The effect of ultrasonic processing on solidification microstructure and heat transfer in stainless steel melt |
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Institution: | 1. Warwick Manufacturing Group, The University of Warwick, Coventry CV4 7AL, UK;2. School of Engineering, RMIT University, Melbourne, VIC 3000, Australia;3. Brunel Centre for Advanced Solidification Technology, Brunel University London, Uxbridge UB8 3PH, UK;4. Tomsk State University, Tomsk 634050, Russia;5. College of Engineering, Swansea University Bay Campus, Fabian Way, Swansea SA1 8EN, UK |
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Abstract: | The heat transfer in the ultrasonic processing of stainless steel melt is studied in this thesis. The temperature field is simulated when the metal melt is treated with and without ultrasound. In order to avoid the erosion of high temperature melt, ultrasound was introduced from the bottom of melt. It is found that the temperature of melt apparently increases when processed with ultrasound, and the greater the ultrasonic power is, the higher the melt temperature will be; ultrasonic processing can reduce the temperature gradient, leading to more uniform temperature distribution in the melt. The solidification speed is obviously brought down due to the introduction of ultrasound during solidification, with the increasing of ultrasonic power, the melt temperature rises and the solidification speed decreases; as without ultrasound, the interface of solid and mushy zone is arc-shaped, so is the interface of liquid and mushy zone, with ultrasound, the interface of solid and mushy zone is still arc-shaped, but the interface of liquid and mushy zone is almost flat. The simulation results of temperature field are verified in experiment, which also indicates that the dendrite growth direction is in accord with thermal flux direction. The effect of ultrasonic treatment, which improves with the increase of treating power, is in a limited area due to the attenuation of ultrasound. |
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Keywords: | Ultrasonic treatment Steel melt Heat transfer Temperature distribution Solidification microstructure Growth direction |
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