Effect of Nitrogen Content on Microstructural Aspects and Creep Behavior in Extremely low Carbon 9Cr Heat-resistant Steel
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概要
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Effects of nitrogen content on microstructure and creep strength in extremely low carbon 9Cr ferritic steel were investigated, focusing on the dislocation structure and the distribution of precipitates. The creep strength of the high nitrogen steels was lower than that of the base steel, even though the initial lath width and prior austenite grain size in the high nitrogen steels are finer and larger, respectively. MX nitrides as well as large Cr2N particles were distributed along lath, block, packet and prior austenite grain boundaries in the high nitrogen steels after tempering. The large particles occupy the MX nitride precipitation sites. The coarsening of the MX nitride during creep exposure in the high nitrogen steels was faster than that of the base steel. The presence of large Cr2N particles after tempering and the higher coarsening rate of the MX nitride in the high nitrogen steels cause an increase in mean inter-particle spacing on boundaries, leading to a decrease in creep strength. The Z phase formation was observed after creep exposure in the gauge portion of all the steels. The Z phase formation in the high nitrogen steels occurs at relatively short term in contrast to the base steel. The short term precipitation of the Z phase in high nitrogen steels can contribute to a decrease in creep strength since the Z phase forms at the expense of the MX nitride which is a main strengthening obstacle.
- 社団法人 日本鉄鋼協会の論文
- 2004-07-15
著者
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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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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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SAWADA Kota
National Research Institute for Metals
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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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Sawada Kota
Materials Reliability Center National Institute For Materials Science
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Sawada Kota
Materials Information Technology Station National Institute For Materials Science
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TANEIKE Masaki
Steel Research Center, National Institute for Materials Science
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Taneike Masaki
Steel Research Center National Institute For Materials Science
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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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