工程科学学报2016，Vol.38Issue(7)：937-944,8.DOI:10.13374/j.issn2095-9389.2016.07.007
低碳Fe--Mn--Si--Al系TWIP钢的显微偏析行为
Microsegregation in low carbon Fe--Mn--Si--Al TWIP steel
摘要
Abstract
Microsegregation in low carbon Fe-25Mn-3Si-3Al TWIP steel produced in the laboratory and steel plant were system-atically investigated by electron microprobe analysis. The results show that the dendritic segregation is serious in both the laboratorial ingot and mold casting after AOD steelmaking at the industrial plant. Additionally, microsegregation in the AOD ingot is higher, and the greatest amounts of segregation of Mn and Al are measured to be 6. 8% and 2. 4%, respectively. After electroslag remelting in the steel plant, the grain boundary segregation is serious, and it completely improves after a forging process. A higher alloy composition and a wider crystallization temperature interval are the main reasons for the serious microsegregation. All specimens of the TWIP steel have the same law. Mn shows obvious negative segregation, Al and Si exhibit positive segregation, and Al has the highest degree of segregation. The elements’ solute distribution coefficient K of the TWIP steel was calculated using the Thermo- Calc software. It is found that the microsegregation laws of Mn and Al in theory are opposite to those in the experiment, and the main reason is silicon con-tent.关键词
低碳钢/TWIP钢/显微偏析/枝晶/晶界/硅含量Key words
low carbon steel/TWIP steel/microsegregation/dendrites/grain boundaries/silicon content分类
矿业与冶金引用本文复制引用
李世琪,刘建华,刘洪波,赤小浩,李康伟,韩志彪..低碳Fe--Mn--Si--Al系TWIP钢的显微偏析行为[J].工程科学学报,2016,38(7):937-944,8.基金项目
国家自然科学基金资助项目(51574022) （51574022）
