Vacuum Arc Remelting (VAR), as a key process in the production of titanium and titanium alloy ingots, has an irreplaceable position in the high-end manufacturing industry. This technology melts the end of the self-consuming electrode locally through arc heating in a vacuum or inert gas protection environment, and the molten droplets enter the crystallizer to form a melt pool, and then solidify sequentially to form ingots, providing a high-quality material foundation for aerospace, biomedical and other fields. In actual industrial production, titanium ingots usually need to be melted multiple times to ensure the uniformity of chemical composition and structural integrity, a process typically 2-3 times. The first melting converts the pressed electrode into a primary ingot, and then uses the ingot as a self-consuming electrode for secondary or even tertiary melting, which effectively promotes the uniform distribution of elements and the elimination of metallurgical defects through this process of repeated melting.
In recent years, with technological advancements, VAR technology has continued to innovate and develop. The emerging vacuum self-consuming arc melting and continuous casting equipment integrates the vacuum chamber, feed chamber and discharge chamber to form a complete production system. The vacuum chamber provides the necessary vacuum working environment for the melting device, and the reasonably arranged melting device and continuous casting device inside it realize the automatic continuous production of titanium alloy vacuum self-consuming arc melting and continuous casting process. This innovative design not only shortens the production cycle and improves production efficiency, but more importantly, ensures the stability of the metallurgical quality of ingots through automated production.
The growing demand for titanium alloys in high-end applications and the increasing requirements for material quality continue to drive the development of VAR segregation control technology. Especially in key application scenarios such as aerospace engine rotating components and medical implants, extremely high requirements are put forward for the fatigue performance and reliability of titanium alloy materials, and the allowable segregation defect size and quantity standards are constantly strict, which has become the core driving force of technological innovation.
It is worth mentioning that in the field of vanadium-titanium-based materials research, significant progress has also been made in related technologies. By improving the vacuum induction suspension melting technology, the researchers not only overcome the traditional problems such as severe alloy burnout and crucible corrosion, but also realize the alloy purification function, effectively inhibiting macroscopic component segregation. In this method, the raw materials with high melting point are placed in a water-cooled copper crucible, and the materials with low melting point are added through the feeder, and then mixed and melted after the high melting point materials are completely melted, ensuring the uniformity of the composition through repeated melting.
With the continuous deepening of understanding of VAR process and the continuous advancement of control technology, the metallurgical quality of titanium alloy ingots is steadily improving. The coordinated development of multi-scale simulation, intelligent control, new VAR technology and online monitoring technology is promoting titanium alloy VAR melting technology to a higher level. The integration and innovation of these technologies will better meet the growing quality demand for titanium alloy materials in high-end fields such as aerospace and biomedicine, and provide strong material support for manufacturing upgrading. Through continuous technological optimization and innovation, vacuum self-consumption melting technology will play a more important role in the development of high-end manufacturing industry in the future, injecting new vitality into the progress of China's new material industry.
