Evaluation of creep-fatigue life based on fracture energy for modified 9Cr-1Mo steel

被引：13
|
作者：
Nagae, Yuji [1 ]
机构：
[1] Japan Atom Energy Agcy 4002, Struct Mat Res Grp, Oarai, Ibaraki 3111393, Japan
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2013年 / 560卷
关键词：
Martensite; Long-term life; Extrapolation; Creep; Fatigue; Fracture energy; TEMPERATURE; BEHAVIOR;
D O I：
10.1016/j.msea.2012.10.029
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Preventing creep-fatigue damage is a major consideration in nuclear power plants, which operate at high temperatures. Energy absorbed during creep-fatigue loading is focused on for predicting long-term creep-fatigue life for modified 9Cr-1Mo steel. Fracture energy decreases with time owing to creep deformation localization. Change in fracture energy is described by a power law function of hysteresis energy density rate and time to fracture. Hysteresis energy density is approximately expressed as a function of the total strain range. Then, hysteresis energy density rate is determined by dividing hysteresis energy density by time per cycle. The function gives a good fit of data for creep-fatigue and low strain-rate fatigue. The creep-fatigue life can be predicted using the power law function. According to microstructure observation, change in fracture energy is due to annihilation of block and packet boundary. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：752 / 758
页数：7
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