CHARACTERISATION OF THE MICROSTRUCTURE EVOLUTION OF AGED GRADE 91 STEEL

被引：0

作者：

Che, Chang ^{[1
]}

Liu, Xiang ^{[1
]}

Huang, Youcliao ^{[2
]}

Pan, Qingchuan ^{[1
]}

Qian, Gong ^{[1
]}

机构：

[1] China Special Equipment Inspect & Res Inst, Beijing, Peoples R China

[2] Zhejiang Zheneng Lanxi Power Generat Co Ltd, Lanxi, Peoples R China

来源：

PROCEEDINGS OF THE ASME 2020 PRESSURE VESSELS & PIPING CONFERENCE (PVP2020), VOL 6 | 2020年

基金：

中国国家自然科学基金;

关键词：

Grade; 91; Microstructure; Quantitative assessment; CREEP;

D O I：

暂无

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Grade 91 steel has high creep strength and has been used as the material of piping in 600 degrees C USC power plants in China. The Grade 91 materials used in actual power plants are useful in estimating the changes of material properties caused by long-term aging and damage at low stress conditions. An understanding of the long-term microstructural evolution under actually used conditions is a key for the improvement of these heat resistant steels. In this article, microstructural evolution of Grade 91 steel under different service conditions in Chinese power plants was studied using optical microscope (OM), transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS) techniques. The results show, M23C6, MX (V-rich particles; Nb-rich particles), and Laves phases were found to precipitate. A quantitative characterisation of microstructure evolution was evaluated during long-term exposure, focusing on the size of precipitates (M23C6 carbides, Laves phase, MX phase) for the Grade 91 steel after long-term service.

引用

页数：6

共 11 条

[1] Precipitate design for creep strengthening of 9% Cr tempered martensitic steel for ultra-supercritical power plants [J].

Abe, Fujio .

SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS, 2008, 9 (01)

[2]

Cipolla L., 2005, CREEP FRACTURE HIGH, P288

[3] MICROSTRUCTURAL CHANGES IN A 12-PERCENT CHROMIUM STEEL DURING CREEP [J].

EGGELER, G ;

NILSVANG, N ;

ILSCHNER, B .

STEEL RESEARCH, 1987, 58 (02) :97-103

[4] Precipitate stability in creep resistant ferritic steels - Experimental investigations and modelling [J].

Hald, J ;

Korcakova, L .

ISIJ INTERNATIONAL, 2003, 43 (03) :420-427

[5]

Kimura K., 2000, 5 INT CHARL PARS TUR, P590

[6] On the effect of equal-channel angular pressing on creep of tempered martensite ferritic steels [J].

Kostka, A. ;

Tak, K. -G. ;

Eggeler, G. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2008, 481 (1-2 C) :723-726

[7]

Kushima H, 1999, TETSU TO HAGANE, V85, P841

[8]

[李玲霞 Li Lingxia], 2013, [冶金分析, Metallurgical Analysis], V33, P1

[9] Long-term creep behavior of 9-12%Cr power plant steels [J].

Sklenicka, V ;

Kucharová, K ;

Svoboda, M ;

Kloc, L ;

Bursik, J ;

Kroupa, A .

MATERIALS CHARACTERIZATION, 2003, 51 (01) :35-48

[10]

Strang A, 2003, P 6 INT C PARS TURB, P427

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