Effect of W and Mo contents on the microstructural evolution and properties in the 9% Cr martensitic rotor steel during long-term aging at 630 °C

被引:5
作者
Qiu, Jiajia [1 ,2 ]
He, Xikou [1 ]
Liu, Zhengdong [1 ]
Tang, Zhengxin [1 ]
Wang, Xitao [2 ]
He, Jinshan [2 ]
机构
[1] Cent Iron & Steel Res Inst Co Ltd CISRI, Inst Special Steels, Beijing 100081, Peoples R China
[2] Univ Sci & Technol Beijing, Collaborat Innovat Ctr Steel Technol, Beijing 100083, Peoples R China
来源
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2024年 / 32卷
关键词
9% Cr martensitic rotor steel; W and Mo elements; Laves phase; M; 23; C; 6; carbides; Yield strength; HEAT-RESISTANT STEEL; LAVES-PHASE; MECHANICAL-PROPERTIES; DISLOCATION DENSITY; MX CARBONITRIDES; LATH MARTENSITE; YIELD STRENGTH; FERRITIC STEEL; G115; STEEL; CREEP;
D O I
10.1016/j.jmrt.2024.07.069
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The evolution of tensile properties and microstructure in three 9% Cr martensitic rotor steel with varying contents of W and Mo elements is investigated after aging at 630 degrees C for different durations, with a primary focus on the characteristics of martensite laths and blocks, grain boundaries, dislocations, and precipitates. The results indicate that the presence of W and Mo elements not only influences the precipitation and coarsening behavior of Laves phases but also that of M23C6 carbides, which differs from conventional beliefs. The elevated content of Mo and reduced content of W in the steel leads to a reduction in the equilibrium Cr concentration, promoting enhanced precipitation of Cr atoms and increases nucleation sites of M23C6 carbides. During the aging treatment, the M23C6 carbides in the 2.0W0.5Mo steel exhibits the highest content and the lowest coarsening rate. The strength of 9% Cr martensitic rotor steel is primarily enhanced through dislocation strengthening and grain boundary strengthening. The presence of fine M23C6 carbides effectively immobilizes dislocations and interfaces, resulting in the exceptional stability of the microstructure in the 2.0W0.5Mo steel and a minimal reduction in yield strength.
引用
收藏
页码:152 / 164
页数:13
相关论文
共 45 条
[1]  
Abe F, 2008, INT J MATER RES, V99, P387, DOI 10.3139/146.101650
[2]   Effect of W-Mo balance on long-term creep life of 9Cr steel [J].
Abe, Fujio ;
Ohba, Toshio ;
Miyazaki, Hideko ;
Toda, Yoshiaki ;
Tabuchi, Masaaki .
MATERIALS AT HIGH TEMPERATURES, 2019, 36 (04) :314-324
[3]   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)
[4]  
Argon A.S., 1971, PHYS TODAY, V24, P60, DOI 10.1063/1.3022886
[5]   Microstructure Evolution and Pinning of Boundaries by Precipitates in a 9 pct Cr Heat Resistant Steel During Creep [J].
Dudko, Valeriy ;
Belyakov, Andrey ;
Molodov, Dmitri ;
Kaibyshev, Rustam .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2013, 44A :162-172
[6]   Laves-phase precipitates in a low-carbon 9% Cr martensitic steel during aging and creep at 923 K [J].
Fedorova, I. ;
Belyakov, A. ;
Kozlov, P. ;
Skorobogatykh, V. ;
Shenkova, I. ;
Kaibyshev, R. .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2014, 615 :153-163
[7]   Effect of Alloying on the Nucleation and Growth of Laves Phase in the 9-10%Cr-3%Co Martensitic Steels during Creep [J].
Fedoseeva, Alexandra ;
Nikitin, Ivan ;
Tkachev, Evgeniy ;
Mishnev, Roman ;
Dudova, Nadezhda ;
Kaibyshev, Rustam .
METALS, 2021, 11 (01) :1-19
[8]   A model for the microstructure behaviour and strength evolution in lath martensite [J].
Galindo-Nava, E. I. ;
Rivera-Diaz-del-Castillo, P. E. J. .
ACTA MATERIALIA, 2015, 98 :81-93
[9]   Precipitates and Particles Coarsening of 9Cr-1.7W-0.4Mo-Co Ferritic Heat-Resistant Steel after Isothermal Aging [J].
Gao, Qiuzhi ;
Zhang, Yanan ;
Zhang, Hailian ;
Li, Huijun ;
Qu, Fu ;
Han, Jian ;
Lu, Cheng ;
Wu, Bintao ;
Lu, Yao ;
Ma, Yan .
SCIENTIFIC REPORTS, 2017, 7
[10]   STRENGTHENING MECHANISMS IN HIGH-STRENGTH MICROALLOYED STEELS [J].
GAWNE, DT ;
LEWIS, GMH .
MATERIALS SCIENCE AND TECHNOLOGY, 1985, 1 (03) :183-191