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Effects of Cr Addition on Coarse Columnar Austenite Structure in As-Cast 0.2 mass% Carbon Steel

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ISIJ Int. 50(12)_ 1959-1964 (2010).pdf2.84 MBPDFView/Open
Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/75408

Title: Effects of Cr Addition on Coarse Columnar Austenite Structure in As-Cast 0.2 mass% Carbon Steel
Authors: Tsuchiya, Shingo Browse this author
Ohno, Munekazu Browse this author →KAKEN DB
Matsuura, Kiyotaka Browse this author →KAKEN DB
Isobe, Kohichi Browse this author
Keywords: carbon steel
solidification
peritectic transformation
austenite grain
columnar structure
chromium
phosphorous
segregation
grain growth
Issue Date: 15-Dec-2010
Publisher: Iron and Steel Institute of Japan
Journal Title: ISIJ International
Volume: 50
Issue: 12
Start Page: 1959
End Page: 1964
Publisher DOI: 10.2355/isijinternational.50.1959
Abstract: Effects of Cr addition on as-cast Coarse Columnar austenite Grain (CCG) structure were investigated for 0.2 mass% carbon steel by means of rapid unidirectional solidification method which realizes cooling conditions similar to those in the vicinity of continuous cast slab surface. Although the as-cast structure of the unidirectionally solidified samples always consisted of the CCGs regardless of Cr addition, the aspect ratio of the CCGs was remarkably reduced by the Cr addition. During solidification, Fine Columnar austenite Grains (FCGs) existed at the growing front of the CCG region and the migration velocity of the FCG/CCG boundary was reduced by the Cr addition. EPMA analysis revealed that the Cr addition enhances P segregation at interdendritic positions, which lowers a temperature for completion of γ transformation, Tγ. This lowered Tγ reduces the migration velocity of the FCG/CCG boundary and, as a result, induces the formation of CCGs having shorter major axis diameters.
Rights: 著作権は日本鉄鋼協会にある
Type: article
URI: http://hdl.handle.net/2115/75408
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大野 宗一

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