430鐵素體不銹鋼中Ti<sub>2</sub>O<sub>3</sub>+TiN復合核心形成的熱力學研究

施曉芳; 成國光; 趙沛

doi:10.13374/j.issn1001-053x.2010.10.007

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430鐵素體不銹鋼中Ti₂O₃+TiN復合核心形成的熱力學研究

doi: 10.13374/j.issn1001-053x.2010.10.007

1. 北京科技大學冶金與生態工程學院, 北京 100083;
2. 鋼鐵研究總院, 北京 100081

基金項目:

國家自然科學基金資助項目(No.50734008)

教育部博士點基金資助項目(No.20070008042)

詳細信息

作者簡介:
施曉芳(1978-),女,博士研究生;成國光(1964-),男,教授,博士生導師,E-mail:chengguoguang@ustb.edu.cn

中圖分類號: TF764⁺.1
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- 被引次數: 0
出版歷程
- 收稿日期: 2009-11-23

Thermodynamic study of Ti₂O₃+TiN complex nucleus formation in 430 ferritic stainless steel

1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Central Iron and Steel Research Institute, Beijing 100081, China

摘要

摘要: 通過理論分析Ti₂O₃、TiN在430鐵素體不銹鋼中的形成規律,提出了凝固前沿形成Ti₂O₃+TiN復合核心所需的Ti、Al、O和N含量.根據該成分要求,在真空感應爐中進行實驗得到鑄錠,制備金相試樣在掃描電鏡(SEM)和透射電鏡(TEM)上觀察析出物的特征.通過SEM發現,析出物細小彌散分布,尺寸約為2μm.從形貌上看,它由兩層組成,氮化鈦圍繞氧化鈦析出.通過析出物的TEM衍射花樣進一步確認,析出物的中心層為Ti₂O₃,外層為TiN.合理控制鋼液成分,即使在較低鈦含量時也可以形成Ti₂O₃+TiN的復合核心.
- 不銹鋼 /
- 析出物 /
- 熱力學 /
- 凝固
Abstract: The principles of Ti₂O₃ and TiN formation in 430 ferritic stainless steel were theoretically analyzed. The steel's compositions including Ti, Al, O and N for forming Ti₂O₃ + TiN complex nuclei on solidification fronts were put forward. According to composition requirements, the experiment was conducted in a vacuum induction furnace to get an ingot. Some metallographie samples were prepared for observing the feature of precipitates under scanning electron microscopy (SEM) and transmission electron microscope (TEM). It was observed by SEM that these precipitates were fine and dispersively distributed. Their sizes were about 2 μm and titanium nitride precipitates around titanium oxide. It was further confirmed by TEM diffraction patterns of precipitates that the center layer of precipitates was Ti₂O₃ and the outer layer of precipitates was TiN. If the steel's composition was reasonably controlled, Ti₂O₃ + TiN complex nuclei can form even under a low titanium content.
- stainless steel /
- precipitates /
- thermodynamics /
- solidification