摘要
首先通过理论分析,发现熔速对富Ti偏析有重要影响,然后验证不同熔速条件下获得的Nb Ti超导合金铸锭中富Ti偏析的情况。结果发现,降低熔速,减弱了Ti元素在晶界的富集,有利于提高铸锭的宏、微观成分均匀性。以9kg/min熔速制备Φ520 mm规格Nb Ti合金铸锭,铸锭表面光整,熔炼过程稳定,成分均匀性好,与美国华昌公司Nb Ti合金棒坯的水平基本相当,是制备工程化应用的Nb Ti合金铸锭的理想熔速。
The melting rate can influence the content of Ti at the solid/liquid interface according to the classic solidification theory; then, the Ti-riched segregation has been researched in the NbTi alloy ingots prepared at different melting rates. The results indicate that the Ti-riched segregation in grain boundary is restrained by decreasing the melting rate. It is advantageous to improve the macro- and micro- elements homogeneity for NbTi ingot. The Φ520 mm NbTi ingot, whose surface and homogeneity are very good, is fabricated at 9 kg/min melting rate and it reaches the standard of WahChang of U.S. Finally, the appropriate melting rate of fabricating NbTi alloy ingot is obtained for engineering application.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2014年第12期3143-3148,共6页
Rare Metal Materials and Engineering
基金
陕西省青年科技新星项目(2011kjxx07)
