Rev. Met. Paris
Volume 103, Number 5, May 2006Énergie
|Page(s)||247 - 256|
|Published online||14 June 2006|
Long-term stabilization of creep-resistant 9Cr steel by boron for high efficient, low emission power plant at 650 °C
With increasing boron content, the coarsening rate of M23C6 carbides becomes reduced near grain boundaries in tempered martensitic 9Cr-3W-3Co-VNb steel during creep at 650 °C. This retards the recovery of martensitic microstructure up to long times and increases long-term creep strength. However, excess addition of boron and nitrogen causes the formation of large amount of massive boron-nitrides during normalizing at 1050-1150 °C, which significantly decreases the boron concentration available for microstructure stabilization and degrades the creep strength.
© La Revue de Métallurgie, 2006
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