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Suppression of Coarse Columnar Grain Formation in As-cast Austenite Structure of a Hyperperitectic Carbon Steel by Nb Addition

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ISIJ Int. 51(11)_ 1831-1837 (2011).pdf1.29 MBPDFView/Open
Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/75399

Title: Suppression of Coarse Columnar Grain Formation in As-cast Austenite Structure of a Hyperperitectic Carbon Steel by Nb Addition
Authors: Ohno, Munekazu Browse this author →KAKEN DB
Yamaguchi, Tetsuya Browse this author
Matsuura, Kiyotaka Browse this author →KAKEN DB
Isobe, Kohichi Browse this author
Keywords: solidification
casting
peritectic steel
pinning
grain refinement
austenite grain structure
columnar grain
Issue Date: Nov-2011
Publisher: Iron and Steel Institute of Japan
Journal Title: ISIJ International
Volume: 51
Issue: 11
Start Page: 1831
End Page: 1837
Publisher DOI: 10.2355/isijinternational.51.1831
Abstract: Effects of Nb addition on as-cast γ-austenite grain structure in 0.2 mass% carbon steel are investigated by means of furnace cooling and permanent mold casting experiments. In the furnace-cooled samples with Nb addition, Nb(C,N) particles crystallize from the last-solidifying liquid in non-equilibrium solidification condition and they act as pinning particles for γ grain growth just after the solidification completion. The Nb addition produces a strong pinning effect on the as-cast γ grain structure. In the permanent mold casting experiment, Coarse Columnar Grains (CCG) structure develops from the mold wall in the sample without Nb. The increase in Nb concentration gradually decreases the fraction of CCG region and increases the fraction of Fine Columnar Grains (FCG), thus leading to the grain refinement. This refinement could be ascribed to the pinning effect of Nb(C,N) particles.
Rights: 著作権は日本鉄鋼協会にある
Type: article
URI: http://hdl.handle.net/2115/75399
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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