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Two-Scale Thermomechanical Simulation of Hot Stamping

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Book Series: Schriftenreihe Kontinuumsmechanik im Maschinenbau / Karlsruher Institut für Technologie, Institut für Technische Mechanik - Bereich Kontinuumsmechanik ISSN: 2192693X ISBN: 9783731507147 Year: Volume: 11 Pages: X, 245 p. DOI: 10.5445/KSP/1000073431 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:01:58
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Hot stamping is a hot drawing process which takes advantage of the polymorphic steel behavior to produce parts with a good strength-to-weight ratio. For the simulation of the hot stamping process, a nonlinear two-scale thermomechanical model is suggested and implemented into the FE tool ABAQUS. Phase transformation and transformation induced plasticity effects are taken into account. The simulation results regarding the final shape and residual stresses are compared to experimental findings.

Metals Challenged by Neutron and Synchrotron Radiation

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ISBN: 9783038426790 9783038426806 Year: Pages: 288 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Mining and Metallurgy
Added to DOAB on : 2018-02-08 13:10:36
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Neutron and Synchrotron radiation methods have matured to become powerful techniques for the study of a vast range of materials, including metals. The characterization methods comprise the categories of diffraction, spectroscopy and imaging, which themselves can alter greatly in detail, to include hundreds of variants, problems and sample environments. In a similar way, their applications to metals and hard condensed matter materials cover disciplines spanning engineering, physics, chemistry, materials science and their derivatives such as geology, energy storage, etc. … The present book, “Metals Challenged by Neutron and Synchrotron Radiation” is a first compilation in Metals of 20 original and review works on research utilizing or designing those state-of-the-art techniques at modern facilities. The Editorial reviews the context of and identifies thematic links between these papers, grouping them into five interwoven themes, namely Sintering Techniques and Microstructure Evolution, Titanium Aluminides and Titanium Alloys Under Extreme Conditions, Metallic Glass and Disordered Crystals, In Situ and Time-Resolved Response to Mechanical Load and Shock, and Thin Films and Layers. This book represents a good cross-section of the status quo of neutron and synchrotron radiation with respect to questions in the metallurgical field, which by far is not exhaustive. Nor are the methods and other materials, which motivated me to the creation of a new sister-journal, entitled Quantum Beam Science. With this, I would like to thank all authors, reviewers and contributors behind the scene for the creation of this work, presenting to you a piece of interesting reading and reference literature.

Manufacturing and Application of Stainless Steels

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ISBN: 9783039286508 / 9783039286515 Year: Pages: 260 DOI: 10.3390/books978-3-03928-651-5 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering --- Mining and Metallurgy
Added to DOAB on : 2020-06-09 16:38:57
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Stainless steels represent a quite interesting material family, both from a scientific and commercial point of view, following to their excellent combination in terms of strength and ductility together with corrosion resistance. Thanks to such properties, stainless steels have been indispensable for the technological progress during the last century and their annual consumption increased faster than other materials. They find application in all these fields requiring good corrosion resistance together with ability to be worked into complex geometries. Despite to their diffusion as a consolidated materials, many research fields are active regarding the possibility to increase stainless steels mechanical properties and corrosion resistance by grain refinement or by alloying by interstitial elements. At the same time innovations are coming from the manufacturing process of such a family of materials, also including the possibility to manufacture them starting from metals powder for 3D printing. The Special Issue scope embraces interdisciplinary work covering physical metallurgy and processes, reporting about experimental and theoretical progress concerning microstructural evolution during processing, microstructure-properties relations, applications including automotive, energy and structural.

