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Refinement of As-cast Austenite Microstructure in S45C Steel by Titanium Addition
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 | casting | austenite | 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 |
URI: | http://hdl.handle.net/2115/75412 |
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)
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Submitter: 大野 宗一
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