Effect of Carbon, Nitrogen and Nickel on Long-term Creep Rupture Strength of 10 Cr Steels Containing Boron
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- Arai Masahiko
- Material Research Laboratory, Hitachi, Ltd.
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- Asakura Kentaro
- Graduate School of Engineering, The University of Tokyo
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- Doi Hiroyuki
- Power Sysytems Company, Hitachi, Ltd.
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- Kawanaka Hirotsugu
- Material Research Laboratory, Hitachi, Ltd.
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- Koseki Toshihiko
- Graduate School of Engineering, The University of Tokyo
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- Horiuchi Toshiaki
- Department of Mechanical Systems Engineering, Faculty of Advanced Engineering, Hokkaido Institute of Technology
Bibliographic Information
- Other Title
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- ボロン含有10Cr系耐熱鋼の長時間クリープ破断強度に及ぼすC,NおよびNiの効果
- ボロン ガンユウ 10Crケイ タイネツ コウ ノ チョウジカン クリープハダンキョウド ニ オヨボス C N オヨビ Ni ノ コウカ
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Abstract
Microstructure and precipitates of creep ruptured specimens were investigated in order to understand the effects of carbon (C), nitrogen (N) and nickel (Ni) on long-term creep rupture strength of 10Cr heat-resistant steels containing boron (B). The low-N steels showed higher creep rupture strength than the high-N steels. In long-term creep rupture region such as over 10,000 h at 650°C, the deterioration of creep rupture strength was not observed in the low-N, high-C steel. On the other hand, the creep rupture strength of the low-N, low-C steel dropped to the strength level of the high-N steels. The addition of N to the B containing steels promoted the recovery of microstructure. The formation of coarse BN in the high-N steels led to the decrease of the amount of effective B that dissolved in M23(C,B)6 and suppressed its coarsening. From EDS analysis of precipitates, the fraction of M23C6 in the low-C steels was less than that in the high-C steels, while the fraction of coarse Laves phase in the low-C steels was more than that in the high-C steels. In the low-N, low-C steel, the coarsening of precipitates caused the deterioration of the creep rupture strength after 10,000 h exposure. Ni lowered Ac1 and Ac3 transition temperature, but it did not affect the fraction of precipitates according to the calculation of thermodynamic equilibrium using Thermo-Calc. It is concluded that C and N are more effective to the stability of microstructure than Ni.
Journal
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- Tetsu-to-Hagane
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Tetsu-to-Hagane 97 (5), 295-304, 2011
The Iron and Steel Institute of Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390001205127779968
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- NII Article ID
- 130000673798
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- NII Book ID
- AN10528571
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- ISSN
- 1341688X
- 18832954
- 00211575
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- NDL BIB ID
- 11111289
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed