摘要
由于电子束冷床熔炼的高真空引起TC4合金中的Al元素挥发损失,不利于控制铸锭Al含量。本文研究了TC4合金在500 kW电子束冷床炉上的熔炼工艺。结果表明,熔炼过程中,Al的挥发损失最为严重,为12%-22%。铸锭的宏观组织均匀,结晶晶粒为从外向内向上的柱状晶,铸锭心部是等轴晶。所生产的TC4铸锭经锻造加工,棒材力学性能符合国家标准。生产TC4铸锭的合适工艺为：原料中的Al质量分数应控制在7.0%-7.5%,熔炼功率为250 kW,熔化速度为100 kg/h。
Because the high vacuum in the EBCHR process induces evaporation of AI element in TC4 alloy,it is difficult to control the Al content in the casting. In this article, the TC4 melting parameter by using 500 kW EBCHR furnace is studied. The result shows that the evaporation of Al is serious during melting process and the evaporation loss of Al is between 12% - 22%. The macrostructure of the ingot is homogeneous. The solidifying grains grow from outer to inner side and from bottom to up side. They are columnar gains. In the center of the ingot are equi-axed grains. The mechanical property of the TC4 bar made of the EBCHR TC4 ingot meets the state standard. The suitable melting parameter for the TC4 is as foUows：Al content in feeding material is 7.0% -7.5% ,the melting power 250 kW and the melting rate 100 kg/h.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2007年第5期50-52,共3页
Aerospace Materials & Technology
基金
国家973项目(2007CB613802)
关键词
TC4钛合金
电子束冷床熔炼
Al的挥发损失
低成本钛合金
TC4 titanium alloy, Electron beam cold hearth remelting, Evoparation of AI, Low cost titanium alloy
