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检索条件"主题词=microstructure modeling"

共 113 条记录，以下是71-80 订阅

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Simulating nucleation in elastically anisotropic crystal of arbitrary microstructure

Simulating nucleation in elastically anisotropic crystal of ...

引用

International Conference on Solid-Solid Phase Transformations in Inorganic Materials (PTM 2005)

作者： Shen, C. Simmons, J. P. Wang, Y. Ohio State Univ Dept Mat Sci & Engn Columbus OH 43210 USA

The elastic energy of a coherent nucleus interacting with an arbitrary microstructure is derived for elastically anisotropic solids. The formula is incorporated into the classical nucleation theory. By using the explicit nucleation algorithm of the phase field method we simulate nucleation in square -> square and square -> rectangle transformations. The results agree with those obtained using the Langevin approach.

关键词： coherent nucleation elastically anisotropic solid microstructure modeling explicit nucleation algorithm Langevin force

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Numerical Simulation of Hot Rolling

Numerical Simulation of Hot Rolling

引用

7th International Conference on Physical and Numerical Simulation of Materials Processing (ICPNS 2013)

作者： Kawalla, Rudolf Schmidtchen, Matthias TU Bergakad Freiberg Inst Met Forming Bernhard von Cotta Str 4 D-09596 Freiberg Germany NIST MISIS Dept Plast Deformat Special Alloys RU-117936 Moscow Russia

ISBN: (纸本)9783037857281

In the present paper actual demands for modem simulation strategies for hot rolling are discussed. The main focus of the discussion is on material flow simulation for hot rolling and the computation of material inhomogeneities. An overview on simulation techniques for material flow and microstructure evolution is given. Approaches for new simulation strategies which give fast results with a high modeling depth are discussed. As a result of actual investigations a fast model for material flow is presented.

关键词： hot rolling microstructure modeling strip rolling long products inhomogeneity

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A numerical model for the description of massive and lamellar microstructure formation in gamma-TiAl

A numerical model for the description of massive and lamella...

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5th International Conference on Processing and Manufacturing of Advanced Materials

作者： Jacot, A. Rostamian, A. Ecole Polytech Fed Lausanne Computat Mat Lab CH-1015 Lausanne Switzerland Ecole Polytech Fed Lausanne Calcom ESI Parc Sci CH-1015 Lausanne Switzerland

ISBN: (纸本)9780878494286

A phenomenological modeling approach has been developed to describe the massive transformation and the formation of lamellar microstructures during cooling in gamma titanium aluminides. The modeling approach is based on a combination of nucleation and growth laws which take into account the specific mechanisms of each phase transformation. Nucleation of both massive and lamellar gamma is described with classical nucleation theory, accounting for the fact that nuclei are formed predominantly at alpha/alpha grain boundaries. Growth of the massive gamma grains is calculated with a mathematical expression for interface-controlled reactions. A modified Zener model is used to calculate the thickening rate of the gamma lamellar precipitates. The model incorporates the effect of particle impingement and rapid coverage of the nucleation sites due to growth. The driving pressures of the phase transformations are obtained form Thermo-Calc based on actual temperature and matrix composition. The model permitted investigating the influence of alloy chemistry, cooling rate and average alpha grain size upon the amount of massive gamma and the average thickness and spacing of the lamellae. Calculated CCT diagrams were compared with experimental data collected from the literature and showed good agreement.

关键词： intermetallics titanium aluminides massive transformation lamellar transformation microstructure modeling

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Simulation of the process of hot rolling of seamless tubes

Simulation of the process of hot rolling of seamless tubes

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5th International Conference on Processing and Manufacturing of Advanced Materials

作者： Carvalho, R. N. Ferreira, M. A. C. Santos, D. B. Barbosa, R. V&M Brasil Qual & R&D Mandrel Mill Dept Av Olinto Meireles 65 BR-30640010 Belo Horizonte MG Brazil Univ Fed Minas Dept Met & Mat Engn BR-30160030 Belo Horizonte MG Brazil

ISBN: (纸本)9780878494286

Seamless tubes are manufactured, as it is well known, via continuous mandrel rolling process. A billet is first pierced, then the hollow is reduced and rolled with mandrel at temperatures higher than 1000 degrees C. After mandrel extraction, the hollow can either cool down to room temperature or be directly charged in an intermediate furnace for re-austenitization. Finally, the tube is finished in a stretch-reducing mill to several gauges. The thermomechanical process is complex allowing little flexibility along the line. The aims of this paper are a) to describe the industry schedule in terms of simple process variables and b) to simulate this process via numerical and physical models. The latter uses torsion testing as experimental technique. It is shown that good agreement is obtained between industry results and predictions from the numerical model. Torsion experiments have produced somewhat larger predictions for ferrite grains sizes, however. This is mostly attributed to the necessary simplifications made to the mechanical testing experiments due to restrictions in maximum strain rates and shortest dwell times achievable with thermomechanical simulators.

