VAR法熔炼钛合金补缩过程温度变化规律研究  

Research on Temperature Field of Titanium Alloy during Feeding Stage with VAR Method

作　　者：赵小花 何龙 王玮东 罗文忠 杜建超[1,2] 付宝全[1,2] 

机构地区：[1]西部超导材料科技有限公司,陕西西安710018 [2]西北工业大学,陕西西安710072

出　　处：《钛工业进展》2013年第3期16-20,共5页Titanium Industry Progress

摘　　要：真空自耗电弧熔炼(VAR)法是目前熔炼钛及钛合金的主要方法,其中补缩阶段工艺参数对冒口大小及铸锭成品率具有重要影响。采用ANSYS有限元分析软件,研究分析了VAR法熔炼钛合金补缩过程中的温度分布。结果表明:与补缩前相比,补缩阶段辐射散热对于坩埚内热量分布影响增大;补缩前糊状区径向温度梯度远大于轴向;采用直线降电流方式进行补缩,凝固速率较快,不利于成分均匀;采用阶梯降电流方式进行补缩,熔池温度变化缓慢,有利于杂质溶解上浮和成分均匀;工艺参数对冒口形成的影响表现为熔速增大,冒口较大,熔炼电流增大,形成的冒口也较大。Vacuum arc remelting （VAR） is the main method for titanium alloy remelting. It is essential to study the temperature field distribution in the feeding stage, which has direct relationship with the rate of finished products. The temperature distribution in VAR feeding process was analyzed by ANSYS finite element software in this paper. The re- sults show that heat radiation plays an important role in the feeding stage compared with the stage before the feeding. In the mushy zone, the temperature gradient in radial direction is much larger than the axial direction before the feed- ing stage. The current drops in straight line way has faster solidification rate, but it is not benefit for composite homo- geneous. The current drops in steps way makes slower molten pool temperature variation, and it is benefit for impurity dissolving and composite homogeneous. As melting rate increasing, the hot top becomes larger. Enlarging the melting current makes the hot top larger.

关 键 词：钛合金 VAR 补缩 工艺参数 数值模拟 

分 类 号：TG243[金属学及工艺—铸造]