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| 碳锰洁净钢中镧和铈在晶界的行为 | |
| 引用本文： | 林勤,郭锋,朱兴元.碳锰洁净钢中镧和铈在晶界的行为[J].中国稀土学报,2006,24(6):729-733. |
| 作者姓名： | 林勤 郭锋 朱兴元 |
| 作者单位： | 1. 北京科技大学物理化学系,北京,100083 2. 内蒙古工业大学材料科学与工程学院,内蒙古,呼和浩特,010062 3. 武汉理工大学材料科学与工程学院,湖北,武汉,430070 |
| 摘 要： | 应用高分辨TEM，SEM和XRD研究碳锰洁净钢中镧和铈的存在形式、分布以及在晶界的行为。研究结果表明，镧和铈在洁净钢中存在固溶态、稀土夹杂物和稀土第二相。固溶稀土偏析在晶界，洁净钢中稀土仍有净化钢液和变质夹杂的作用。适量稀土能减少S和P在晶界的偏析，净化晶界提高钢的冲击韧性。过量稀土在晶界产生有害的稀土第二相，导致性能显著降低。 |
| 关 键 词： | 镧 铈 晶界 碳锰洁净钢 稀土 |
| 文章编号： | 1000-4343（2006）06-0729-05 |
| 收稿时间： | 05 15 2006 12:00AM |
| 修稿时间： | 2006-05-152006-07-19 |
Behavior of Lanthanum and Cerium on Grain Boundaries in Carbon Manganese Clean Steel |
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| Lin Qin,Guo Feng,Zhu Xingyuan.Behavior of Lanthanum and Cerium on Grain Boundaries in Carbon Manganese Clean Steel[J].Journal of the Chinese Rare Earth Society,2006,24(6):729-733. | |
| Authors: | Lin Qin Guo Feng Zhu Xingyuan |
| Institution: | 1. Department of Physical Chemistry, University of Science and Technology Beijing , Beijing 100083, China ; 2. College of Material Science and Technology, Inner Mongolia University of Technology, Huhhot 010062, China ; 3. College of Material Science and Technology, Wuhan University of Technology, Wuhan 430070, China |
| Abstract: | In carbon manganese clean steel,the behaviors of La and Ce on grain boundaries were investigated by high-resolution transmission electron microscopy(HRTEM),SEM,EDS and XRD analysis.The existent phases of RE have solid solution La or Ce,RE inclusion and RE second phases(RE-Fe-P,Fe-La,Fe-La eutectic and FeCe phase) in clean steel.The dissolved La or Ce segregates in the grain boundaries,which reduces the segregation of both S and P on grain boundaries at suitable RE content.It improves the strength of grain boundaries and enhances the impact toughness of steel obviously.La and Ce still have purifying effect in molten steel and modify inclusion in clean steel.While excess La or Ce,La-Fe-P, La-P and Fe-La eutectic or Ce-Fe-P and Fe-Ce intermetallic compound can form along grain boundaries.It leads to decrease of the impact energy of steel significantly. |
| Keywords: | lanthanum cerium grain boundaries carbon manganese clean steel rare earths |
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