Effect of cobalt on the microstructure of tempered martensitic 9Cr steel for ultra-supercritical power plants
作者： L. Helis , Y. Toda , T. Hara , H. Miyazaki , F. Abe
DOI: 10.1016/J.MSEA.2008.04.131
关键词:
摘要: The effect of Co on the microstructure of advanced 9Cr–3W–0/5Co–0.2 V–0.05 Nb–0.08 C–0.05 N steel, designed for application at highly efficient ultra-supercritical power plants, has been systematically studied, using specimens containing 0%, 1%, 3% and 5% Co. Calculation by Thermo-Calc suggested and observation of microstructure after heat treatment confirmed the presence of about 6% and 0.4% of δ-ferrite in Co-free and 1% Co steel, respectively. Coarse primary Nb-rich MX particles preferentially form inside δ-ferrite …
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