电子束熔炼工艺对Ta铸锭表面质量的影响

Effect of Electron Beam Melting Process on Surface Quality of Ta Ingot

本文通过固定熔速调整功率的试验,研究了电子束熔炼工艺对Φ100mm钽锭的表面质量影响。试验结果表明:熔炼速度一定时,熔炼功率减小,比电能减少,钽铸锭表面易生成冷隔、夹生等缺陷;熔炼功率过大,熔池温度过高导致过热过熔,对产品的结晶组织不利甚至产生严重的金属瘤疤;当电子束熔炼炉的真空度为2×10-2Pa,熔炼速度30kg/h,熔炼功率为160k W,冷却时间4h时,有利于杂质元素的扩散和挥发,钽铸锭提纯效果好。

In this paper, the effect of electron beam smelting process on the surface quality of Φ100 Ta ingot is studied through experiment of adjusting the melting power at a fixed melting rate. The experiments results show that, when the melting speed is constant, the melting power is reduced, and the specific electrical energy is reduced, the surface of Ta ingots is prone to defects such as cold insulation and pinching. The melting power is too high, and the temperature of the molten pool is too high, resulting in overheating and overmelting. The microstructure is unfavorable and even produces severe metal tumor scars. When the vacuum of the electron beam melting furnace is 2 ×10-2 Pa, the melting speed is 30 kg/h, the melting power is 160 kW, and the cooling time is 4 h, which is beneficial to the diffusion and volatilization of impurity elements.