Influence of Phosphorus on Solidification Structure in Continuously Cast 0.1 mass% Carbon Steel.
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- Yoshida Naotsugu
- Steel Research Center, National Institute for Materials Science
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- Umezawa Osamu
- Department of Mechanical Engineering and Materials Science, Yokohama National University
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- Nagai Kotobu
- Steel Research Center, National Institute for Materials Science
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In 0.1 mass% carbon steels with phosphorus contents ranging from 0.01 to 0.2 mass%, slabs were continuously cast to a thickness of 100 mm with a laboratory scale caster. Their macro- and micro-structures were characterized, focusing on the effects of phosphorus addition on the structural evolution during solidi-fication and subsequent cooling. Cast slabs of high phosphorus steels have a fine columnar-γ-grain structure. The mean width of the columnar grain was approximately half of that in the cast slabs without the phosphorus addition. Dispersed globular α grains were observed in the α grain structure of high phosphorus steels. The globular grains evolved at the phosphorus-rich spots in the prior-γ grain. The micro-segregation of phosphorus results in these structural evolutions. Since the phosphorus enrichment stabilizes bcc (δ or α) phase locally at the inter-dendritic region, the phosphorus-rich spot makes δ phase retained to lower temperature for the δ/γ transformation, and provides a predominant site for the γ/α transformation. In the high phosphorus casts, therefore, the dispersed δ phase are thought to pin the γ grain growth more effectively in the δ+γ region when the completion of the δ/γ transformation is remarkably suppressed by the phosphorus segregation.
収録刊行物
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- ISIJ International
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ISIJ International 43 (3), 348-357, 2003
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
- 1390282681428069888
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- NII論文ID
- 10014446706
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- NII書誌ID
- AA10680712
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- COI
- 1:CAS:528:DC%2BD3sXitlKrtLs%3D
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- ISSN
- 13475460
- 09151559
- http://id.crossref.org/issn/00211583
- http://id.crossref.org/issn/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