Ultrasonic grain refinement in aluminium alloysNovel industrial ultrasonic grain refinement technology without adding Titanium Boron grain refiner!
Ultrasonic grain refinement without TiB
Various techniques are available for enhancing the microstructure and grain refinement in aluminium alloys, magnesium, zinc, copper for instance, there is a strong correlation between grain size and casting temperature; however, significant improvements can be achieved using ultrasonic treatment. Two mechanisms contribute to this process.
During the high-pressure cycle of the cavitation process, collapsing bubbles result in localised high temperatures and pressures. Temperatures can exceed 1000 K while pressures can exceed 400 MPa; rapid cooling rates also occur. The effects of this are twofold: many nucleation sites are formed inducing finer grain sizes, and the energies generated destroy dendritic structures that would otherwise form.
Ultrasonic assisted industrial continuous twin roll casting
Twin roll casting converts the melt into aluminium strip for subsequent cold rolling operations. The process holds several challenges, in particular, coarse columnar grains, chemical segregation at the strip centre, microstructural gradients and inhomogeneity.
A breakthrough in industrial ultrasonic casting can address these problems. In particular the technique offers a substantial reduction in grain size, elimination of central intermetallic needle, and improved homogeneity. Furthermore, the process removes the need for argon degassing.
Results & Applications:
- Improved metal homogenization, grain refinement and mixing of new alloys.
- Excellent ultrasonic degassing results (defragments and wetted inclusions)
- Excellent results after vibrating ‘in sump’ of a vertical Wagstaff DC caster.
- Excellent results on a Bruno Presezzi continuous casting line.
- Improved micro crystallization and alloy characteristics in casting.
- Friction reduction between a tool (e.g. casting, drawing, extruding, molding).
- Improved surface finish.
Ultrasonic degassing & grain refinement offers numerous advances over conventional methods offering substantial improvements in the properties of the final products, along with reduced costs and environmental impact.
Twenty years of software development has been invested to create the first generation of powerful ‘no-standing-waves’ series of NIMA generators. Only our technology is able to treat large volumes of molten metals and glass.
NIMA generators use low energy, typically 1000 Watt per generator.
We have developed a new series of special grade, long life, ceramic sonotrodes for any temperature and alloy up to 1,800 °C.
SIALON CERAMICS Ltd
71-75 Shelton Street | Covent Garden
SIALON CERAMICS Ltd
Østerbrogade 226 st. tv.
Telephone: +(45) 92 45 57 28