Precipitation Behavior of σ Phase in Ultra-Supercritical Boiler Applied HR3C Heat-Resistant Steel

被引：14
|
作者：
Cao, Tie-Shan [1 ,2 ]
Cheng, Cong-Qian [1 ]
Zhao, Jie [1 ]
Wang, Hui [1 ]
机构：
[1] Dalian Univ Technol, Sch Mat Sci & Engn, Dalian 116024, Peoples R China
[2] Dalian Univ Technol, State Key Lab Struct Anal Ind Equipment, Dalian 116024, Peoples R China
来源：
ACTA METALLURGICA SINICA-ENGLISH LETTERS | 2019年 / 32卷 / 11期
基金：
国家高技术研究发展计划(863计划); 中国国家自然科学基金;
关键词：
Heat-resistant steel; Aging precipitation; sigma Phase; TTT curve; 700; DEGREES-C; MECHANICAL-PROPERTIES; MICROSTRUCTURAL EVOLUTION; AUSTENITIC STEEL;
D O I：
10.1007/s40195-019-00878-3
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The precipitation kinetics of sigma phase in commercial HR3C heat-resistant steel during aging at 650-800 degrees C was studied in the paper. Through morphology, composition and structural analyzing on the second phase in the HR3C steel, it was confirmed that the precipitations after aging were mainly NbCrN, M23C6 and FeCr type sigma phase. The time-dependent mass change of the three precipitated phases showed that the linearly increased sigma phase after aging at 750 degrees C-2000 h was transformed from NbCrN phase or M23C6 phase. According to the calculation on the volume fraction of electrolytically dyed sigma phase, the time-temperature transformation (TTT) curve for sigma phase at 1 vol% in two kinds of commercial HR3C steel (different in grain size) was obtained and analyzed. The nose of the TTT curve was located at around 750 degrees C for the two kinds of HR3C steel, and the larger grain size HR3C steel displayed a inhibit effect on the precipitation of sigma phase. The impact energy of the HR3C steel after aging at 700 degrees C decreased obviously with the fracture mechanism changing from ductile fracture to intergranular brittle fracture, which was considered to be related to the density of sigma-brittle phase after aging.
引用
收藏
页码：1355 / 1361
页数：7
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