关键词： hot torsion testing seamless tube rolling microstructure modeling

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Development of an Automated Property Simulation Tool for Direct Aged Alloy 718 Engine Disk Forgings 9

Development of an Automated Property Simulation Tool for Dir...

引用

9th International Symposium on Superalloy 718 and Derivatives - Energy, Aerospace, and Industrial Applications

作者： Stockinger, Martin Stanojevic, Aleksandar Wieser, Volker Raninger, Peter Voestalpine BOHLER Aerosp GmbH & Co KG Kapfenberg Austria Voestalpine BOHLER Edelstahl GmbH & Co KG Kapfenberg Austria Mat Ctr Leoben Leoben Austria

ISBN: (纸本)9783319894805;9783319894799

As the optimization of highly demanding engine parts like engine disks pushes the materials used to their limits, the estimation of the material properties becomes increasingly important. The complex interactions of strengthening mechanisms in direct aged (DA) Alloy 718 forgings demand detailed modeling of each mechanism. As some strengthening mechanisms are influenced during the billet processing it is essential to consider the forging stock manufacturing in the design process of forged engine disks. Therefore, a finite element analysis of the billet processing was incorporated in an existing simulation chain of the closed die forging process of engine disks. It includes all thermo-mechanical operations after vacuum arc remelting, i.e. homogenization, upsetting, drawing and radial forging of the billet as well as prepressing, forging and heat treatment of a disk. In order to implement the local variations of microstructure caused by the billet processing a newly developed grain class model was applied. Furthermore a duplex microstructure, which is often present in the surface region of the billet, was considered using the grain class model. For a sound precipitation modeling the local temperature history of the whole simulation chain was considered in the thermo-kinetic software tool MatCalc. After parameterization of the MatCalc model, parameters for the precipitation, solid solution and grain boundary contribution to the total yield strength was calculated. For the determination of the DA-effect a semi-empirical, deterministic model was developed. The established, automated simulation chain takes all mentioned mechanisms into account and calculates the local yield strength of the forged engine disk.

关键词： Alloy 718 microstructure modeling Mechanical properties modeling Simulation chain

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modeling of dual-phase grain structure in Ti-6Al-4V during isothermal and non-isothermal heat treatment using cellular automata

Modeling of dual-phase grain structure in Ti-6Al-4V during i...

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5th International Conference on Recrystallization and Grain Growth (ReX&GG V)

作者： Krumphals, Alfred Poletti, Cecilia Warchomicka, Fernando Stockinger, Martin Sommitsch, Christof Graz Univ Technol Inst Mat Sci & Welding Christian Doppler Lab Mat Modelling & Simulat A-8010 Graz Austria Vienna Univ Technol Inst Mat Sci & Technol Vienna Austria Bohler Schmiedetech GmbH & Co KG Kapfenberg Austria

ISBN: (纸本)9783037856888

In the titanium alloy Ti-6Al-4V the dual-phase grain structure, which forms during thenno-mechanical processing, is of high importance due to its effect on the materials mechanical properties. In general the most significant microstructural parameters are the amount of alpha and beta phase as well as their grain size. For this reason a new cellular automata method (CA) was developed to predict the evolving grain structure during isothermal and non-isothermal heat treatment. The probabilistic CA model is based on the diffusion controlled movement of grain and phase boundaries. During temperature changes an algorithm is adjusting alpha and beta phase fraction to maintain equilibrium phase values. Hence, the CA is capable to calculate grain coarsening as well as grain growth and shrinking in the two-phase area while heating and isothermal holding at forging temperature. The initial microstructure can be imported from virtual created microstructures, real micrographs and EBSD-maps. Model output includes mean grain diameters, grain size distributions and virtually simulated microstructures which can be easily compared with real micrographs. The predicted microstructures are showing a good correlation to data from literature and experimental results.

关键词： microstructure modeling grain growth Ti-6Al-4V cellular automata

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microstructure Based Simulation of Clay Composites Thermal Properties

Microstructure Based Simulation of Clay Composites Thermal P...

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4th International Renewable and Sustainable Energy Conference (IRSEC)

作者： Lahrichi, Anas Ennaceri, Houda Bentamy, Anas Khaldoune, Asmae Akhawayn Univ Sch Sci & Engn Ifrane Morocco

ISBN: (纸本)9781509057139

The aim of this study is to simulate thermal properties of Bensmim clay-wool composite through using microstructure based finite element modeling. These materials have been chosen due to their low cost and local availability. Cutting edge software tools that implement finite element methods will be used in order to first generate the 3D microstructure of the composites and then simulate the thermal properties as a second step. A validation of results is then performed through comparison with previous experimental studies in literature. The simulated thermal conductivity of the clay wool composite is 0.92 W/m-K which is close to the experimental value of 0.89 W/m-K. This study shows that microstructure based modeling of thermal properties of composites is a reliable way to explore new designs and get high fidelity measures of thermal conductivity.

