电子束冷床熔炼TC4合金温度场模拟

Temperature field simulation of electron beam cold hearth melting TC4 alloy

利用ANSYS软件对电子束冷床熔炼TC4钛合金过程进行模拟研究。结果表明:熔体从冷床滴入坩埚之后,主要出现熔体升温、形成稳定熔池、熔体凝固、熔体温度下降和凝固结束这5个阶段。在开始熔炼时,熔体温度较低,升温也比较慢,但随着熔炼的进行,熔体升温加快,并维持在高温状态,最后熔体发生凝固降温,且降温速度很快。降温过程主要分为两个阶段,在快速降温阶段,熔体快速出现部分凝固,而在降温平衡阶段,熔体主要进行补缩。当降温时间达到500 s时,熔体温度基本保持不变。

From ANSYS simulation, electron beam cold hearth melting process of TC4 titanium alloy was studied. The results show that after the melt trickles from cooling bed down to the crucible, there are five main melting stages, i.e. the melt temperature increasing, a stable pool forming, melt solidification, melt temperature decreasing and solidification ending. At the beginning of melting, the melt temperature is relatively slow, but as the melting progresses, the melt temperature speeds up, and maintains at high temperature, fmally solidified melt is cooled, and the cooling speed is fast. The cooling process is divided into two stages. At the rapid cooling stage, some melts solidify rapidly. The equilibrium phase of cooling stage is melt mainly for feeding. When the cooling time reaches 500 s, the melt temperature remains unchanged.