Listing 1 - 10 of 30 | << page >> |
Sort by
|
Choose an application
Phase-field modeling has spread to a variety of applications involving phase transformations.While the method has wide applicability, derivation of quantitative predictions requires deeper understanding of the coupling between the system and model parameters. The book highlights a novel phase-field model based on a grand-potential formalism allowing for an elegant and efficient solution to problems in phase transformations.
eutectic --- grand-potential --- solidification --- monotectic --- multi-component --- peritectic --- phase-field
Choose an application
Almost all processing of technologically important materials includes a process where liquid material is cooled to form a solid, called ""solidification."" In order to form a solid from an undercooled melt, the formation of crystalline nuclei and growth of these nuclei to form a solid are necessary. The process of an atom jumping from the liquid to the solid is a diffusive jump with a driving force. The book Solidification is logically developed through a careful presentation of the relevant theories and models of solidification occurring in a variety of materials. Mathematicians, chemists, physicists, and engineers concerned with melting/freezing phenomena will also find this book to be valuable.
Solidification. --- Crystallization --- Heat --- Melting points --- Solutions, Solid --- Physical Sciences --- Engineering and Technology --- Materials Science
Choose an application
In this work, the solidification process of the high-temperature materials NiAl-34Cr und Nb-Si is investigated with the phase-field method. This work includes an entire investigation chain from the modeling of the material systems to the conduction of representative phase-field simulations, and finally to the analyzation of the resulting microstructures.
Mechanical engineering & materials --- Phasenfeldsimulationen --- Modellierung --- gerichtete Erstarrung --- Mikrostrukturanalyse --- Phase-field Simulation --- Modeling --- Directional Solidification --- Microstructure analysis
Choose an application
A single-crystal plasticity model as well as a gradient crystal plasticity model are used to describe the creep behavior of directionally solidi?ed NiAl based eutectic alloys. To consider the transition from theoretical to bulk strength, a hardening model was introduced to describe the strength of the reinforcing phases. Moreover, to account for microstructural changes due to material ?ux, a coupled diffusional-mechanical simulation model was introduced.
Crystal plasticity --- Creep --- Directional solidification --- Gradient plasticity --- Finite element simulation --- Kriechen --- Gerichtete Erstarrung --- Finite Elemente Methode --- Kristallplastizität --- Gradientenplastizität
Choose an application
Steel has become the most requested material all over the world during the rapid technological evolution of recent centuries. As our civilization grows and its technological development becomes connected with more demanding processes, it is more and more challenging to fit the required physical and mechanical properties for steel in its huge portfolio of grades for each steel producer. It is necessary to improve the refining and casting processes continuously to meet customer requirements and to lower the production costs to remain competitive. New challenges related to both the precise design of steel properties and reduction in production costs are combined with paying special attention to environmental protection. These contradictory demands are the theme of this book.
oxygen converter slag --- chemical composition of slag --- structural composition of slag --- continuous casting --- tundish --- residence time --- transient casting --- swirling flow tundish --- SEN immersion depth --- multiphase flow --- heat transfer --- continuous casting mold --- computional fluid dynamiscs (CFD) --- fuzzy logic --- optimal cooling --- steel quality prediction --- deoxidation --- inclusions --- thermodynamics --- Ti-bearing steel --- Ca treatment --- dephosphorization --- EAF --- BOF --- phosphorus equilibrium --- wide-thick slab --- non-uniform solidification --- heavy reduction --- porosity --- deformation --- ladle stirring --- turbulence --- slag --- interface --- refining --- mixing time --- slag opening --- pipeline steel --- cooling rate --- composition --- Al-TRIP steel --- slag-steel reaction --- crystalline morphology --- equilibrium model --- CALPHAD --- thermodynamic model --- rare earth --- numerical simulation --- C80D steel --- transverse water flux distribution --- solidification structure --- reoxidation --- tundish cover flux --- Cr2O3 --- decomposition reaction --- RH degasser --- physical Simulation --- mixing Time --- PIV --- flow field --- n/a
Choose an application
Investigation of the effect of casting and crystallization on the structure and properties of the resulting light alloys and, in particular, research connected with detailed analysis of the microstructure of light alloys obtained using various external influences of ultrasonic, vibration, magnetic, and mechanical processing on the casting and crystallization are discussed. Research on the study of introduction of additives (modifiers, reinforcers, including nanosized ones, etc.) into the melt during the crystallization process, the technological properties of casting (fluidity, segregation, shrinkage, etc.), the structure and physicomechanical properties of light alloys are also included.
