Solidification occurs in several material processing methods, such as in casting, welding, and laser additive manufacturing of metals, and it controls the nanoand microstructures and the overall properties. Recent advances in experimental and computational modeling techniques have made it possible to more e ectively study atomistic and microscale mechanisms that control the solidification struc...

A finite-element model has been developed to predict the evolution of temperature, stress, and shape of 10-mm diameter molten steel droplets solidifying against a water-cooled copper chill plate. The elastic-viscoplastic stress model accounts for thermal linear expansion / contraction behavior, creep, and phase transformations that vary with carbon content. Thermal contraction causes the quench...

Molten system Na3AlF6 ? SiO2 was examined by high temperature NMR. Further characterizations of the samples prepared Rapid Solidification Processing (RSP) technique and spontaneous solidification were performed X–ray diffraction solid state The solubility in molten cryolite immiscibility phenomenon observed. Using thermogravimetric analysis, weight losses detected, which could be attributed to ...

In this paper, a complete three-dimensional numerical model of mold filling and solidification of steel ingots is presented. The risk of powder entrapment and defects formation during filling is analyzed in detail, demonstrating the importance of using a comprehensive geometry, with trumpet and runner, compared to conventional simplified models. By using a case study, it was shown that the simp...

Compositionally graded bulk materials of organic polymer blends were prepared by using nonequilibrium self-organization processes with a uniaxial thermal gradient (Bridgman method). The Bridgman method was firstly applied to prepare two kinds of polymeric compositionally graded materials: a polymer/low molecular weight additive system (poly(e-caprolactone) (PCL)/ 4,49-thiodiphenol (TDP)) and a ...

In this paper, model based control of solidification is studied. A one-dimensional model that describes the dynamic response of the solidification rate for a pure substance is developed. The solidification of a metal column is controlled in order to solidify at a desired rate. The manipulated variable is the power to the heater at the top of the casting. A linear PI-controller is implemented an...

The Directional Solidification is a very important technique for growing high quality multi-crystalline silicon at large scale for PV solar cells. The physics governing the growth of multi-crystalline silicon in the Directional Solidification System involves complex non-linear transport phenomena including but not limited to heat transfer, solidification, thermal stress development, and the for...

New processes have been developed in the last years to produce near net shape steel products by continuous casting. This work deals with the analysis of the effects of liquid core reduction during the solidification in the microstructure of thin slabs obtained by continuous cast process. An equipment able to simulate the liquid core reduction during the solidification was projected and construc...

heat transfer mechanisms and the solidification process are simulated for a continuous casting machine and the geometric shape of the liquid pool is predicted considering different conditions. a heat transfer and solidification model is described for the continuous casting of steel slabs. the model has been established on the basis of the technical conditions of the slab caster in the continuou...