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Refinement of As-cast Austenite Microstructure in S45C Steel by Titanium Addition

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ISIJ International, Vol. 48 (2008), No. 10, pp. 1373-1379.pdf2.62 MBPDFView/Open
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Title: Refinement of As-cast Austenite Microstructure in S45C Steel by Titanium Addition
Authors: Ohno, Munekazu Browse this author →KAKEN DB
Matsuura, Kiyotaka Browse this author →KAKEN DB
Keywords: carbon steel
grain refinement
columnar-to-equiaxed transition
titanium carbonitride
Issue Date: 15-Oct-2008
Publisher: Iron and Steel Institute of Japan
Journal Title: ISIJ International
Volume: 48
Issue: 10
Start Page: 1373
End Page: 1379
Publisher DOI: 10.2355/isijinternational.48.1373
Abstract: The effect of Ti addition on as-cast austenite (γ) structure of S45C steel has been investigated. The as-cast γ structure without the Ti addition consists of coarse columnar grains. The Ti addition leads to formation of equiaxed γ-grains and also grain refinement of the γ structure. Fully equiaxed and very fine γ-grain structure forms in a limited range of Ti addition of 0.13 to 0.17 wt%. The thermodynamic calculation of phase diagram showed that Ti carbonitride crystallizes as a primary phase in this composition range. The formation of the very fine equiaxed γ-grain structure originates from the columnar-to-equiaxed transition (CET) in δ-dendrite solidification induced by the primary Ti carbonitride particles. These particles act as the nucleation sites of the equiaxed δ-dendrite. The experimental results are suggestive of existence of finer Ti carbonitride particles retarding the grain growth of γ-phase after the peritectic transformation, which leads to the refinement of the as-cast γ structure.
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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