关键词： FEM microstructure modeling ANSYS Digimat

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Representative volume element size for accurate solid oxide fuel cell cathode reconstructions from focused ion beam tomography data

Representative volume element size for accurate solid oxide ...

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62nd Annual Meeting of the International-Society-of-Electrochemistry

作者： Joos, Jochen Ender, Moses Carraro, Thomas Weber, Andre Ivers-Tiffee, Ellen KIT IWE D-76131 Karlsruhe Germany Heidelberg Univ Inst Appl Math D-69120 Heidelberg Germany KIT CFN D-76131 Karlsruhe Germany

Electrode performance in solid oxide fuel cells is strongly affected by its microstructure characteristics. A three-dimensional reconstruction of a mixed-conducting La0.58Sr0.4Co0.2Fe0.8O3-delta (LSCF)-cathode is introduced, which gives a detailed description thereof. At first, the multistep procedure of FIB/SEM (focused ion beam/scanning electron microscopy) tomography is analyzed, error sources are identified and measures taken against are presented. Special emphasis is turned on adequate SEM image resolution, on representative volume elements essential for trustworthy results and on important aspects of the numerical simulation. Our corrected reconstruction data set represents a volume of similar to 2800 mu m(3) and contains similar to 96 x 10(6) voxels. This data set is then used for calculating: (i) volume-specific surface area of the LSCF cathode, (ii) volume/porosity fraction, and (iii) tortuosity of LSCF and pores at a constant base area, but for an increasing height of the reconstructed electrode. Moreover, the course of these microstructure parameters is calculated independently for three representative volume elements. (C) 2012 Elsevier Ltd. All rights reserved.

关键词： microstructure modeling Focused ion beam tomography Microstructural quantification SOFC cathode Representative volume element

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Investigations on Interaction between Recrystallization and Precipitation at Finishing Steps of Seamless Tube Rolling

Investigations on Interaction between Recrystallization and ...

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4th International Conference on Recrystallization and Grain Growth (ReX & GG 2010)

作者： Carvalho, R. N. Ferreira, M. A. C. Santos, D. B. Barbosa, R. V&M Brasil Vallourec Res Belo Horizonte Av Olinto Meireles 65 BR-30640010 Belo Horizonte MG Brazil Univ Fed Minas Gerais Dept Met & Mat Engn BR-31270 Belo Horizonte MG Brazil

ISBN: (纸本)9783037853900

Conventional controlled rolling is normally used in a hot strip mill in order to refine the microstructure and, consequently, to meet a good combination of mechanical strength and toughness in low carbon steels. Nb microalloying are used for this purpose once this rolling technique requires the occurrence of strain induced precipitation before that any recrystallization process takes place. In a hot strip mill, the transfer time between roughing and finishing steps is considered fast enough to keep all Nb, previously solubilized in plate furnace, in solid solution just before finishing. As a consequence, the thermodynamic driving force required for strain induced precipitation remains high, accelerating its kinetics and preventing the occurrence of recrystallization. On the other hand, in a seamless tube rolling, the transfer time between roughing and finishing steps is about 20 times longer than in a hot strip mill. As a consequence, Nb can precipitate in the recrystallized austenite after roughing, decreasing the driving force for strain induced precipitation at finishing. Transmission electron microscopy investigations on samples simulating the material just before finishing rolling in a seamless tube mill show that both grain boundary precipitation and co-precipitation on TiN particles takes place during transfer time. Based on these findings, this paper discusses the effect of long times after roughing steps on the driving force for strain induced precipitation at finishing rolling in seamless tube. Thermo-Calc (TM) software was used to evaluate the possible amount of Nb that remains in solid solution just before finishing. Due to previous precipitation, the driving force to be considered in the Dutta-Sellars equations for onset of precipitation decreases and a comparison between recrystallization and precipitation curves shows that recrystallization takes place before the start of strain induce precipitation.

关键词： Hot torsion tests Seamless tube rolling microstructure modeling

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modeling of static and geometric dynamic recrystallization during hot extrusion of Al-Mg-Si alloy

Modeling of static and geometric dynamic recrystallization d...

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14th International Conference on Aluminium Alloys (ICAA)

作者： Sherstnev, Pavel Zamani, Adrian LKR Leichtmet Kompetenzzentrum Ranshofen GmbH A-5282 Ranshofen Austria

ISBN: (纸本)9783038351207

Under certain conditions of extrusion temperature and strain rate Al-Mg-Si alloys produce coarse recrystallized grains at and near the surface. Current FEM models are able to analyze grain size evolution for extruded profiles, but cannot predict the coarse recrystallized grains near the surface. A new model using DEFORM 2D and local state variables such as strain, strain rate and temperature is compared with Al-Mg-Si rods extruded at 440 degrees C and 500 degrees C for two extremes of strain rate. The model is found to be sensitive to the processing conditions and to accurately predict the recrystallized grain size and fraction.

关键词： microstructure modeling extrusion FEM static recrystallization geometric dynamic recrystallization peripheral recrystallization

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