Effect of Molybdenum Content on the Hardenability and Precipitation Behaviors of Boron Steel Austenitized at High Temperatures
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- Ishikawa Kyohei
- Steel Research Laboratories, Nippon Steel Corporation Graduate School of Natural Science and Technology, Kanazawa University
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- Fujioka Masaaki
- Steel Research Laboratories, Nippon Steel Corporation
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- Hoshino Manabu
- Nagoya Office, Nippon Steel Technology Co.,Ltd.
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- Takahashi Jun
- Advanced Technology Research Laboratories, Nippon Steel Corporation
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- Homma Ryuichi
- East Nippon R&D Laboratories, Nippon Steel Corporation
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- Ushioda Kohsaku
- Graduate School of Natural Science and Technology, Kanazawa University
抄録
<p>The effect of molybdenum (Mo) contents on hardenability and precipitation behaviors in Mo–B simultaneously added steels were investigated placing a focus on high austenitizing temperature. The hardenability of 0.5% Mo - 11 ppm B steel austenitized at 1150°C was decreased compared with that austenitized at 950°C, whereas 1.0% Mo - 10 ppm B and 1.5% Mo - 9 ppm B steels were less affected by high austenitizing temperature than 0.5% Mo - 11 ppm B steel. The Fe23(C, B)6 precipitation by increasing austenitizing temperature was also revealed to be suppressed in 1.5% Mo – 9 ppm B steel. These results indicate that the improved effect of the Mo addition on hardenability by retarding the precipitation of Fe23(C, B)6 still appear in B-added steels austenitized at high temperature. Furthermore, Fe23(C, B)6 precipitation start temperature was increased in Mo–B added steels austenitized at 1150°C. This result implies that non-equilibrium B segregation mechanism during cooling from high austenitizing temperature enhances the amount of segregated B on grain boundaries leading to the promotion of the borides precipitation at high austenitizing temperature region. However, Mo is presumed to fix a part of thermal vacancies as Mo–V complex resulting in the suppression of non-equilibrium B segregation to grain boundaries during cooling, which is speculated to inhibit the Fe23(C, B)6 precipitation. Thus, the effect of Mo–B combined addition on hardenability was presumably maintained even in high austenitizing temperature region.</p>
収録刊行物
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- ISIJ International
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ISIJ International 64 (5), 847-858, 2024-03-15
一般社団法人 日本鉄鋼協会
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詳細情報 詳細情報について
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- CRID
- 1390580947974846080
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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
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- 抄録ライセンスフラグ
- 使用不可