aluminum alloy --- titanium diboride --- master alloy --- structure --- mechanical properties --- aluminum --- alumina nanoparticles --- microstructure --- elastic limit --- strength --- Al/SiC composite --- porosity in composites --- finite element analysis --- Al–Mg–Si --- α-Al8(Fe2Mn)Si particles --- solution treatment --- ageing --- dissolution of Fe --- Differential Scanning Calorimetry --- casting speed --- solidification --- Ohno continuous casting --- gravity casting --- dendritic spacing --- composite materials --- hypereutectic aluminum alloys --- Al-Zn-Mg alloys --- rapid solidification --- eutectic --- CALPHAD --- intermetallics --- precipitation hardening --- aluminum-zirconium wire alloys --- electromagnetic casting --- drawing --- electrical conductivity --- phase composition --- nanoparticles --- friction stir processing --- aluminum alloys --- copper alloys --- titanium alloys --- magnesium alloys --- subsurface gradient structures --- surface modification --- hardening with reinforcing particles --- hybrid in situ surfaces --- friction stir welding --- grade 2 titanium alloy --- ZhS6U Ni-based superalloy --- welding tool --- tool wear --- structure formation --- adhesion --- metal transfer --- in-situ friction stir process --- Al-Cu metallomatrix composite --- intermetallic compounds --- diffusion-controlled reactions --- Al-Cu eutectics --- intermetallides --- hydrides --- TiAl system --- n/a --- Al-Mg-Si
Choose an application
In recent years, the industry has started to use parts printed by powder-based laser additive manufacturing (LAM) when precision and good mechanical properties are required. Applications can be found in the aerospace, automotive, and medical sectors. However, the powder materials available are often inadequate for contemporary processing tasks, and often generate process instabilities as well as porosities and defects in the resulting parts. This Special Issue, “New Frontiers in Materials Design for Laser Additive Manufacturing”, focuses on advances in material design and the development of laser additive manufacturing. Of particular interest are original papers dealing with metal and polymer powders for laser powder bed fusion or directed energy deposition. In this Special Issue, we are especially interested in answering the following questions: How can laser process parameters and material properties be adapted to the LAM process via the matrix modification (e.g., alloying, doping, compounding) of powders? How can powder properties like flowability, wetting, porosity, or (heterogeneous) nucleation be adapted to the LAM process via the surface modification of powders? How may calorimetry, high-speed videography, pyrometry, and online spectroscopy, as well as modeling, contribute to understanding dynamics of melting and recrystallization, in addition to the lateral distribution of the thermal process window?
Technology: general issues --- Chemical engineering --- powder bed fusion --- magnesium --- process development --- additive manufacturing --- PBF-LB/M --- tool steel (1.2709) --- nanocomposite --- microstructure --- mechanical properties --- laser powder bed fusion --- selective laser melting --- oxide dispersion strengthened steel --- phase-field model --- finite element simulation --- nanoparticle interaction --- pure copper --- short wavelength laser system --- green laser --- eddy-current method --- electrical conductivity --- polyamide 12 --- nanocomposites --- nanoparticles --- dispersion --- LB-PBF --- additively manufactured parts --- aluminum alloys --- intermetallics --- thermal exposure --- n/a --- aluminium alloys --- hot cracking --- rapid solidification --- differential fast scanning calorimetry --- undercooling --- grain size --- crack density
Choose an application
The present book contains nine articles that were accepted and published in the Special Issue “Modeling and Control of Energy Conversion during Underground Coal Gasification Process” of the MDPI Energies journal. This book focuses on the energy conversion processes in underground coal gasification (UCG), as well as on the modeling and control of this process. The articles published in this book can be divided into three thematic parts of research in the field of underground coal gasification technology: the first part is the impact of technology on the environment, the second is research (studies) on the coal areas and coal properties of UCG technology, and the third is the monitoring, modeling, and control processes within UCG. We hope that this book will be interesting and useful for workers and researchers in the field of underground coal gasification technology, as well as for those who are interested in the mathematical modeling and control of this process.
