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7 篇 会议

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检索条件"任意字段=Multiphase Phenomena and CFD Modeling and Simulationin Materilas Processes"

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multiphases phenomena and cfd modeling and simulationin Materials processes: Foreword

Multiphases Phenomena and CFD Modeling and Simulationin Mate...

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multiphase phenomena and cfd modeling and simulationin materilas processes

作者： Nastac, Laurentiu Li, Ben Concurrent Technologies Corporation Pittsburgh PA United States Washington State University Pullman WA United States

No abstract available

ISBN: (纸本)0873395700

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multiphase phenomena and cfd modeling and simulation in materials process

Multiphase phenomena and CFD modeling and simulation in mate...

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multiphase phenomena and cfd modeling and simulationin materilas processes

ISBN: (纸本)0873395700

The proceedings contain 45 papers from the conference on multiphase phenomena and cfd modeling and Simulation in Materials Process. The topics discussed include: Study on the air flow and heat transfer in gravel embankments in the permafrost areas between Qinghai and Tibet;improvement of flow modifiers in McGill heat pipes;an integrated model for microwave thermal processing;effects of magnetic fields and internal radiation on flow and solidification of oxide melts;effects of process variables on droplet heat transfer;a study of steel scrap movement and design of an asymmetric waveform spectrometer.

关键词： Materials science

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modeling of electroslag remelting of NI-CR-MO alloys

Modeling of electroslag remelting of NI-CR-MO alloys

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multiphase phenomena and cfd modeling and simulationin materilas processes

作者： Cefalu, Shawn A. Vanevery, Kent J. Krane, Matthew J.M. School of Materials Engineering Purdue University 501 Northwestern Avenue West Lafayette IN 47907 United States

ISBN: (纸本)0873395700

Segregation during electroslag remelting (ESR) of a nickel-chromium- molybdenum alloy (Ni-8 wt% Cr-25 wt% Mo) has been modeled. Features of the model include species transport and AC electromagnetic effects coupled with fluid flow, heat transfer, and solidification. The effect of varying ingot diameter and melt rate, on macrosegregation patterns, local solidification time, and liquid pool profiles obtained from this model are demonstrated. The results show that the macrosegregation in the ingots correlates to the filling velocity.

关键词： Electroslag remelting

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Validation and improvement of computer modeling of the lost foam casting process via real time X-ray technology

Validation and improvement of computer modeling of the lost ...

引用

multiphase phenomena and cfd modeling and simulationin materilas processes

作者： Sun, Wanliang Scarber Jr., Preston Littleton, Harry University of Alabama at Birmingham 917 Building 1530 3rd Avenue South Birmingham AL 35294-4480

ISBN: (纸本)0873395700

The Lost Foam Casting (LFC) process is relatively immature when compared to other casting processes. To make the process more robust, computer modeling is needed to reduce lead times and casting defects. In this study, metal filling of lost foam aluminum castings was visualized using state-of-art real time X-Ray technology. Metal filling of the lost foam casting was simulated using a commercial software package. The result of the computer simulation was compared with the results of the real time X-Ray visualization. Some of the computer simulation results agreed with the real time X-Ray visualization, but some did not. Based on other studies using real time X-Ray technology, new input variables, such as foam density variations, were developed for the computer modeling. With the new variables, modeling of the lost foam casting process becomes more realistic.

关键词： Casting

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cfd modeling and simulation applications for PAM-assisted casting of Ti-6Al-4V ingots and slabs

CFD modeling and simulation applications for PAM-assisted ca...

