Laves Phase Formation and Its Effect on Mechanical Properties in P91 Steel

Effect of Laves phase formation on mechanical properties in a pressurized T-junction of P91 steel pipe at849 K for 58,000 h with 25.65 MPa vapor pressure was studied. Thermodynamic calculations had been performed by using the software Thermo-Calc to study the phase at equilibrium state. Counter plot...

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Bibliographic Details
Published in:Acta metallurgica sinica : English letters 2015-10, Vol.28 (10), p.1238-1246
Main Authors: Xia, Zhi-Xin, Wang, Chuan-Yang, Zhao, Yan-Fen, Zhang, Guo-Dong, Zhang, Lu, Meng, Xin-Ming
Format: Article
Language:English
Subjects:
Boundary conditions
Characterization and Evaluation of Materials
Chemistry and Materials Science
Chromium molybdenum steels
Corrosion and Coatings
Crack initiation
Ferritic stainless steels
Finite element analysis
Finite element method
Formations
Grain boundaries
Heat resistant steels
Impact tests
Laves phase
Laves相
Martensite
Materials Science
Mathematical analysis
Mechanical properties
Metallic Materials
Molybdenum
Nanotechnology
Organometallic Chemistry
P91钢管
Pipe
Service life
Solid solutions
Spectroscopy/Spectrometry
Steel pipes
Steels
Stress distribution
Stresses
Tensile properties
Tribology
Vapor pressure
冲击能量
力学性能
平均尺寸
应力分布
热力学计算
裂纹扩展
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Summary:Effect of Laves phase formation on mechanical properties in a pressurized T-junction of P91 steel pipe at849 K for 58,000 h with 25.65 MPa vapor pressure was studied. Thermodynamic calculations had been performed by using the software Thermo-Calc to study the phase at equilibrium state. Counter plot of von Mises stress in the pipe during service life was calculated by finite element analysis to study the effect of the operated stress distribution on the evolution of Laves phase. The change in the microstructure and mechanical properties in the sites with different stress was also studied. The results indicated that the formation of Laves phase in P91 steel was a thermodynamically possible process due to enrichment of Mo and depletion of C adjacent to M23C6 particles or along martensite lath and packet boundaries. The formation of Laves phase had a detrimental influence on the mechanical properties in P91 steel. The mean size of Laves phase would be significantly increased with increasing operated stress, leading to a reduction in tensile properties and impact energy. In particular, crack initiation energy and crack growth energy during impact test rapidly decreased with increasing the mean size and volume fraction of Laves phase.
ISSN:1006-7191
2194-1289
DOI:10.1007/s40195-015-0318-5