Technology: general issues --- History of engineering & technology --- low-carbon energy --- UCG technology --- grouting --- solidification soil --- soil air --- statistic model --- soil contamination --- atmospheric geochemical survey --- environmental burden --- underground coal gasification (UCG) --- optimization --- syngas --- calorific value --- optimal control --- operating variables --- control algorithm --- coal gasification --- rocks --- coal seam --- material balance --- heat balance --- tightness --- gas --- underground coal gasification --- georeactor --- char --- melted waste rock --- gas permeability --- tortuosity --- porosity --- measurement --- temperature --- regression --- model --- analyses --- cavity --- lignite --- UCG --- ex situ tests --- high temperature --- strength and structural parameters of rocks after heating --- destruction zone around gasified channel --- SNG --- UCG wastewater --- environmental impact assessment --- correlation analysis --- effluents --- n/a
Choose an application
Ultrasonic waves are nowadays used for multiple purposes including both low-intensity/high frequency and high-intensity/low-frequency ultrasound. Low-intensity ultrasound transmits energy through the medium in order to obtain information about the medium or to convey information through the medium. It is successfully used in non-destructive inspection, ultrasonic dynamic analysis, ultrasonic rheology, ultrasonic spectroscopy of materials, process monitoring, applications in civil engineering, aerospace and geological materials and structures, and in the characterization of biological media. Nowadays, it is an essential tool for assessing metals, plastics, aerospace composites, wood, concrete, and cement. High-intensity ultrasound deliberately affects the propagation medium through the high local temperatures and pressures generated. It is used in industrial processes such as welding, cleaning, emulsification, atomization, etc.; chemical reactions and reactor induced by ultrasonic waves; synthesis of organic and inorganic materials; microstructural effects; heat generation; accelerated material characterization by ultrasonic fatigue testing; food processing; and environmental protection. This book collects eleven papers, one review, and ten research papers with the aim to present recent advances in ultrasonic wave propagation applied for the characterization or the processing of materials. Both fundamental science and applications of ultrasound in the field of material characterization and material processing have been gathered.
ultrasonic lens --- axicon lens --- focused ultrasound --- transcranial ultrasound --- non-destructive inspection --- damage identification --- topology optimization --- ultrasonic wave propagation --- ultrasonic visualization --- L-shaped ultrasonic wave guide rod --- ultrasonic bending vibration --- 2A14 aluminum alloy --- solidification structure --- composition segregation --- 1060 aluminum alloy --- twin-roll casting --- microstructure --- mechanical properties --- concrete --- mesostructure --- Lamb wave --- heterogeneity --- Monte Carlo method --- SHM --- ultrasound --- time of flight --- reinforcement --- resin transfer molding (RTM) --- permeability --- liquid composite molding --- material characterization --- composite manufacturing --- liquid penetration --- ultrasound transmission --- capillary penetration --- porous sheets --- bulk metallic glass --- ultrasonic assisted turning --- finite element analysis --- cutting force --- guided waves --- setting time --- mortar and concrete --- early age --- thermoplastic composites --- ultrasonic joints --- resistance heating --- elastography --- viscoelastic properties --- creep --- stress relaxation --- n/a
Choose an application
There is increasingly intensive research for energy storage technologies development due to the enhanced energy needs of the contemporary societies. Increased global energy consumption results in the reduction in the availability of traditional energy resources, such as coal, oil and natural gas. Therefore, there is an urgent need for new systems development based on the conversion and storage of sustainable and clean energy. Phase change materials (PCMs) are one of the key components for the development of advanced sustainable solutions in renewable energy and engineering systems. In order to update the field of renewable energy and engineering systems with the use of PCMs, a Special Issue entitled “Phase Change Materials: Design and Applications” is introduced. This book gathers and reviews the collection of ten contributions (nine articles and one review), with authors from Europe, Asia and Americam accepted for publication in the aforementioned Special Issue of Applied Sciences.
phase change materials --- thermal energy storage --- energy efficiency --- building applications --- construction materials --- phase-change material --- dispersion --- thermal-mechanical stability --- viscosity --- supercooling --- nucleating agent --- cold storage --- battery cooling --- LPMO --- Fourier Transform ac Voltammetry (FTacV) --- cyclic voltammetry --- Direct Electron Transfer (DET) --- lathrate hydrate --- tetrabutylammonium acrylate (TBAAc) --- crystal growth --- ultrasonic vibration --- polyurethane elastomers --- microencapsulated PCMs --- thermal properties --- mechanical properties --- phase change material --- sugar alcohol --- erythritol --- latent heat storage --- thermal stability --- degradation kinetics --- PCM --- mini-channels --- air --- melting --- solidification --- latent heat thermal energy storage --- phase change materials (PCM) --- macro-encapsulation --- rectangular slab --- experimental study --- sodium nitrate --- thermal conductivity --- microencapsulation --- latent heat --- multicriteria decision --- finite element --- automotive --- energy storage --- n/a
Listing 1 - 10 of 30 | << page >> |
Sort by
|