Bainite and Martensite: Developments and Challenges

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ISBN: 9783039288571 / 9783039288588 Year: Pages: 166 DOI: 10.3390/books978-3-03928-858-8 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering --- Materials
Added to DOAB on : 2020-06-09 16:38:57
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The microstructures of both martensite and bainite, although sharing some common features, depict a plethora of subtle differences that made them unique when studied in further detail. Tailoring the final properties of a microstructure based on one or the other as well as in combination with others and exploring more sophisticated concepts, such as Q&P and nanostructured bainite, are the topics which are the focus of research around the world. In understanding the key microstructural parameters controlling the final properties as well as definition of adequate process parameters to attain the desired microstructures requires that a proper understanding of the mechanism ruling their transformation and a detailed characterization first be acheived. The development of new and powerful scientific techniques and equipment (EBSD, APT, HRTEM, etc.) allow us to gain fundamental insights that help to establish some of the principles by which those microstructures are known. The developments accompanying such findings lead to further developments and intensive research providing the required metallurgical support.

Keywords

medium-Mn steel --- austenite decomposition --- dilatometry --- phase equilibrium --- retained austenite --- high carbon steels --- nanobainite --- low temperature bainite --- tensile ductility --- retained austenite stability --- transformation induced plasticity (TRIP) --- microalloyed steels --- niobium --- molybdenum --- titanium --- mechanical properties --- yield strength --- impact toughness --- modeling --- microstructure --- EBSD --- bainite --- ausforming --- kinetics --- plate thickness --- steel --- martensite --- bainite --- Q&amp --- P --- synchrotron --- HEXRD --- TRIP --- low temperature bainite --- nitrocarburising --- surface modification --- retained austenite --- bainitic ferrite --- transmission electron microscopy --- creep resistant steels --- carbonitrides precipitation --- martensite --- tempering --- thermomechanical treatment --- ferritic/martensitic steel --- MX nanoprecipitates --- tempered martensite embrittlement --- lenticular martensite --- offshore steels --- electron backscattering diffraction --- Kernel average misorientation --- transmission Kikuchi diffraction --- ultrahigh strength steel --- austempering --- carbon partitioning --- carbide precipitation --- bainitic/martensitic ferrite --- stainless steel --- metastable austenite --- strain-induced martensite --- transformation kinetics --- inductive measurements --- martensitic steel --- direct quenched --- industrialization --- hot rolling --- tempering --- welding --- fatigue --- high strength steel --- tempering --- dilatation behavior --- phase transformation --- microstructure --- bainite --- martensite --- n/a

Physical Metallurgy of High Manganese Steels

Authors: ---
ISBN: 9783039218561 9783039218578 Year: Pages: 212 DOI: 10.3390/books978-3-03921-857-8 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering --- Mining and Metallurgy
Added to DOAB on : 2020-01-07 09:08:26
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The Special Issue ‘Physical Metallurgy of High Manganese Steels’ addresses the highly fascinating class of manganese-alloyed steels with manganese contents well above 3 mass%. The book gathers manuscripts from internationally recognized researchers with stimulating new ideas and original results. It consists of fifteen original research papers. Seven contributions focus on steels with manganese contents above 12 mass%. These contributions cover fundamental aspects of process-microstrcuture-properties relationships with processes ranging from cold and warm rolling over deep rolling to heat treatment. Novel findings regarding the fatigue and fracture behavior, deformation mechanisms, and computer-aided design are presented. Additionally, the Special Issue also reflects the current trend of reduced Mn content (3-12 mass%) in advanced high strength steels (AHSS). Eight contributions were dedicated to these alloys, which are often referred to as 3rd generation AHSS, medium manganese steels or quenching and partitioning (Q&P/Q+P) steels. The interplay between advanced processing, mainly novel annealing variants, and microstructure evolution has been addressed using computational and experimental approaches. A deeper understanding of strain-rate sensitivity, hydrogen embrittlement, phase transformations, and the consequences for the materials’ properties has been developed. Hence, the topics included are manifold, fundamental-science oriented and, at the same time, relevant to industrial application.

