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Kaveh Dargahi Noubary (Karlsruhe Institute of Technology (KIT))18/06/2019, 17:50PosterDue to the significant effects of the underlying microstructure on the material properties, accurate understanding of microstructure evolution in solidification processes has attracted lots of attentions in recent years. The low melting point of the ternary eutectic Bi-In-Sn alloy has lead to accurate in situ observations of its solidification process in experimental studies. Although these...Go to contribution page
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Mr Gildas Guillemot (CEMEF - Mines ParisTech)18/06/2019, 17:51PosterThe industrial sectors of energy and transport require the development of equipment with high levels of safety and performance. These requests compel steelmakers to develop cast products with a high microstructural, chemical and mechanical homogeneity. As part of the SOFT-DEFIS project, collaboration between academic and industrials partners has been developed to optimize steel ingots quality...Go to contribution page
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Michael Kellner (Karlsruhe Institute of Technology (KIT))18/06/2019, 17:52PosterThe properties of a material are mainly defined by their chemical composition and by the underlying microstructure. Depending on the process conditions during the directional solidification and the applied material system different microstructures evolve, which are suitable for the demands of specific applications. Instable growth conditions during the directional solidification can lead to an...Go to contribution page
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Prof. Jiang Wang (Shanghai University)18/06/2019, 17:53PosterMagnetic fields have varieties of ubiquitous influence on nucleation and growth in solidification. As long as plenty of experimental phenomenon and results respectively have been revealed and retrieved, the mechanism of effect of magnetic fields on nucleation and growth in solidification keeps ambiguous. Not only thermodynamics mainly clarifies mechanism of growth qualitatively in...Go to contribution page
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Can Huang (Access e.V., Aachen, Germany)18/06/2019, 17:54PosterLow pressure turbine blades (LPT) made by centrifugal casting from titanium aluminides require demanding process control, as to achieve desired solidification microstructures. The columnar-to-equiaxed transition (CET) and the related texture are of special interest. In the joint European Project โGRADECETโ they were investigated in ฮผg, 1g and hyper-g conditions. Solidification experiments of...Go to contribution page
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Julien Zollinger (Institut Jean Lamour)18/06/2019, 17:55PosterThe columnar growth of Ti-48Al-2Nb-2Cr alloy was investigated using power down directional solidification experiments under various gravity conditions, ranging from micro-gravity to 20 g. The g-vector always pointed in direction opposite to the growth direction. The columnar dendrite morphology and primary spacing was analyzed in longitudinal and transverse sections and for selected...Go to contribution page
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Alexandre Viardin (ACCESS e.V.)18/06/2019, 17:56PosterThis second paper addresses the phase field modeling of columnar dendritic growth for different scenarios of fluid flow developing in response to gravitational forces. For this the experimental Ti-48Al-2Cr-2Nb alloy has been simplified to a binary alloy Ti-48 at.% Al. The 2D simulations confirm the decrease of the primary dendrite arm spacing with increasing gravity, nearly matching the...Go to contribution page
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Moritz Eickhoff (Department for Industrial Furnaces and Heat Engineering of the RWTH Aachen University)18/06/2019, 17:57PosterThe modelling of solidification processes in combination with fluid flow is one application of ANSYS Fluent. The solidification is modelled with the enthalpy porosity technique. Therefore, the fluid flow is damped similar to a flow through a porous media of dendrites. For the numerical simulation of remelting processes like electro slag remelting or vacuum arc remelting ANSYS Fluent is used...Go to contribution page
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Oriane Senninger (CEMEF)18/06/2019, 17:58PosterThe formation of eutectic microstructures, composed of two phases or more, is often encountered during the solidification of industrial alloys. Fraction and characteristics of this structure have consequences on the subsequent phase transformations, mechanical strength and final end-use properties of metallic pieces. Consequently, estimation of eutectic growth kinetics is required in order to...Go to contribution page
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Mr Jean-Marc Debierre (Aix-Marseille University)18/06/2019, 17:59PosterSilicon is widely used in the industry of solar panels. During the manufacturing process, the molten silicon is solidified into ingots. These ingots are cut into very thin layers which are assembled into solar cells. It turns out that the solar cells efficiency depends on the solidification process and the final microstructure of the ingots. Several experimental studies of solidification...Go to contribution page
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Hani Henein (University of Alberta)18/06/2019, 18:01PosterNear eutectic Al-Cu droplets were rapidly solidified by Impulse Atomization. A wide range of microstructural scales was obtained at different cooling rates and undercoolings. The micrographs of the investigated samples revealed two distinct zones of different structural morphologies: An undulated eutectic morphology developed during recalescence following the single grain nucleation and a...Go to contribution page
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Guangyu YANG (State Key Laboratory of Solidification Processing, Northwestern Polytechnical University)18/06/2019, 18:02PosterMicrostructures, growth orientation and the room temperature mechanical properties of Mg-14.61Gd alloy were investigated by using directional solidification technology and CAFE simulation method under G=30K/mm and v=10-200ฮผm/s. The experimental alloys were mainly consisted of primary ฮฑ-Mg phase and (ฮฑ-Mg+Mg5Gd) eutectic phase under all the growth conditions, which is consistent with the...Go to contribution page
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Ueno Kensho (The University of Tokyo)18/06/2019, 18:03PosterSemi-grand canonical Monte Carlo (SGCMC) simulations are performed to derive thermodynamic properties of binary alloy from atomistic-based simulations. Particularly, solidus and liquidus compositions are directly derived for Fe-Cr alloy described by two different EAM potentials. Although the SGCMC simulation can derive relationship between the free energy and composition at any temperature...Go to contribution page
