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topological transformations
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Published: 01 December 2009
Fig. 14 Two-dimensional topological transformations. (a) Neighbor switching, T1. (b) Triangle elimination, T2
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Image
Published: 01 December 2009
Fig. 16 To demonstrate topological transformations, a small system is used. Six grains fill the shown cube; in the figure, only two of them are shown, but the remaining grains completely fill the space. GB, grain boundary. Image in color
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Image
Published: 01 December 2009
Fig. 17 Fundamental topological transformations. (a)–(c) Triple-line collapse: (a) original configuration, (b) collapse of the triple line e 1 , and (c) restoration of the topology by the introduction of a new triangular grain boundary. (d) and (e) Grain-boundary collapse: (d) configuration
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Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005422
EISBN: 978-1-62708-196-2
... of the microstructure, formulation of the equation of motion, and implementation of the topological transformations. The article presents examples that illustrate the simulation of physical phenomena to demonstrate the predictive power and flexibility of network models. vertex models grain growth grain-boundary...
Abstract
This article reviews network models and their applications for the simulation of various physical phenomena related to grain-boundary migration. It discusses the steps involved in the implementation of two and three-dimensional network models, namely, acquisition and discretization of the microstructure, formulation of the equation of motion, and implementation of the topological transformations. The article presents examples that illustrate the simulation of physical phenomena to demonstrate the predictive power and flexibility of network models.
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006314
EISBN: 978-1-62708-179-5
... Abstract The microstructure that develops during the solidification stage of cast iron largely influences the subsequent solid-state transformations and mechanical properties of the cast components. This article provides a brief introduction of methods that can be used for simulating...
Abstract
The microstructure that develops during the solidification stage of cast iron largely influences the subsequent solid-state transformations and mechanical properties of the cast components. This article provides a brief introduction of methods that can be used for simulating the solidification microstructure of cast iron. Analytical as well as numerical models describing solidification phenomena at both macroscopic and microscopic scales are presented. The article introduces macroscopic transport equations and presents analytical microscopic models for solidification. These models include the dendrite growth models and the cooperative eutectic growth models. The article provides some solutions using numerical models to simulate the kinetics of microstructure formation in cast iron. It concludes with a discussion on cellular automaton (CA) technique that can handle complex topology changes and reproduce most of the solidification microstructure features observed experimentally.
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005836
EISBN: 978-1-62708-167-2
...-phase controlled bridge rectifier Direct Current/Direct Current (dc/dc) The transformation of a given voltage into a dc voltage of different magnitude and/or polarity is done with dc/dc converters or dc choppers. Over the years, a number of different topologies have been established...
Abstract
This article reviews the performance of power electronics components, namely, power rectifiers, insulated-gate bipolar transistors, metal-oxide semiconductor field-effect transistors, diodes, and silicon-controlled rectifiers. It provides information on induction heating power supplies with multiple heat stations, such as switching units and multiple (zone) outputs. The article describes power supply operational control and power supply protection circuits. It details duty cycle, power factor, and harmonics of power supplies. The article also describes system parameters, software analysis-calculations, human analysis-decisions, multiple system arrangements, and zone control systems for power supply selection. It provides information on the maintenance of induction power supplies, detailing the safety precautions to be taken and the need for routine inspection and servicing.
Series: ASM Handbook
Volume: 24A
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.hb.v24A.a0006958
EISBN: 978-1-62708-439-0
.... additive manufacturing gas industry oil industry part selection process control Additive Manufacturing Background The Fourth Industrial Revolution (4IR) is characterized by the digitalization of manufacturing, which can transform operations, processes, and the structure of global supply chains...
Abstract
This article focuses on the technologies and applications of additive manufacturing (AM) in the oil and gas industry. It then presents the challenges of AM and the oil and gas industry. The article provides a detailed description of the critical steps in the AM process chain, including part selection, design optimization, and process planning, control, and inspection. Qualification and certification standardization is discussed, as is a commitment to reduce the carbon footprint of the manufacturing sector through AM. It ends with the future outlook of AM in the oil and gas industry.
Series: ASM Handbook
Volume: 24A
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.hb.v24A.a0006950
EISBN: 978-1-62708-439-0
... requires understanding and controlling the underlying mechanisms, such as rapid heating and cooling, process-induced distortion, nonequilibrium solidification, solid-state phase transformations, and melt pool dynamics. Moreover, due to the relative unpredictability of AM material properties, many...
Abstract
Additive manufacturing (AM) provides exceptional design flexibility, enabling the manufacture of parts with shapes and functions not viable with traditional manufacturing processes. The two paradigms aiming to leverage computational methods to design AM parts imbuing the design-for-additive-manufacturing (DFAM) principles are design optimization (DO) and simulation-driven design (SDD). In line with the adoption of AM processes by industry and extensive research efforts in the research community, this article focuses on powder-bed fusion for metal AM and material extrusion for polymer AM. It includes detailed sections on SDD and DO as well as three case studies on the adoption of SDD, DO, and artificial-intelligence-based DFAM in real-life engineering applications, highlighting the benefits of these methods for the wider adoption of AM in the manufacturing industry.
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005511
EISBN: 978-1-62708-197-9
... of phase stabilities, phase transformation temperatures, phase amounts, and phase compositions in an equilibrium state is critically needed in the determination of processing parameters. In this section, four examples are presented to show how multicomponent phase diagram calculation can be readily useful...
Abstract
This article focuses on the industrial applications of phase diagrams. It presents examples to illustrate how a multicomponent phase diagram calculation can be readily useful for industrial applications. The article demonstrates how the integration of a phase diagram calculation with kinetic and microstructural evolution models greatly enhances the power of the CALPHAD approach in materials design and processing development. It also discusses the limitations of the CALPHAD approach.
