TC4合金的电子束冷床熔炼研究  

Electron Beam Cold Hearth Melting of TC4

作　　者：张英明[1] 孙军[1] 韩明臣[2] 周廉[2] 杨建朝[2] 

机构地区：[1]西安交通大学材料科学与工程学院,西安710049 [2]西北有色金属研究院工程中心,西安710016

出　　处：《宇航材料工艺》2007年第5期50-52,共3页Aerospace Materials & Technology

基　　金：国家973项目(2007CB613802)

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.

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 

分 类 号：TF823[冶金工程—有色金属冶金]