Quantification of Laves phase particle size in 9CrW steel

Tungsten-alloyed martensic 9Cr steels are applied for streamlines of advanced power plants because of their superior creep performance. Tungsten, as the main new alloying element, induces precipitation of intermetallic Laves phase during long-term exposure at service temperatures around 600 °C. The...

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Bibliographic Details
Published in:Materials characterization 2001-08, Vol.47 (2), p.111-117
Main Authors: Korcakova, Leona, Hald, John, Somers, Marcel A.J
Format: Article
Language:English
Subjects:
Applied sciences
Creep
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
FEGSEM
Laves phase
Materials science
Mean particle diameter
Metals. Metallurgy
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Precipitation
Solid-phase precipitation
Tungsten alloyed steels
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Summary:Tungsten-alloyed martensic 9Cr steels are applied for streamlines of advanced power plants because of their superior creep performance. Tungsten, as the main new alloying element, induces precipitation of intermetallic Laves phase during long-term exposure at service temperatures around 600 °C. The growth and coarsening of Laves phase was investigated for the martensitic 9CrW steel P92 after aging and after creep testing at 600 or 650 °C for times up to 59,000 h. For measurement of the size of Laves phase particles, field emission gun scanning electron microscopy (FEGSEM) was used along with image analysis. This technique allows discrimination of Laves phase particles from M 23C 6 carbides. The measured particle sizes were statistically evaluated and compared with values obtained using energy-filtered transmission electron microscopy (EFTEM).
ISSN:1044-5803
1873-4189
DOI:10.1016/S1044-5803(01)00159-0