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

Ohno, Munekazu; Yamaguchi, Tetsuya; Matsuura, Kiyotaka; Isobe, Kohichi

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

Ohno, Munekazu; Yamaguchi, Tetsuya; Matsuura, Kiyotaka et al.

ISIJ International, 2011, 51(11), 1831-1837

Permalink : https://hdl.handle.net/2115/75399

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アクセス権	open access
URI	https://hdl.handle.net/2115/75399
タイトル	Suppression of Coarse Columnar Grain Formation in As-cast Austenite Structure of a Hyperperitectic Carbon Steel by Nb Addition
著者	Ohno, Munekazu ; Yamaguchi, Tetsuya ; Matsuura, Kiyotaka ; Isobe, Kohichi
e-Rad_Researcher 30431331 著者名 Ohno, Munekazu
著者名 Yamaguchi, Tetsuya
e-Rad_Researcher 60142692 著者名 Matsuura, Kiyotaka
著者名 Isobe, Kohichi
言語	英語
キーワード	solidification
	casting
	peritectic steel
	pinning
	grain refinement
	austenite grain structure
	columnar grain
発行日	2011-11
出版者	Iron and Steel Institute of Japan
出版者	日本鉄鋼協会
収録物名	ISIJ International
巻(号)	51(11)
ページ	1831-1837
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	著作権は日本鉄鋼協会にある
PISSN	0915-1559
EISSN	1347-5460
NCID	AA10680712
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.2355/isijinternational.51.1831