Microstructure-Based Creep Life Assessment of 1CrMoV Turbine Rotor Steels After Long-Term Service

被引：0
|
作者：
Nyembe, Hlanganani Siphelele [1 ]
van der Meer, Philip [2 ]
Knutsen, Robert [2 ,3 ]
Westraadt, Johan Ewald [1 ]
机构：
[1] Nelson Mandela Univ, Ctr HRTEM, Dept Phys, Gqeberha, South Africa
[2] Univ Cape Town, Ctr Mat Engn, Dept Mech Engn, Cape Town, South Africa
[3] Univ Cape Town, Electron Microscope Unit, Cape Town, South Africa
来源：
JOURNAL OF FAILURE ANALYSIS AND PREVENTION | 2024年 / 24卷 / 02期
基金：
新加坡国家研究基金会;
关键词：
Microstructure; Electron microscopy; Creep life exhaustion; Long-term service; 1CrMoV steel rotor; CR-MO-V; MECHANICAL-PROPERTIES; EVOLUTION; DAMAGE; PRECIPITATION; CARBIDES; BEHAVIOR;
D O I：
10.1007/s11668-024-01858-1
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This study evaluates the use of quantitative analytical electron microscopy for microstructure-based creep life assessment of service-exposed 1CrMoV steel turbine rotors. Changes in the microstructure (bainitic laths, carbide phases) were related to creep life exhaustion estimations done using conventional methods based on cavities and hardness. The volume-weighted average size and surface density of bainitic laths correlate with cavity-based estimated creep life exhaustion. However, the heterogeneity of grain structure limits the use of bainitic lath parameters for assessing creep life based on microstructure. The phase proportions of M3C, M2C, and M7C3 carbides, as determined by TKD-EDS mapping, show a strong correlation (R2: 0.64, 0.61, and 0.86) with creep life exhaustion estimations and could potentially be used as an additional indicator of the material state of the critical failure region in 1CrMoV turbine rotors.
引用
收藏
页码：559 / 574
页数：16
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