Keywords

medium-manganese steel --- TRIP --- strain-rate sensitivity --- Lüders band --- serrated flow --- in-situ DIC tensile tests --- TWIP steel --- deformation twinning --- serrated flow --- dynamic strain aging --- damage --- fracture --- medium-manganese --- forging --- austenite reversion --- mechanical properties --- microstructure --- D&amp --- P steel --- processing --- microstructure --- phase transformation --- dislocation density --- mechanical properties --- MMn steel X20CrNiMnVN18-5-10 --- V alloying --- corrosion resistance --- precipitations --- ultrafine grains --- high-manganese steels --- high-entropy alloys --- alloy design --- plastic deformation --- annealing --- microstructure --- texture --- mechanical properties --- neutron diffraction --- austenite stability --- medium manganese steel --- double soaking --- localized deformation --- medium-Mn steel --- hot-stamping --- double soaking --- continuous annealing --- quenching and partitioning --- high strength steel --- high manganese steel --- crash box --- lightweight --- multiscale simulation --- high-Mn steels --- twinning induced plasticity --- cold rolling --- recrystallization annealing --- grain refinement --- strengthening --- austenitic high nitrogen steel (HNS) --- cold deformation --- fatigue --- high manganese steel --- warm rolling --- processing --- microstructure --- texture --- mechanical properties --- deformation behavior --- high-manganese steel --- deep rolling --- TWIP --- TRIP --- near surface properties --- residual stresses --- fatigue behavior --- intercritical annealing --- medium manganese steel --- phase field simulation --- medium-Mn steel --- austenite-reversed-transformation --- retained austenite --- hydrogen embrittlement --- ultrafine-grained microstructure --- strain-hardening behavior --- n/a

Laser Welding

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ISBN: 9783039288618 / 9783039288625 Year: Pages: 260 DOI: 10.3390/books978-3-03928-862-5 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2020-06-09 16:38:57
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Laser welding is a high-energy process used in a wide range of advanced materials to obtain micro- to macro-sized joints in both similar and dissimilar combinations. Moreover, this technique is widely used in several industries, such as automotive, aerospace, and medical industries, as well as in electrical devices. Although laser welding has been used for several decades, significant and exciting innovations often arise from both the process and/or advanced materials side.

Keywords

laser beam welding --- buy-to-fly --- L-joint --- T-joint --- Ti–6Al–4V --- dissimilar joining --- laser welding-brazing --- finite element method --- titanium --- aluminium --- laser welds --- mechanical properties --- low alloyed steel --- dual phase steel --- trip steel --- laser beam welding --- conduction regime --- Ti-5Al-5V-5Mo-3Cr --- laser offset welding --- hybrid welding --- microstructure --- intermetallic layer --- pulsed Nd:YAG laser beam welding --- DP1000 steel --- penetration --- hardness --- phase transformation --- dissimilar welding --- fiber laser --- finite element analysis --- laser welding --- spatter --- liquid metal --- high-speed imaging --- porosity control --- laser stake welding --- aluminum alloy T-joint --- aided electric current --- weld morphology --- mechanical properties --- Al/steel joints --- laser keyhole welding --- IMC layers --- tensile properties --- EBSD phase mapping --- high temperature titanium alloy --- laser welding --- microstructure --- mechanical properties --- BTi-6431S --- fiber laser welding --- dissimilar material --- stainless steel --- microstructure --- hardness --- tensile strength --- steel S700MC --- hybrid welding --- HLAW --- laser beam --- MAG --- magnesium alloy thin sheet --- fiber laser welding --- microstructure --- mechanical properties --- H-shaped fusion zone --- laser welding --- keyhole --- weld pool behavior --- mass transfer --- dissimilar metal --- LKW --- WW --- prediction --- accuracy --- SKM --- WPP --- n/a

