NbTi合金锻造工艺的优化研究

Optimization of NbTi alloy forging process

摘要:

超导材料已广泛应于高技术领域,NbTi合金作为一种典型的低温超导材料,在高技术领域(高能物理、受控热核聚变、储能、磁悬浮等)中占有极其重要的地位,已成为一种不可替代的新材料广泛应用于能源、交通、医疗、高能物理等重要领域。通过模拟仿真(DEFORM计算)结合实际生产,研究了NbTi合金的锻造这一复杂动态的接触过程,得到了 NbTi合金锻造组织的演化规律,确定了组织均匀的NbTi合金锻造工艺。结果表明：通过模拟仿真发现,采用小变形量,三分之一边长下镦的方式并增加换向拔长,可使NbTi合金的不同位置的变形较为均匀,大面积消除满砧镦拔带来的变形死区,通过实验验证最终生产出符合技术标准的NbTi合金棒材。与美国华昌公司的NbTi合金棒材成分、微观组织和XRE作对比,发现成分的极差、微观组织的均匀性和无损探伤均优于美国华昌公司生产的NbTi棒材,为NbTi合金的生产提供实际参考。

Abstract:

The superconducting materials have been widely used in the high-tech fields, e.g. high-energy physics, controlled thermonuclear fusion, energy storage device and maglev etc. The NbTi alloy as a typical low-temperature superconducting material occupies a very important place. By simulated calculation with DEFORM, the dynamic behavior of the forging process has been studied. Further, combined with practical process, the evolution of the microstructure has been obtained, and the preparation technology of the NbTi alloy bars has been acquired. According to the results of simulated calculation, it indicates that the NbTi alloy is deformed homogeneously under a small deformation range, the 1/3 length press and the reversal stretch, which eliminates effectively the deformation dead zone. This optimized technology used to produce NbTi alloy bars, which is well satisfied with the related requirement, has been perfomed in industrial production.