Community Research and Development Information Service - CORDIS


It has been shown that the diameter of an inclusion could be determined by measuring the ultrasound attenuation at three different frequencies. Measurements using this principle have been carried out using alumina rods as waveguides into static liquid steel and in a flowing stream to simulate conditions in an outlet nozzle.

Twelve ceramic materials have been tested for suitability for use as ultrasound waveguides. Using tests for acoustic transmission, chemical stability, liquid steel reactivity and calculation of thermal shock, alumina and zirconia toughened alumina were identified and successfully tested with an inclusion detection system. Careful preheating was found to be necessary.

Water model studies have demonstrated the importance of probe rod geometry in pitch catch designs and neural networks have been successfully used to classify different sizes and types of particle. A new probe design using an air-cooled isothermal block and directly bonded transducers has been successfully tested under pilot plant conditions.

The project has been successful in understanding the use of ultrasonics in liquid melts, of developing prototype devices or assessing cleanness an demonstration that ultrasound can be used to detect inclusions in static and flowing steel, at least in short-duration experiments. The choice of refractory materials for use in waveguide rods continues to present problems. Progress has been made in data acquisition and signal processing. Particularly in the classification of attenuation events. ents.

Additional information

Bibliographic Reference: EUR 19351 EN (2000), 139pp.
Availability: Available from EUR-OP Sales agents
ISBN: ISBN 92-828-9159-3
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