Fe-Ti-N形核合金对工业纯铁凝固组织的细化作用  

THE REFINING EFFECT OF Fe-Ti-N NUCLEATION ALLOY ON THE SOLIDIFIED STRUCTURE OF INDUSTRIAL PURE IRON

作　　者：吉静[1] 高海燕[1] 王超[1] 王俊[1] 孙宝德[1] 阮晓明[2] 

机构地区：[1]上海交通大学金属基复合材料国家重点实验室,上海200240 [2]宝钢股份有限公司

出　　处：《上海金属》2009年第2期43-47,共5页Shanghai Metals

基　　金：国家973计划课题(2006cb708600);国家自然科学基金(50801046);上海市优秀学科带头人课题(08xd14231)

摘　　要：通过在铁钛熔体中引入氮气,制备了形核Fe-Ti-N合金。扫描电镜和能谱仪观察结果表明,该形核合金中均匀分布着大量的TiN粒子。应用该形核合金对熔态工业纯铁进行凝固组织细化实验,结果发现,添加2wt%合金后,纯铁铸锭的等轴晶区比例从30%提高到60%,平均晶粒尺寸从700μm降低到400μm。The Fe-Ti-N nucleation alloy was prepared through the chemical reaction of nitrogen gas with Ti dissolved in the Fe-melt. The observations of SEM and EDX showed there were a lot of TiN particles uniformly distributed in the Fe matrix. The refining of the solidified structure was performed by adding this nucleation alloy into the pure Fe melts. The results showed that the equiaxed grains proportion of the test ingot increased from 30% to 60% after the 2 wt% addition of the Fe-Ti-N alloy, and the average grain size deceased from 700μm to 400μm.

关 键 词：Fe-Ti-N形核合金 工业纯铁 凝固组织 细化效果 

分 类 号：TG156.8[金属学及工艺—热处理] TG146.21[金属学及工艺—金属学]