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- Tamura Manabu
- National Defense Academy
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- Haruguchi Yusaku
- Under Graduate School of National Defense Academy
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- Yamashita Masahiro
- Under Graduate School of National Defense Academy
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- Nagaoka Yoshikazu
- Under Graduate School of National Defense Academy
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- Ohinata Kensuke
- Under Graduate School of National Defense Academy
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- Ohnishi Kohtarou
- Under Graduate School of National Defense Academy
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- Itoh Eiki
- Under Graduate School of National Defense Academy
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- Ito Hiroyuki
- Naka Application Center, Hitachi High-Technologies Co.
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- Shinozuka Kei
- National Defense Academy
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- Esaka Hisao
- National Defense Academy
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抄録
Metallurgical observation of 9%Cr–1%Mo–0.2%V steel tempered at 750°C for a maximum of 100 h has been made. Accompanying the recovery of martensitic structure, discontinuous changes in hardness, intensity of an X-ray diffraction peak of the matrix, the lattice strain calculated from the integral width of an X-ray peak, the amount of extracted residue and the size of M23C6 were observed when tempering time is around 10 h. These changes are caused by the annihilation of dislocations and the coalescence of martensite lath followed by the formation of subgrains in the later stage of tempering, which is supported by electron back scattered pattern (EBSP) measurements. The ultra fine grains of the order of 0.1 μm were confirmed around martensite lath and block by EBSP, which is obviously correlated with the discontinuous changes in the hardness and the lattice strain. Precipitation of M23C6 on excess dislocations of martensite induces a larger amount of precipitates as compared with the thermal equilibrium, which causes the dissolution of M23C6 during consequent tempering. The dissolution of M23C6 results in slower growth rate as compared with the Ostwald ripening. The observed over-all time exponent is 1/16.
収録刊行物
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- ISIJ International
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ISIJ International 46 (11), 1693-1702, 2006
一般社団法人 日本鉄鋼協会
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詳細情報
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- CRID
- 1390001206489155456
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- NII論文ID
- 10018555498
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- NII書誌ID
- AA10680712
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- ISSN
- 13475460
- 09151559
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可