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multiphase phenomena and cfd modeling and simulationin materilas processes

作者： Nastac, Laurentiu Spadafora, Frank Crist, Ernie M. Concurrent Technologies Corporation Regional Enterprise Tower 425 Sixth Avenue Pittsburgh PA 15219 United States RMI Titanium Company 1000 Warren Ave Niles OH 44446 United States

ISBN: (纸本)0873395700

This paper describes the modeling techniques and the experimental and computer results for two casting processes that are under development and optimization. These processes are described as follows: 1) Electromagnetic stirring (EMS) during casting of Ti-6Al-4V round ingots using the plasma arc cold hearth melting (PAM) process: The purpose of EMS is to establish a single-melt PAM process capable of consistently producing as-cast ingots without helium porosity and also having no need for surface conditioning prior to secondary processing. The modeling approach is based on the numerical solution of Maxwell's equations, fluid flow, and heat transfer equations, and mesoscopic modeling of the grain structure. 2) Casting of Ti-6Al-4V slabs using the single-melt PAM process: The purpose of slab casting is to improve yield by eliminating an intermediate blooming step for converting round ingots to slabs. The modeling approach is based on the numerical solution of fluid flow and heat transfer equations. The effects of pouring and mold temperatures on the pool and temperature profiles were studied. Also, the torch effects (such as the torch standoff and its traversing path) on the pool and temperature profiles were investigated and the best-case scenario was used in the experiments. Evaluation results at RMI Titanium Company showed that the plates made from the slabs met the mechanical properties and microstructure requirements.

关键词： Plasma arc melting

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modeling dissolution in aluminum alloys

Modeling dissolution in aluminum alloys

引用

multiphase phenomena and cfd modeling and simulationin materilas processes

作者： Zoeller, Tracie Sanders Jr., T.H. Neitzel, G. Paul Woodruff Sch. of Mech. Engineering Georgia Institute of Technology 801 Ferst Drive Atlanta GA 30332-0405 United States Materials Science and Engineering Georgia Tech. 771 Ferst Drive Atlanta GA 30332-0245 United States

ISBN: (纸本)0873395700

As-cast aluminum alloy microstructures are highly segregated. Coring occurs when solute is rejected during solidification resulting in a non-uniform solute distribution across the dendrite arms. Furthermore, coarse constituent phases are formed in the interdendritic channels as a result of coring. These constituents are either soluble or insoluble and can form from the major solute elements, or the impurity elements iron and silicon. The dissolution of these constituents, or precipitates, is an important consideration in determining the microstructural evolution of an alloy. The properties of an alloy are significantly affected by the morphology of the precipitates. Precipitates can be either beneficial or detrimental to the properties of the alloy. Regardless of the nature of the precipitates present, it is useful to understand the dissolution process. A diffusion-limited dissolution model for planar precipitates is presented and compared to an analytical solution and to models in the literature. Experimental data for the dissolution of Al2Cu precipitates in a dilute alloy are compared to the proposed model, and found to have good agreement.

关键词： Aluminum alloys

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Mathematical modeling of a liquid metal feeding system for single belt casters

Mathematical modeling of a liquid metal feeding system for s...

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multiphase phenomena and cfd modeling and simulationin materilas processes

作者： Da Costa Fernandas, Frederico Defendi, Guilherme Antonio De Sousa Pena, Júlio César Da Cruz, Vangleik Ferreira Tavares, Roberto Parreiras Metallurgical Engineering Department Federal University of Minas Gerais Rua Espírito Santo 35 Minas Gerais 30160-030 Brazil

ISBN: (纸本)0873395700

Near-net-shape casting is an important area of research in the iron and steel industry today. Among the near-net-shape casting processes, the single-belt caster seems to be the most promising, since it is the only one that can achieve levels of productivity similar to those obtained with conventional continuous casting machines. One of the most important aspects in the single-belt casting is the feeding system used to deliver liquid metal over the belt. This system determines the velocity distribution and the levels of turbulence of the liquid metal and affects the quality of the strips. In the present work, a metal delivery system having a simple geometry was proposed. Using the cfd code CFX 5.6, a mathematical model to simulate three-dimensional turbulent fluid flow and heat transfer in that system has been developed. This model was used to analyze different configurations of the metal delivery system and the free surface shape of the fluid was also determined. A physical model of the feeding system was built and used to validate the predictions of the mathematical model. The fluid flow calculations have been validated by dye injection experiments and laser doppler anemometry. Measurements of the free surface levels have also been performed. These experiments provided supporting evidence for the predictions of the mathematical model.

关键词： Liquid metals

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