铸造技术2012，Vol.33Issue(3)：270-273,4.
La对Fe-36Ni低膨胀合金凝固组织的影响
Effect of La on Solidification Structure of Fe-36Ni Invar Alloy
于彦冲 1陈伟庆 1郑宏光2
作者信息
- 1. 钢铁冶金新技术国家重点实验室,北京科技大学冶金与生态工程学院,北京100083
- 2. 宝钢研究院冶金工艺所,上海201900
- 折叠
摘要
Abstract
The effect of La on the solidification structure of Fe-36Ni invar alloy was investigated. The results show that the solidification structure of the alloy is well improved. The equiaxed grain ratio in solidification structure increases, the equiaxed grain size decreases, the dendrite becomes thinner and shorter, the primary dendrite arm spacing decreases, the secondary dendrite arm spacing unchangs with the increase of La content. An amount of high-melting compounds (La2O2S) with a size of 4 μm form in the alloy because of La addition. Based on the theory of lattice misfit, the lattice misfit between low-index surface of Fe-36Ni invar alloy and low-index surface of La2O2S is only 5.42%, which is relatively low. As a result, La2O2S can serve as the core of heterogeneous nucleation, improve nucleation ratio and refine solidification structure of the alloy.关键词
Fe-36Ni低膨胀合金/镧/凝固组织/错配度Key words
Fe-36Ni invar alloy/ lanthanum/ solidification structure/ lattice misfit分类
矿业与冶金引用本文复制引用
于彦冲,陈伟庆,郑宏光..La对Fe-36Ni低膨胀合金凝固组织的影响[J].铸造技术,2012,33(3):270-273,4.
