熔速对NbTi合金铸锭中富Ti偏析的影响  

Effect of Melting Rate on the Ti-Riched Segregation in NbTi Alloy Ingot

作　　者：付宝全[1,2] 张平祥[1,2] 李金山[1] 樊凯[2] 郑永健[1,2] 何永胜[1,2] 张奕[2] 刘向宏[2] 冯勇[2] 

机构地区：[1]西北工业大学,陕西西安710072 [2]西部超导材料科技股份有限公司,陕西西安710018

出　　处：《稀有金属材料与工程》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)

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.

关 键 词：NbTi合金 黑斑 木纹 熔速 

分 类 号：TG27[金属学及工艺—铸造]