Design and Development of Nanostructured Thin Films

Authors: --- ---
ISBN: 9783039287383 / 9783039287390 Year: Pages: 386 DOI: 10.3390/books978-3-03928-739-0 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General)
Added to DOAB on : 2020-06-09 16:38:57
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Due to their unique size-dependent physicochemical properties, nanostructured thin films are used in a wide range of applications from smart coating and drug delivery to electrocatalysis and highly-sensitive sensors. Depending on the targeted application and the deposition technique, these materials have been designed and developed by tuning their atomic-molecular 2D- and/or 3D-aggregation, thickness, crystallinity, and porosity, having effects on their optical, mechanical, catalytic, and conductive properties. Several open questions remain about the impact of nanomaterial production and use on environment and health. Many efforts are currently being made not only to prevent nanotechnologies and nanomaterials from contributing to environmental pollution but also to design nanomaterials to support, control, and protect the environment. This Special Issue aims to cover the recent advances in designing nanostructured films focusing on environmental issues related to their fabrication processes (e.g., low power and low cost technologies, the use of environmentally friendly solvents), their precursors (e.g., waste-recycled, bio-based, biodegradable, and natural materials), their applications (e.g., controlled release of chemicals, mimicking of natural processes, and clean energy conversion and storage), and their use in monitoring environment pollution (e.g., sensors optically- or electrically-sensitive to pollutants)

Keywords

InAlN --- nanospiral --- metamaterial --- sputtering --- chirality --- microparticle deposition --- self-assembly --- homogeneity --- monomer synthesis --- mask --- hazardous organic solvents --- photonic nanostructures --- self-assembly --- polymer nanoparticles --- biomimetic solvent sensors --- iridescence --- mesoporous --- Al2O3 --- MgO --- poly(dimethylacrylamide) --- hydrogel --- thin film --- spin coating --- SEM --- FIB --- Kr physisorption --- hydrogenated amorphous carbon films --- metallic nanoparticles --- hybrid deposition system --- nanoscratch --- nanocomposites --- aqueous dispersion --- carbon nanotube --- graphene oxide --- ink --- rod coating --- electrical conductivity --- optical transmittance --- mechanical flexibility --- silk sericin --- agarose --- lysozyme --- composite gel --- wound dressing --- nanofiber --- lamination --- water filtration --- CdTe --- self-catalysed --- wires --- Mg alloy --- LDH --- corrosion --- deposition --- coating --- ReB2/TaN multilayers --- modulation structure --- first-principles calculation --- interfacial model --- adsorption energy --- interfacial energy --- biomaterial --- biomedical --- nanofibers --- scaffolds --- reinforced --- hybrid material --- thermal analysis --- nanofibrous membranes --- light trapping --- silicon thin film --- photovoltaics --- polystyrene sphere assisted lithography --- nanostructured back reflectors --- Raman scattering --- quantum confinement --- electron–phonon coupling --- polar semiconductors --- zinc oxide --- metal-organic framework --- microscopy --- thin films --- powders --- electrodeposition --- platinum --- highly oriented pyrolytic graphite --- 2D growth --- barrier material --- nanocoating of SiOx --- polymeric matrix --- plasma deposition --- PVD --- PA-PVD --- PECVD --- permeation --- CERAMIS® --- SorpTest --- iron oxides --- FeO --- Fe3O4 --- ultrathin films --- epitaxial growth --- platinum --- ruthenium --- symmetry --- LEEM --- LEED --- XPEEM --- electrodeposition --- platinum --- highly oriented pyrolytic graphite --- 2D growth --- thin films --- TiO2NPs --- AuNPs --- photocatalysis --- mercury vapors adsorbing layer --- PAS device --- iron oxides --- ultrathin films --- silver --- epitaxial growth --- structural characterization --- STM --- LEED --- XPS --- DFT --- model system --- Pt thin deposits --- galvanic displacement --- UPD --- SLRR --- electrocatalysis --- nanostructured films --- birefringence --- nanocrystalline cellulose --- Mueller matrix --- vanadium dioxide --- post-treatment --- plasma irradiation --- luminous transmittance --- phase transition performance --- electrospinning deposition --- chemosensor --- nanocomposite conductive polymers --- polyhydroxibutyrate --- polystyrene --- H2TPP --- VOCs selectivity --- mesoporous graphene --- thin film --- nanostructure --- CaxCoO2 --- sputtering --- phase transformation --- Ge surface engineering --- La2O3 passivation layer --- atomic layer deposition --- electrical properties

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