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.
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