电子束冷床熔炼大型钛合金(Ti-6%Al-4%V)板坯的铝元素偏析控制数值模拟研究  

Numerical study of aluminum segregation during electron beam cold hearth melting for large-scale Ti-6%Al-4%V alloy slab ingots

作　　者：高磊[1] 史亚鸣[1,2] 王云鹏 刘昆 辛禹辰 冀浩航 姜浩 朱晓龙 GAO Lei;SHI Yaming;WANG Yunpeng;LIU Kun;XIN Yuchen;JI Haohang;JIANG Hao;ZHU Xiaolong(Kunming University of Science and Technology,Kunming 650093,Yunnan,China;Yunnan Titanium Industry Co.,Ltd.,Chuxiong 675000,Yunnan,China;Panzhihua Yuntai Industrial Co.,Ltd.,Panzhihua 617112,Sichuan,China)

机构地区：[1]昆明理工大学,云南昆明650093 [2]云南钛业股份有限公司,云南楚雄675000 [3]攀枝花云钛实业有限公司,四川攀枝花617112

出　　处：《宝钢技术》2024年第4期16-24,共9页Baosteel Technology

摘　　要：建立验证了三维多物理场耦合数值模型,研究了电子束冷床熔炼(EBCHM)大尺寸TC4(Ti-6%Al-4%V)钛合金板坯中铝元素的偏析控制机制。定性预测了不同铸造条件下铝元素在熔炼区和凝固区的宏观偏析趋势。结果表明,由于溢流口附近熔池形状的纵向演变趋势,拉锭速度增加对铝元素偏析控制的影响很小。降低液面温度是限制铝元素蒸发损失、控制铝元素偏析的有效方案。对于拉锭速度为8 mm/min的EBCHM过程,随着液面温度从2273 K降至2073 K,熔池中铝元素偏析度φl从0.78增至0.96,凝固横截面上相应的铝元素偏析程度φc从0.67增至0.93。A three-dimensional multi-physics coupled numerical model was established and validated to study the control mechanism of aluminum segregation in large TC4(Ti-6%Al-4%V)titanium alloy slabs during electron beam cold hearth melting(EBCHM).It qualitatively predicts the macroscopic segregation trends of aluminum under different casting conditions in the melting and solidification zones.The results indicate that the increase in casting speed has little effect on controlling aluminum segregation due to the longitudinal evolution trend of the melt pool shape near the overflow port.Lowering the liquid surface temperature is an effective solution to limit aluminum evaporation loss and control aluminum segregation.For the EBCHM process with a casting speed of 8 mm/min,as the liquid surface temperature decreases from 2273 K to 2073 K,the segregation degree of aluminum in the melt pool,φl,increases from 0.78 to 0.96,and the corresponding segregation degree of aluminum on the solidification cross-section,φc,increases from 0.67 to 0.93.

关 键 词：电子束冷床熔炼 Ti-6%Al-4%V板坯 铝挥发 宏观偏析 

分 类 号：TG146.2[一般工业技术—材料科学与工程]