| 冷却速度对La脱氧钢中晶内铁素体形成的影响 |
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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; |
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| 基金项目： | 国家自然科学基金;中央高校基本科研业务费专项 |
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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La2O2S夹杂物与α—Fe相的品格错配度最小为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 |
| 收稿时间： | 2013-10-08 |
Effect of cooling rate on intragranular ferrite formation in La deoxidized steel |
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| Affiliation: | 1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;2. School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing, Beijing 100083, China;3. Sino-steel Jilin Electro-mechanical Equipment Co., Ltd., Jilin 132021, China;4. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | The microstructures of La deoxidized steels obtained at different cooling rates were investigaled 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 and α-Fe is small; especially, this value of La2O2S is 0.2%. These kinds of inclusions can induce IAF nucleation and sympathetic nucleation, and also make grains refined. |
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