By Laurentiu Nastac, Baicheng Liu, Hasse Fredriksson, Jacques Lacaze, Chun-Pyo Hong, Adrian Catalina, Andreas Buhrig-Polaczek, Charles Monroe, Adrian Sabau, Roxana Elena Ligia Ruxanda, Alan Luo, Subhayu Sen, Attila Diószegi
This assortment encompasses the subsequent 4 parts: (1) Solidification processing: theoretical and experimental investigations of solidification strategies together with castings solidification, directional solidification of alloys, electromagnetic stirring, ultrasonic cavitation, mechanical vibration, lively cooling and heating, powder bed-electron beam melting additive production, and so forth. for processing of metals, polymers and composite fabrics; (2) Microstructure Evolution: theoretical and experimental reports regarding microstructure evolution of fabrics together with prediction of solidification-related defects and particle pushing/engulfment facets; (3) Novel Casting and Molding approaches: modeling and experimental elements together with excessive strain die casting, everlasting casting, centrifugal casting, low strain casting, 3D silica sand mildew printing, etc.; and (4) forged iron: all elements regarding forged iron characterization, computational and analytical modeling, and processing.
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Extra info for Advances in the Science and Engineering of Casting Solidification: An MPMD Symposium Honoring Doru Michael Stefanescu
4 Conclusions A multi-scale model for the ultrasonic treatment of liquid metals is presented in this study. The bubble concentration for the flow in a launder with baffles to create recirculation zones in high cavitation activity regions is studied with an improved version of the full cavitation model derived from the Keller-Miksis equation. The optimal baffle distance for both liquid water and aluminium has been found to be at one wavelength of the forcing frequency, implying that resonance with the driving frequency is a desired trait for ultrasonic cavitation treatment of liquid metal.
Secondary dendrite arms are formed behind the tip and the distance between the secondary dendrite arms are direcectly related to the tip radius. In the expression for the tip radius the diffusion constant is included and the smaler the diffusion rate is the finer should the structure be. One could then expect a finer structure in the samples processed under microgravity conditions where the diffusion rate are smaler. However the opposite is observed. During the solidification process a coarsening of the structure occurs.
A larger bubble concentration is desired, since higher cavitation activity – occurring as more bubbles collapse – is thought to promote better grain refinement. Figure 6. Bubble mass fraction along the axis of the sonotrode for water after a run time of 20 s. Mass fraction values are taken along the axis of the sonotrode. Figure 7. Bubble mass fraction across the launder for water after a run time of 20 s. Mass fraction values are taken along the axis of the launder. Figure 8. Bubble mass fraction along the axis Figure 9.