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Geunwoo Kim (Hokkaido University)18/06/2019, 18:04PosterThe preferred growth direction of crystal in solidification of metallic materials is mainly determined by anisotropy of solid-liquid interface energy, g(n), where n represent the crystallographic orientation normal to the solid-liquid interface. The anisotropy of g(n) is described by anisotropy parameters e1 and e2 that characterize <100> and <110> growth, respectively. Effect of e1 has been...Go to contribution page
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Shinji Sakane (Kyoto Institute of Technology)18/06/2019, 18:05PosterThermal-solutal convection necessary occurs during the terrestrial solidification of alloys. Thanks to the recent progress in the in-situ observation technique using X-ray radiography, the direct observation of dendrite growth under high temperature has been made possible. In the in-situ observation, however, it is difficult to see the liquid flow during the dendrite solidification. In order...Go to contribution page
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Jaehoon Lee (Hokkaido University)18/06/2019, 18:06PosterMicrosegregation has a great influence on properties of materials such as mechanical and corrosive properties and it entirely depends on size and morphology of solidification microstructure. Although a number of efforts have been devoted to understanding and controlling of microsegregation in alloy systems, little has been clarified about microsegregation behavior at grain boundaries formed by...Go to contribution page
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Yukimi OKA (Hokkaido Unicversity)18/06/2019, 18:07PosterComputational simulations of solidification microstructures have contributed to understanding of time evolutions of complex morphologies of crystals in a variety of solidification processes. A phase-field method is an effective method in simulating the solidification microstructures such as a dendrite structure, a typical morphology of growing solid in solidification of metals. Importantly,...Go to contribution page
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Takahisa Kinoshita (Hokkaido University)18/06/2019, 18:08PosterAfter solidification, grain growth occurs in the metallic materials, in general. It is very important to understand grain growth as well as solidification in order to control the mechanical properties of metallic materials. Abnormal grain growth(AGG), in which some grains preferentially grow to be extremely large, often occurs during cooling and isothermal holding at high temperatures after...Go to contribution page
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Hideyuki Yasuda (Kyoto University)18/06/2019, 18:09PosterTime-resolved in situ tomography of dendritic growth in Feโ0.45 mass% C carbon steel was performed using synchrotron radiation X-rays at SPring-8 synchrotron radiation facility (Japan) with improvement of the image quality using a physics-based filter. The voxel size of the reconstructed image was approximately 6.5 ฮผm ร 6.5 ฮผm ร 6.5 ฮผm, and the time resolution (duration of 360ยฐ rotation)...Go to contribution page
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Prof. Mihaela Stefan (Montauniversitรคt leoben)18/06/2019, 18:10PosterThe growth of faceted crystals occurs often in nature and industry, involving always the presence of flow. Insulin, silicon, pyrite, quartz, gallium are only few examples of faceted crystals. The present paper presents a numerical model for the simulation of facetted crystal growth, taken into account the incidence of flow. The growth in facetted crystals is the results of interface kinetics...Go to contribution page
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Yi Qiu (Brunel University London)18/06/2019, 18:11PosterTwin roll casting (TRC) is an energy efficient way of producing Mg alloy sheet for lightweight applications. However, unfavourable microstructural features, such as columnar grains and centreline segregation, are present in the as-cast alloy sheet. By modelling the effects of casting parameters, melt conditioning and material parameters on microstructure development, feedback can be provided...Go to contribution page
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Dr JUN LI (Shanghai Jiao Tong University)18/06/2019, 18:12PosterThe endogenous inclusion during solidification may generate from the combination of solute and non-metallic element, i.e, O, S, therefore the formation of such inclusion would take effect to global macrosegregation. To legitimately examine the interaction between endogenous inclusion and macrosgregation, an inclusion-combined macrosegregation model, which coupling the inclusion growth theory...Go to contribution page
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Yasumasa Mitsuyama (Kyoto Institute of Technology)18/06/2019, 18:14PosterPermeability for flow of interdendritic liquid is a very important parameter in a macrosegregation prediction during alloy solidification. For systematical permeability prediction in various solidification conditions, a numerical simulation coupling a phase-field method and computational fluid dynamics would be the most promising approach. In our previous study, we have developed a...Go to contribution page
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Jun Li (Department of Engineering, University of Leicester)18/06/2019, 18:16PosterSolidification cracking is an important issue during welding, casting and some of the additive manufacturing process. In order to illuminate the failure mechanisms, solidification cracking during arc welding of steel are investigated in situ with high-speed, high energy, synchrotron X-ray radiography approach. Analysis of the in situ radiography sequence revealed the solidification...Go to contribution page
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Li Wen (Huazhong University)18/06/2019, 18:18PosterDue to start-up and shut-down operations of engine, TiAl structural components usually undergo not only static but also cyclic mechanical loading. The crack propagation mechanisms of ฮณ-TiAl under two types of loading are studied in this work to reveal the differences of the mechanisms under constant strain rate and cyclic loading. Since the crack prefers to nucleate at the interface, two types...Go to contribution page
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Nathalie Mangelinck (University of Sรฃo Paulo)18/06/2019, 18:19PosterThe study is focused on the influence of solidification thermal parameters upon the evolution of the microstructure (either cells or dendrites) of an Al-3wt%Mg-1wt%Si ternary alloy. It is well known that the application properties of metallic alloys will greatly depend on the final morphology of the microstructure. As a consequence, various studies have been carried out in order to determine...Go to contribution page
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