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005459
EISBN: 978-1-62708-196-2
... methodologies. These include JMAK (Avrami) models, topological models, and mesoscale physics-based models. microstructure evolution thermomechanical processing nickel-base superalloys avrami model topological model mesoscale physics-based model THE MODELING OF MICROSTRUCTURE EVOLUTION during...
Abstract
This article summarizes the general features of microstructure evolution during the thermomechanical processing (TMP) of nickel-base superalloys and the challenges posed by the modeling of such phenomena. It describes the fundamentals and implementations of various modeling methodologies. These include JMAK (Avrami) models, topological models, and mesoscale physics-based models.
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003802
EISBN: 978-1-62708-177-1
... transformation (dia- INCRA International Copper Research Asso- ite is completed during heating A1 eutectoid isothermal of austenite in steel gram) ciation (same as Ae1) CDA Copper Development Association ISO International Organization for Standardi- Ac1 the temperature at which austenite begins cm centimeter...
Series: ASM Handbook
Volume: 24A
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.hb.v24A.a0006949
EISBN: 978-1-62708-439-0
... shapes and topologies. These types of extended PC opportunities are defined as extended AM-PC potentials. On the other hand, AM provides new opportunities for consolidating components with relative motion or material variances, which is drastically different from PC in the CM context. Typical...
Abstract
This article focuses on two streams of the research on part consolidation (PC): PC in the conventional manufacturing context, and PC in the additive manufacturing (AM) context. It reviews the challenges of applying AM-PC potentials. The article includes research literature on the selection of part candidates for consolidation and summarizes the conversion of assembly design to consolidated design. Then, a holistic approach for supporting PC design is introduced with integrated modules of part filtering and fusion of parts. Details of the key techniques of the two modules are later introduced with a gas pedal example. Finally, emerging trends in PC research are discussed.
Book Chapter
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005647
EISBN: 978-1-62708-174-0
... Å angstrom ac alternating current Ac 1 temperature at which austenite begins to form during heating Ac 3 temperature at which transformation of ferrite to austenite is completed during heating Ae cm , Ae 1 , Ae 3 equilibrium transformation temperatures in steel AISI...
Book Chapter
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003721
EISBN: 978-1-62708-177-1
... microscopy is capable of resolving various crystal defects such as dislocations, dislocation dipoles, dislocation networks, and dislocation loops. The characteristic structures of metals and alloys are produced by (1) transformations in which one or more parent phases are converted into one or more new...
Abstract
This article provides information on the general structural features and origins of metals. The characteristic structural features of single-phase metals and alloys, such as grain structure and substructure, are discussed. The article also describes the major types of multiphase structures and macrostructure of metals and alloys.
Series: ASM Handbook
Volume: 24A
Publisher: ASM International
Published: 30 June 2023
DOI: 10.31399/asm.hb.v24A.a0006975
EISBN: 978-1-62708-439-0
... layer-by-layer nature ( Ref 20 ). Design for AM (DFAM) addresses these new challenges from the conceptual to the embodiment and detailed design phases. Related tasks include topology optimization and additive manufacturability analysis. Data analytics and machine learning on AM data provide DFAM...
Abstract
This article presents the analytics challenges in additive manufacturing. It discusses the types and applications of data analytics. Data analytics can be classified into four types: descriptive, diagnostic, predictive, and prescriptive. The diverse applications of data analytics and machine learning include design, process-structure-properties (PSP) relationships, and process monitoring and quality control. The article also presents tools used for data analytics.
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002446
EISBN: 978-1-62708-194-8
... background on how these algorithms make decisions when searching for the optimal design. It also provides information on structural optimization, topology optimization, materials processing optimization, multidisciplinary optimization, and global optimization. design optimization global optimization...
Abstract
This article discusses tools that are used for the systematic optimization of engineering designs. It focuses on the practical application of optimization technology in a computer-aided engineering environment. The article presents numerical optimization algorithms and provides some background on how these algorithms make decisions when searching for the optimal design. It also provides information on structural optimization, topology optimization, materials processing optimization, multidisciplinary optimization, and global optimization.
Book Chapter
Series: ASM Handbook
Volume: 1
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v01.a0005547
EISBN: 978-1-62708-161-0
...' compact tension~ continuous Ar1 temperature at which transformation ilr final cross-sectional area to ferrite or to ferrite plus cementite transformation CTOD crack tip opening displacement a(l original cross-sectional area is completed on cooling CVD chemical vapor deposition CVN Charpy V~notch (impact...
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001762
EISBN: 978-1-62708-178-8
...-dimensional data set consisting of intensity versus the scattering angle to obtain the maximum amount of information available in a diffraction experiment. The accuracy and extent of the diffraction data determine the accuracy of the distance information obtainable. The appropriate Fourier transform...
Abstract
The diffraction pattern of any material contains structural and chemical property information that can be extracted using radial distribution function analysis. This article provides an introduction to the technique and presents several examples highlighting various ways in which it can be used. It begins with a discussion on the principles of diffraction and scattering and the effectiveness of x-ray, neutron, and electron energy sources for different types of measurements. It provides information on data collection and reduction and explains how to create atomic distribution plots from intensity and scattering angle data. The article also presents application parameters for defining short distances and background intensity and describes a procedure for generating pair distribution functions.
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.9781627081801
EISBN: 978-1-62708-180-1
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0006548
EISBN: 978-1-62708-180-1
... temperature at which austenite begins to form on heating Ac3 temperature at which transformation of ferrite to austenite is completed on heating ABS acrylonitrile-butadiene-styrene ACI Alloy Casting Institute AES Auger electron spectroscopy AGMA American Gear Manufacturers Asso- ciation AISI American Iron...
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