Formation mechanism of coarse columnar γ grains in as-cast hyperperitectic carbon steels

Tsuchiya, S.; Ohno, M.; Matsuura, K. et al.

Acta Materialia, 2011, 59(9), 3334-3342

Permalink : https://hdl.handle.net/2115/45645

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アクセス権
open access
URI
https://hdl.handle.net/2115/45645
タイトル
Formation mechanism of coarse columnar γ grains in as-cast hyperperitectic carbon steels
著者
Tsuchiya, S. ; Ohno, M. ; Matsuura, K. ; Isobe, K.
著者名
Tsuchiya, S.
著者名
Ohno, M.
著者名
Matsuura, K.
著者名
Isobe, K.
言語
英語
キーワード
Casting
Grain growth
Columnar austenite grain
Grain size
Peritectic solidification
発行日
2011-05
出版者
Elsevier
収録物名
Acta Materialia
巻(号)
59(9)
ページ
3334-3342
抄録
The formation mechanism of as-cast coarse columnar γ grain (CCG) structure in hyperperitectic carbon steels is investigated by means of rapid unidirectional solidification method. This method realizes the cooling conditions similar to those in the vicinity of a practical continuously cast slab surface. The microstructural observation of the quenched samples indicates that the CCG structure develops from the mold side along the direction of the temperature gradient. In the solidifying samples, fine columnar γ grains (FCGs) always exist ahead of the CCG region. Instead of continuous growth into the large grains, the FCGs always shrink and vanish due to the growth of CCGs initially formed near the mold side. Therefore, the grain size at a fixed point of the ingot discontinuously changes from the FCG to the CCG. The validity of this process was supported by numerical analyses. This finding is in marked contrast to the assumption made in conventional grain growth analysis on the CCG structure.
資源タイプ
学術雑誌論文
出版タイプ
Accepted Manuscript
PISSN
1359-6454
関連情報 (isVersionOf)
出版社版DOI
https://doi.org/10.1016/j.actamat.2011.02.007