Ti处理FeCrAl不锈钢的凝固组织和夹杂物

韩志彪; 刘建华; 何杨

doi:10.7513/j.issn.1004-7638.2016.02.022

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Ti处理FeCrAl不锈钢的凝固组织和夹杂物

doi: 10.7513/j.issn.1004-7638.2016.02.022

北京科技大学冶金工程研究院, 北京 100083

基金项目:

国家自然科学基金(51374023)资助项目

详细信息

作者简介:
韩志彪(1983-),男,北京科技大学冶金工程专业在读博士生,主要从事FeCrAl不锈钢凝固特性的研究

中图分类号: TF823,TF771
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- 被引次数: 0
出版历程
- 收稿日期: 2015-10-30

Solidification Structure and Inclusions of Ti-containing FeCrAl Stainless Steel

Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, China

摘要

摘要: 采用Thermo-calc软件对不同Ti含量的FeCrAl不锈钢铸锭Scheil凝固过程中TiN和AlN在凝固前沿液相的析出规律进行计算,结果表明铸锭中Ti含量应控制在0.08%附近。铸锭的凝固组织分析表明中心等轴晶率随着Ti含量的提高先升高后降低,Ti含量为0.088%时纵截面和横截面中心等轴晶率均达到最大值,分别为39.5%和16%。高温拉伸试验结果表明,Ti的加入对铸锭的高温力学性能没有明显改善作用。扫描电镜分析表明铸锭中主要有纯TiN、TiN-AlN复合夹杂、TiN-Al₂O₃复合夹杂、纯TiS夹杂以及TiS-氧化物复合夹杂这五种含Ti夹杂物,前三种夹杂物占据主要地位,后两种夹杂物则非常少。
- 铁铬铝不锈钢 /
- 铸锭钛处理 /
- Schei凝固 /
- 柱状晶 /
- 等轴晶
Abstract: The precipitation of TiN and AlN in FeCrAl stainless steel were calculated using Thermo-Calc software.The results indicated that the Ti content should be controlled around 0.08%.The ratios of central equiaxed grain in longitudinal and cross section firstly rise then decreased with Ti content.When Ti content was 0.088%,these two ratios reached maximum of 39.5% and 16%,respectively.Results of high temperature tensile indicated that the addition of Ti did not improve the high-temperature mechanical properties.SEM analysis indicated that there were mainly five kinds of Ti-containing inclusions,which were pure TiN,TiN(AlN) compound inclusion,TiN-Al₂O₃ compound inclusion,pure TiS and TiS(oxidation) compound inclusion.The former three types of inclusions were dominant while the latter two were very low in terms of their quantities.
- FeCrAl stainless steel /
- solidification structure /
- TiN /
- AlN /
- TiS