含铝钛合金电渣重熔中的渣系设计及脱氧热力学

以炉渣离子、分子共存理论为基础,1Cr21Ni5Ti钢为研究对象,Al为脱氧剂,根据熔渣-金属中各个组元的平衡反应和质量守恒,建立了脱氧热力学模型,并在脱氧基础上设计了渣系.在脱氧剂Al不同的加入量条件下对1Cr21Ni5Ti钢中的Si,Al,Mn的平衡质量分数和渣中Ti O2的需求量进行了计算,Ti O2的加入保证了钢中Ti的含量.结果表明:随脱氧剂Al的增加,Si,Al,Mn,Al2O3的平衡质量分数呈上升的趋势,Si O2,Fe O,Mn O以及渣系中Ti O2的设计量呈下降的趋势;当Al加入量达到0.2%后,渣中不稳定氧化物含量很低,大部分Al进入到钢液中,造成钢液增Al].根据1Cr21Ni5Ti的Si,Al,Mn的成分要求,得到Al的最大加入量为0.15%/吨钢,此时渣系中Ti O2的设计量为4%,达到保钛的目的.

Deoxidation Thermodynamics and Slag Designing in ESR Process for Alvminum-Titanium Alloy

A thermodynamics model for deoxidation in 1Cr21Ni5Ti system with Al as a deoxidizer and a slag designed for this system was developed based on ion and molecule coexistence theory (IMCT)， thermodynamics equilibrium and mass conservation. The equilibrium mass fractions of Si， Al， Mn in steel and the TiO₂ content in slag designed for controlling the ［Ti］ were obtained depending on the increasing Al content. The results showed that the mass fractions of Si， Al， Mn and Al₂O₃ increase with increasing Al content， while the mass fractions of SiO₂， FeO， MnO and TiO₂ content tend to decrease. When Al content increases to 0.2%， the Al mass fraction in steel may increase with little unstable oxide in slag and the deoxidizer Al dissolving into steel. Considering the limitation of Si， Al， Mn mass fraction and little wave of Ti， the amount of Al added in one ton steel should not exceed 0.15% and the TiO₂ content designed for controlling Ti is 4%.