Journal ArticleDOI
A three-dimensional model of the spray forming method
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TLDR
In this article, the shape of a spray-formed rod was analyzed at various spray forming conditions using the three-dimensional model, and the effects of spray forming parameters, such as spray distribution parameters, angular velocity of rotation, withdrawal velocity, spray angle, and eccentric distance on rod shape, were analyzed.Abstract:
A three-dimensional model has been formulated to calculate the shape of the general preform, using vector calculus. The shape of a rod, tube, plate, or irregular preform can be calculated at given spray forming conditions. The shape of a spray-formed rod was analyzed at various spray forming conditions using the three-dimensional model. The effects of spray forming parameters, such as spray distribution parameters, angular velocity of rotation, withdrawal velocity, spray angle, and eccentric distance on rod shape, were analyzed. The most important parameters affecting the shape of rods are the spray distribution parameters and the withdrawal velocity. The dynamic evolution of rod shape with a stepwise variation of the withdrawal velocity during spray forming was investigated. The effect of a stepwise change of the withdrawal velocity was the same as that of the scanning atomizer. The calculated surface profiles were compared with those of spray-formed 7075 aluminum alloy rods prepared on a pilot scale. The calculated results for the surface profiles were in agreement with those of the spray-formed rods.read more
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Journal ArticleDOI
The research status and development trend of additive manufacturing technology
TL;DR: In this article, a brief review of development courses of additive manufacturing technology and summarizes the development status and the application fields of additive Manufacturing technology, then, according to the manufacturing methods, it focuses on the principles and characteristics of several main additive manufacturing technologies.
Journal ArticleDOI
Solidification in Spray Forming
TL;DR: In this paper, a simple numerical model for the spray-formed grain size arising from the deposition of the various droplets in the spray and combines insights provided by the model with previous investigations of the phenomena occurring during and immediately after deposition to propose a comprehensive description of the important solidification behavior during spray forming.
Book
Spray Simulation: Modeling and Numerical Simulation of Sprayforming metals
TL;DR: In this paper, the authors provide an introduction to the various modelling and simulation techniques employed in spray forming, and show how they are applied in process analysis and development, wherever possible, they discuss theoretical results with reference to experimental data.
Journal ArticleDOI
Modelling the shape and thermal dynamics of Ni superalloy rings during spray forming Part 1: Shape modelling – Droplet deposition, splashing and redeposition
J. Mi,Patrick S. Grant +1 more
TL;DR: In this article, a numerical model has been developed to simulate the dynamic shape evolution of Ni superalloy rings during spray forming, which has been validated against experiments of spray forming large diameter IN718 alloy rings.
Journal ArticleDOI
Modelling the shape and thermal dynamics of Ni superalloy rings during spray forming. Part 2: Thermal modelling – Heat flow and solidification
J. Mi,Patrick S. Grant +1 more
TL;DR: In this article, a model was described to simulate the dynamic shape evolution of Ni superalloy rings during spray forming, concentrating on the effects of droplet splashing and redeposition.
References
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Book
Fundamentals of Solidification
W. Kurz,D. J. Fisher +1 more
TL;DR: In this article, Atom Transfer at the Solid/Liquid Interface Morphological Instability of a Solid/ Liquid Interface Solidification Microstructure: Cells and Dendrites SolidificationMicrostructure, Eutectic and Peritectic Solute Redistribution Rapid Solidization Microstructures Summary Appendices Symbols Index
Journal ArticleDOI
Analysis of the spray deposition process
TL;DR: An integral model for the Osprey tm spray deposition process has been developed using established theoretical principles in this paper, which describes the interconnected processes of droplet-gas interactions in flight and subsequent droplet consolidation on the substrate.
Journal ArticleDOI
Mathematical modeling of the isothermal impingement of liquid droplets in spraying processes
Gerardo Trapaga,Julian Szekely +1 more
TL;DR: In this article, a mathematical representation has been developed and computed results are presented describing the spreading of droplets impacting onto a solid substrate, which is of major practical interest in plasma spraying (PS) and in spray forming (SF) operations.
Journal ArticleDOI
Solidification progress and heat transfer analysis of gas-atomized alloy droplets during spray forming
Eon-Sik Lee,S. Ahn +1 more
TL;DR: In this article, the authors used the Newtonian heat transfer formulation coupled with the classical heterogeneous nucleation and specific solidification process to predict gas and droplet velocities, droplet temperature, and fractional solidification with flight distance during spray forming, and found that the corresponding solid fractions formed during recalesced, segregated, and eutectic solidifications are linearly related to the degree of undercooling.
Journal ArticleDOI
Fluid flow, heat transfer, and solidification of molten metal droplets impinging on substrates: Comparison of numerical and experimental results
TL;DR: In this paper, a mathematical representation has been developed, and computed results are presented describing the spreading and solidification of droplets impacting onto a solid substrate, which is of major practical interest in plasma spraying and spray forming operations.