| 冷却速度对La脱氧钢中晶内铁素体形成的影响 |
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| 引用本文： | 李红科,宋波,王利勇,胡春林,毛璟红.冷却速度对La脱氧钢中晶内铁素体形成的影响[J].北京科技大学学报,2015(2):180-184. |
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| 作者姓名： | 李红科 宋波 王利勇 胡春林 毛璟红 |
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| 作者单位： | 1. 北京科技大学钢铁冶金新技术国家重点实验室，北京100083; 北京科技大学冶金与生态工程学院，北京100083; 中钢集团吉林机电设备有限公司，吉林132021;2. 北京科技大学钢铁冶金新技术国家重点实验室，北京100083; 北京科技大学冶金与生态工程学院，北京100083;3. 北京科技大学材料学与工程学院,北京,100083 |
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| 基金项目： | 国家自然科学基金资助项目，中央高校基本科研业务费专项资金资助项目 |
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| 摘 要： | 采用光学显微镜、带能谱的扫描电子显微镜等分析技术观察了不同冷速下La脱氧钢的显微组织，并绘制了静态连续冷却转变图.实验结果发现，在4~10℃·s-1的冷速范围内，钢中会有大量晶内铁素体形成，其中在8℃·s-1冷却时可以获得大量细小且弥散分布的晶内针状铁素体. La脱氧钢中含La夹杂物与α-Fe相有较低错配度，其中La2 O2 S夹杂物与α-Fe相的晶格错配度最小为0.2%，钢中含La夹杂物均可诱导晶内针状铁素体形核并可促进感生形核，进而细化组织.
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| 关 键 词： | 低合金钢 镧 冷却速度 铁素体 显微组织 |
Effect of cooling rate on intragranular ferrite formation in La deoxidized steel |
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| LI Hong-ke,SONG Bo,WANG Li-yong,HU Chun-lin,MAO Jing-hong.Effect of cooling rate on intragranular ferrite formation in La deoxidized steel[J].Journal of University of Science and Technology Beijing,2015(2):180-184. |
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| Authors: | LI Hong-ke SONG Bo WANG Li-yong HU Chun-lin MAO Jing-hong |
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| Institution: | LI Hong-ke;SONG Bo;WANG Li-yong;HU Chun-lin;MAO Jing-hong;State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing;Sino-steel Jilin Electro-mechanical Equipment Co. ,Ltd.;School of Materials Science and Engineering,University of Science and Technology Beijing; |
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| Abstract: | The microstructures of La deoxidized steels obtained at different cooling rates were investigated by optical microscopy and scanning electron microscopy coupled to an energy dispersive X-ray spectrometer. The continuous cooling transformation diagram of the tested steel was also drawn in this paper. It is found that in the cooling rate range of 4 to 10℃·s-1 , intragranular ferrite can form in the steel. While at the cooling rate of 8℃·s-1 , the microstructure mainly consists of fine and dispersed intragranular acicular ferrite ( IAF) . The lattice disregistry between lanthanum-containing inclusions andα-Fe is small;especially, this value of La2 O2 S is 0. 2%. These kinds of inclusions can induce IAF nucleation and sympathetic nucleation, and also make grains refined. |
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| Keywords: | low alloy steels lanthanum cooling rate ferrite microstructure |
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