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Effects of Addition of Titanium and Boron on Columnar Austenite Grain in Carbon Steel

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Title: Effects of Addition of Titanium and Boron on Columnar Austenite Grain in Carbon Steel
Authors: Sasaki, Masayoshi Browse this author
Matsuura, Kiyotaka Browse this author →KAKEN DB
Ohsasa, Kenichi Browse this author
Ohno, Munekazu Browse this author →KAKEN DB
Keywords: carbon steel
austenite structure
grain refinement
columnar-to-equiaxed transition
Issue Date: 15-Sep-2009
Publisher: Iron and Steel Institute of Japan
Journal Title: ISIJ International
Volume: 49
Issue: 9
Start Page: 1367
End Page: 1371
Publisher DOI: 10.2355/isijinternational.49.1367
Abstract: Effects of titanium and boron addition on columnar austenite grain structure of S45C steel have been investigated in casting experiments with different cooling rates of 4.50 and 16.67°C/s. Without addition of these elements, the columnar austenite grains develop over the whole sample under the present casting conditions. The addition of titanium and boron induces formation of equiaxed austenite grains and, importantly, fully equiaxed austenite structure was observed in the sample with 0.2 mol% Ti and 0.4 mol% B. The microstructural observations indicated that this behavior of austenite structure stems from the columnar-to-equiaxed transition of ferrite dendrite structure. The addition of these elements, furthermore, leads to refinement of the columnar austenite grains, which is ascribable to pinning effect of boron nitride and titanium carbonitride.
Rights: 著作権は日本鉄鋼協会にある
Type: article
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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