Microstructural Evolution during Greep Test in 9Cr-2W-V-Ta Steels and 9Cr-1Mo-V-Nb Steels
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概要
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In order to clarify the mechanism of remarkable creep strength of the 9Cr–2W–0.2V–Ta steels, high-Cr heat-resistant steels with Mo replaced by W and Nb by Ta for reducing induced radioactivity, the microstructural evolution during creep tests has been studied and compared with that in conventional 9Cr–1Mo–0.2V–Nb steels. Particular attention was called to quantitative analysis of solute W and Mo contents evaluated with the EDX spectra measured with the thin foil in the FE-TEM analysis.It has been supposed that the martensitic microstructure and fine MX-type precipitates have no significant effect on the difference in creep properties between the W-containing steel and the Mo-containing steel.Moreover the creep strength of the W-containing steel can not be attributed to the larger solid solution hardening by W. Mo distribution may encourage creep strain localization in solid solution, which results in the deterioration of creep strength of Mo-containing steels. Comparing M23C6 and Laves phase, the latter is assumed to be the main governing factor.
- 社団法人 日本鉄鋼協会の論文
- 2001-08-15
著者
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阿部 義男
新日本製鐵(株)特別基礎第二研究センター
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Sugiyama Masaaki
Advanced Materials & Technology Research Laboratories Nippon Steel Corporation
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MARUYAMA Naoki
Advanced Technology Research Laboratories
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Abe Yoshio
Steel Research Laboratories Nippon Steel Corporation
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HASEGAWA Toshiei
Oita R & D Laboratory, Nippon Steel Corporation
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TOMITA Yukio
Steel Research Laboratories, Nippon Steel Corporation
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Hasegawa Toshiei
Oita R & D Laboratory Nippon Steel Corporation
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Maruyama Naoki
Advanced Technology Research Laboratories Nippon Steel Corporation
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Tomita Yukio
Steel Research Laboratories Nippon Steel Corporation
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