采用数值计算方法对比研究了直通式、4分径向以及新型4分切向水口对大方坯连铸结晶器内钢水流动与凝固行为的影响.结果表明,当前常用的直通式水口对坯壳无冲击,利于坯壳均匀生长,但钢水冲击深度大,易在弯月面处形成死区,不利于大方坯内部及表面质量的提高;改用4分水口浇铸时,结晶器宽、窄面冲击区附近都会出现不同程度的坯壳厚度零增长区域.但采用4分切向水口可明显减弱射流对坯壳的冲击,结晶器横截面上的凝壳厚度沿周向更加均匀.此外,结晶器内弯月面处的死区基本消除,钢液面处温度可提高4.48～5.6℃,有利于结晶器内钢水过热耗散及保护渣的熔化.结晶器出口处的宽、窄面中点坯壳厚度分别达到20.1mm和20.8mm,为提高大方坯的拉速创造了可能.
参考文献
| [1] | 徐少兵,吴建洲.国内外大方坯连铸机新技术发展综述[J].中国冶金,2008(04):1-6. |
| [2] | Kholmatov S;Yokoya S;Takagi S et al.Development of Flow Field and Temperature Distribution During Changing Divergent Angle of the Nozzle When Using Swirl Flow in a Square Continuous Casting[J].ISIJ International,2007,47(01):80. |
| [3] | 王维维,张家泉,陈素琼,董进明.水口侧孔倾角对大方坯结晶器流场和液面波动的影响[J].北京科技大学学报,2007(08):816-821,844. |
| [4] | Ha M Y;Lee H G;Seong S H .Numerical Simulation of Three-Dimensional Flow,Heat Transfer,and Solidification of Steel in Continuous Casting Mold With Electromagnetic Brake[J].Journal of Materials Processing Technology,2003,133:322. |
| [5] | Santos C A;Fortaleza E L;Garcia A et al.A Solidification Heat Transfer Model and a Neural Network Based Algorithm Applied to the Continuous Casting of Steel Billets and Blooms[J].Modelling and Simulation in Materials Science and Engineering,2005,13:1071. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%