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Long-term stabilization of creep-resistant 9Cr steel by boron forhigh efficient, low emission power plant at 650 °C

Published online by Cambridge University Press:  14 June 2006

Fujio Abe
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Abstract

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.

Type
Research Article
Information
Metallurgical Research & Technology , Volume 103 , Issue 5: ÉnergieFour électriqueRevêtementUltra steels , May 2006 , pp. 247 - 256
Copyright
© La Revue de Métallurgie, 2006

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