Journal Article10.1007/S40962-021-00603-W
Modeling Ablation Casting
Dashan Sui,Qingyou Han +1 more
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TL;DR: In this paper, an initial attempt in modeling ablation casting process is described, where material properties and boundary conditions are defined for calculating cooling curves and microstructural length scales in A356 alloy castings made using sand casting and ablation cast processes.
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Abstract: Research published in open literature on ablation casting has been mainly experimental. Modeling of this innovative technology is scarce. This article describes an initial attempt in modeling ablation casting process. Material properties and boundary conditions were defined for calculating cooling curves and microstructural length scales in A356 alloy castings made using sand casting and ablation casting processes. Model predictions were compared with published data on cooling curves and solidification times in an A356 alloy casting. The validated model was then used to predict unique solidification features associated with the ablation casting process, including the eutectic solidification time, shrinkage porosity formation, eutectic front morphology, the advancing rates of the eutectic front and the associated eutectic silicon morphology. Simulation results indicate that the progressive advancing ablation cooling is capable of reducing secondary dendrite arm spacing, modifying the eutectic silicon phase owing to the water quench effect, and eliminating shrinkage porosity using much smaller risers than usual if the ablation is correctly driven towards the risers.
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Citations
Effect of the Modified Ablation Casting Process on the Mechanical Properties and Microstructure of Near Eutectic Ai-Si Alloy
TL;DR: In this paper, a novel version of the well-known ablation casting process named as the direct water spraying (DWS) was introduced by applying the process on a simple geometry solidifying casting with a near eutectic A413.0 aluminum alloy.
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Features of A356 alloy solidified under water cooling conditions
TL;DR: In this paper, a simple quench method was used to study the effect of ablation water cooling on microstructural features and heat treatment response of A356 alloy and found that the micro-structural length scales obtained in this multicomponent alloy are comparable to that predicted by theories developed for binary alloys.
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Effect of the Type of Inorganic Binder on the Microstructure and Properties of AlSi7Mg Alloy Castings Made by Ablation Casting Technology
J. Kamińska,M. Angrecki,S. Puzio +2 more
TL;DR: In this paper , the effect of the type of binder and casting technology on the microstructure and properties of AlSi7Mg alloy castings is discussed and compared with three casting manufacturing technologies, i.e., conventional sand mold casting and cooling process, metal mold (die) casting, and sand mould casting with ablation breakdown of mould and cooling of castings.
References
Effect of power ultrasound on solidification of aluminum A356 alloy
TL;DR: In this article, the effect of ultrasonic vibration on the nucleation and growth of aluminum alloy A356 melt was evaluated and it was shown that cavitations-induced heterogeneous nucleation plays a more important role than dendrite fragmentation in the formation of globular grains.
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Structure and properties of aluminium-silicon eutectic alloys
H.A.H Steent,A Hellawell +1 more
TL;DR: In this paper, the microstructures of directionally frozen specimens were examined to determine the growth conditions which produced primary crystals of aluminium or silicon, or neither and to ascertain the conditions which caused a structural change in eutectic silicon from a flake to fibre morphology.
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The modification of aluminium-silicon alloys with strontium
D.C. Jenkinson,L.M. Hogan +1 more
TL;DR: In this article, a region of coupled growth, in which modified eutectic alone grows, has been delineated and the effect of strontium level on the shape of this region determined.
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Modified Silicate Binders New Developments and Applications
TL;DR: In this article, the advantages and benefits of new silicate binders and processes are shown based on the analysis of the various properties of sand cores and castings, and the air-assisted warm core box process with one-and two-component inorganic binders which successfully replaced widely used cold box process and organic binders in the mass production of aluminum castings.
51
Fluidity of Alloys Under High-Pressure Die Casting Conditions: Flow-Choking Mechanisms
Qingyou Han,J. Zhang +1 more
TL;DR: In this paper, the microstructure in the fluidity test coupons made using a 125-ton HPDC machine was characterized and it was shown that a large amount of pre-solidified dendrites (PSDs) are collected in the runner adjacent to the in-gate, forming a PSD core with a thin layer of PSDless or PSD-free region near the surfaces of the runner due to the Magnus effect.
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