸汽侧管壁温度和等效应力对T91受热管蠕变断裂寿命的影响，并对不同热负荷、不同尺寸受热管的计算结果进行了比较．结果表明：蒸汽侧氧化膜导致管壁温度升高是缩短部件蠕变断裂寿命的主要原因，等效应力增大是次要原因；受热管的蠕变断裂寿命随蒸汽侧氧化膜厚度的增加呈抛物线缩短；随管子热负荷的增加，蒸汽侧氧化膜对受热管蠕变断裂寿命的影响程度加剧；蒸汽侧氧化膜对外径较小的厚壁管子蠕变断裂寿命的影响较大．

英文摘要：

A calculation model was built up for the creep rupture life of T91 steel tubes, with which the effects of steam-side oxide scale on the creep rupture life were analyzed quantitatively from the aspects of temperature and equivalent stress, while a comparison made to the calculation results obtained under different conditions of heat flux and tube size. Results show that the increase of metal temperature resulted from steam-side oxide scale is the main cause of creep rupture life reduction, and the rise of equivalent stress is the secondary one; a parabolic relationship exists between the reduction of creep rupture life and the thickness of steam-side oxide scale; the effect of steam-side oxide scale on the creep rupture life intensifies with the rise of heat flux; the steam-side oxide scale has greater influence on creep rupture life of tubes with smaller outside diameter but larger wall thickness.