Improvement in Creep Strength of Precipitation Strengthened 15Cr Ferritic Steel by Controlling Carbon and Nitrogen Contents
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概要
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The effects of carbon and nitrogen on the creep strength and microstructure of precipitation-strengthened 15Cr ferritic steel have been investigated. The creep rupture lives of 15Cr ferritic steel with the addition of 0.07 mass%N and with a combination of 0.05 mass%C and 0.03 mass%N were extended longer than that of the conventional ferritic creep resistant steel of ASME T92. However, excess addition of carbon and nitrogen resulted in a decrease in long-term creep strength. For the steel with 0.07 mass%N addition, which showed excellent long-term creep strength, many plate-shaped fine precipitates and a few coarse block-type ones were observed. The volume fraction of precipitate free zone in this steel was smaller, and the coarsening rate of the fine precipitates identified as intermetallic compounds in this steel was lower than that of the other steels. The long-term creep strength of the present steel was improved by the addition of 0.07 mass%N through the precipitation strengthening effect of many uniformly distributed stable fine particles.
- 社団法人日本機械学会の論文
- 2005-01-15
著者
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Abe Fujio
Steel Research Center National Institute For Materials Seienee
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Abe F
National Institute For Materials Science
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KIMURA Kazuhiro
National Institute for Materials Science
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ABE Fujio
National Institute for Materials Science
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TODA Yoshiaki
Steel Research Center, National Institute for Materials Science
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KUSHIMA Hideaki
Materials Information Technology Station, National Institute for Materials Science
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KIMURA Kazuhiro
Materials Information Technology Station, National Institute for Materials Science
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TOHYAMA Hideaki
Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
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Toda Yoshiaki
National Institute for Materials Science
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Abe F
Steel Research Center National Institute For Materials Seienee
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Abe Fujio
National Institute Of Materials Science
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Abe Fujio
Frontier Research Center For Structural Materials National Research Institute For Metals
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Abe Fujio
Steel Research Center (src) National Institute For Materials Science
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Toda Yoshiaki
Steel Research Center National Institute For Materials Seienee
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Kimura Kazuhiro
Materials Data Sheet Station National Institute For Materials Science
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Abe Fujio
Structural Metals Center National Institute For Materials Science
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Kushima Hideaki
Materials Data Sheet Station National Institute For Materials Science
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Kushima Hideaki
Materials Information Technology Station National Institute For Materials Science
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Tohyama Hideaki
Interdisciplinary Graduate School Of Science And Engineering Tokyo Institute Of Technology:(present
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Abe Fujio
Steel Research Center National Institute For Materials Science
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Abe Fujio
Tsukuba Laboratories National Research Institute For Metals
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Kimura Kazuhiro
National Research Institute For Metals
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