摘要
研究了电热合金钢OCr21A16NbRE电渣重熔用渣70%CaF2-25%Al2O3-5%CaO在正常重熔制度下(A=2800 A,V=30 V)液态炉渣自然冷却与经过渣钢反应后冷却至固相渣的各部位成分与物相,分析了钢液中稀土元素的烧损。结果表明,液渣冷却的固相中不含稀土元素,其成分点位于CaF2-CaO·2Al203-Ca0·6Al203组成的子三角形内,各层化学成分和物相不同,但以CaF2为主。炉渣经渣钢反应后可分为五层,颜色、物相各不相同;CaF2含量最高部位在上两层,Al2O3含量从无到有逐层升高;各层均检测到稀土氧化物,中间层及最底层(钢液滴落处)含量较高,稀土相中以铈镧的铝酸盐(Ce,La)x(AlO2)y为主相,该相结构致密硬度高。计算表明,在中下层区域,炉渣氧化性较强,钢中稀土元素主要在此部位被氧化。增加渣中Y203量有利于提高电渣锭中稀土元素Y的含量。
The ingredient and phases of solid phase slag without remelting liquid slag air cooling and with liquid-slag reaction remelting slag,air cooling of slag 70%CaF2-25%Al2O3-5%CaO for ESR of electrothermal alloy steel 0Cr21A16 NbRE with normal remelting process(A=2800 A,V=30 V)are studied,and the burning loss of RE elements in liquid is analyzed.The results show that without remelting air cooling slag has not RE elements it locates in CaF2-CaO·2Al203-CaO·6Al203 sub-triangle.The solid phase slag with liquid-slag reaction can be divided into five layers with different colors,different phase,the content of CaF2 on the top is highest and decreases layer by layer,A1203 increase simultaneously,RE oxide is found in layers and at the middle and bottom its content is higher,(Ce,La)x(A102)y is major RE oxide phase in slag,which density is high.It is obtained by calculation that slag oxidability is stronger in the middle and bottom of slag,RE element in steel is oxided here.Increasing the Y203 amount in slag is favourable to increase the RE element Y content in ESR ingot.
作者
王振虎
李彬
郭汉杰
郭靖
Wang Zhenhu;Li Bin;Guo Hanjie;Guo Jing(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083;Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials,Beijing 100083)
出处
《特殊钢》
北大核心
2020年第1期6-11,共6页
Special Steel
基金
国家自然科学基金项目资助(U1560203,51274031)
关键词
电渣重熔
电热合金
化学反应
相
热力学
Electroslag Remelting
Electrothermal Alloy
Chemical Reaction
Phase
Thermodynamics
