电子束冷床熔炼Ti-Al-V合金过程中Al元素的挥发损失  

Al Element Volatilization Loss of Ti-Al-V Alloy During Electron Beam Melting

作　　者：张浩泽 黄海广[1,2] 王伟 易健宏[1] Zhang Haoze;Huang Haiguang;Wang Wei;Yi Jianhong(School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;Yunnan Titanium Industry Co.,Ltd,Chuxiong 651209,China;School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]云南钛业股份有限公司,云南楚雄651209 [3]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《稀有金属材料与工程》2021年第7期2415-2420,共6页Rare Metal Materials and Engineering

基　　金：云南省重大科技专项(2018ZE002)。

摘　　要：采用电子束冷床熔炼Ti-Al-V合金扁锭,对扁锭化学成分和熔炼工艺进行对比分析。结果表明,熔炼速度显著影响铸锭长度方向成分的稳定性,铸锭长度方向Al含量随熔炼速度的增加而升高,反之亦然;电子束冷床熔炼铸锭横向截面成分较均匀,未出现Al元素的偏析现象。通过对电子束冷床熔炼3个阶段熔体流动特征分析表明,冷床和结晶器内熔体界面层的质量传递不再服从Machlin模型,提出了原料熔化、冷床熔炼、结晶器凝固3个阶段Al元素挥发通量的计算方法,理论计算结果与实验结果基本吻合。The Ti-Al-V flat ingots were fabricated by electron beam cold hearth melting(EBCHM), the chemical composition and melting process of the flat ingots were compared and analyzed. The experimental results show that the stability of chemical compositi on in the longitudinal direction is significantly affected by melting speed. As the increase of melting speed, the Al content in the longit udinal direction also increases and vice versa. The chemical composition of the cross-section of the flat ingots is all uniform and the segregation of element Al is not found in this experimental condition. Through the analysis of the flowing characteristics of melt in thr ee stages of EBCHM, it is found that the Machlin model is not applicable to the mass transfer of melt boundary lay er in cold hearth and crystallizer. The calculation method of aluminum volatilizing flux in three stages including the melting of raw materials, cold hearth melt ing and the solidification process of molten alloy in mould were established. Results of calcul ation are in good agreement with those of experiment.

关 键 词：Ti-Al-V合金 电子束冷床熔炼 Al元素挥发 数学模型 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TF134[金属学及工艺—金属材料]