Influence Of High Temperature Mechanisms On Microstructural Evolution Of Dual Phase Steels
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Influence Of High Temperature Mechanisms On Microstructural Evolution Of Dual Phase Steels
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Author : Bharath Bandi
language : en
Publisher:
Release Date : 2022
Influence Of High Temperature Mechanisms On Microstructural Evolution Of Dual Phase Steels written by Bharath Bandi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Characterization And Modeling Of Microstructural Evolutions During The Thermal Treatment Of Cold Rolled Dual Phase Steels
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Author : Mélanie Ollat
language : en
Publisher:
Release Date : 2017
Characterization And Modeling Of Microstructural Evolutions During The Thermal Treatment Of Cold Rolled Dual Phase Steels written by Mélanie Ollat and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Dual-Phase steels (DP) are one of the most used Advanced High Strength Steels (AHSS) for automotive applications because they present good strength/ductility compromise and they adapt to number of industrial constraints (low price, shaping, welding, coating etc.). Nowadays, the development of DP steels seems to be promising and sustainable for the body-in-white structure. The typical ferrite-martensite microstructure, characteristic of DP steels, are obtained by a thermal treatment composed of different stages during which metallurgical evolutions occur. Major difficulties of their processing are due to the fact that (i) microstructural evolution kinetics are influenced by cycle parameters (heating rate, annealing temperature etc.), (ii) different stages are interconnected and (iii) some microstructural evolutions may overlap and, therefore, interact. This PhD-work aimed at getting a better understanding of microstructural evolutions during the thermal cycle of DP steel and, namely, the influence of cycle parameters. Different microstructural evolutions occurring during the thermal cycle were first characterized coupling different experimental techniques (dilatometry, hardness, TPE etc.) and with a particular protocol in order to decorrelate overlapping and interconnected phenomena. As example, two major evolutions occurring during the intercritical annealing were first studied individually ((1) recrystallization was investigated below austenite formation temperature and (2) austenite formation was investigated on prior recrystallized steels) before investigated cold-rolled steel case where recrystallization and austenite formation overlap. The study was then attached to develop some predictive tools to describe microstructural evolutions based on phenomenological approaches (JMAK law) towards more physical based models (mixed-mode, diffusive models). A particular care was attached to discuss on model reliability, versatility, strengths and limitations.
Characterization And Modeling Of Microstructural Evolutions During The Thermal Treatment Of Cold Rolled Dual Phase Steels
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Author : Mélanie Ollat
language : en
Publisher:
Release Date : 2019
Characterization And Modeling Of Microstructural Evolutions During The Thermal Treatment Of Cold Rolled Dual Phase Steels written by Mélanie Ollat and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Dual-Phase steels (DP) are one of the most used Advanced High Strength Steels (AHSS) for automotive applications because they present good strength/ductility compromise and they adapt to number of industrial constraints (low price, shaping, welding, coating etc.). Nowadays, the development of DP steels seems to be promising and sustainable for the body-in-white structure. The typical ferrite-martensite microstructure, characteristic of DP steels, are obtained by a thermal treatment composed of different stages during which metallurgical evolutions occur. Major difficulties of their processing are due to the fact that (i) microstructural evolution kinetics are influenced by cycle parameters (heating rate, annealing temperature etc.), (ii) different stages are interconnected and (iii) some microstructural evolutions may overlap and, therefore, interact. This PhD-work aimed at getting a better understanding of microstructural evolutions during the thermal cycle of DP steel and, namely, the influence of cycle parameters. Different microstructural evolutions occurring during the thermal cycle were first characterized coupling different experimental techniques (dilatometry, hardness, TPE etc.) and with a particular protocol in order to decorrelate overlapping and interconnected phenomena. As example, two major evolutions occurring during the intercritical annealing were first studied individually ((1) recrystallization was investigated below austenite formation temperature and (2) austenite formation was investigated on prior recrystallized steels) before investigated cold-rolled steel case where recrystallization and austenite formation overlap. The study was then attached to develop some predictive tools to describe microstructural evolutions based on phenomenological approaches (JMAK law) towards more physical based models (mixed-mode, diffusive models). A particular care was attached to discuss on model reliability, versatility, strengths and limitations.
Microstructure Of Steels And Cast Irons
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Author : Madeleine Durand-Charre
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-03-09
Microstructure Of Steels And Cast Irons written by Madeleine Durand-Charre and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-09 with Technology & Engineering categories.
The book comprises three parts. Part 1 gives a historical description of the development of ironworking techniques since the earliest times. Part 2 is the core of the book and deals with the metallurgical basis of microstructures, with four main themes: phase diagrams, solidification processes, diffusion, and solid state phase transformations. Part 3 begins by an introduction to steel design principles. It then goes on to consider the different categories of steels, placing emphasis on their specific microstructural features. Finally, a comprehensive reference list includes several hundred pertinent articles and books. The book is the work of a single author, thus ensuring uniformity and concision. It is intended for scientists, metallurgical engineers and senior technicians in research and development laboratories, design offices and quality departments, as well as for teachers and students in universities, technical colleges and other higher education establishments.
Multi Scale Invertigation Of The Relationship Between The Microstructure And Mechanical Properties In Dual Phase Steels
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Author : Fan Zhang
language : en
Publisher:
Release Date : 2016
Multi Scale Invertigation Of The Relationship Between The Microstructure And Mechanical Properties In Dual Phase Steels written by Fan Zhang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Dual phase steel alloys belong to the first generation of advanced high strength steels that are widely used in the automotive industry to form body structure and closure panels of vehicles. A deeper understanding of the microstructural features, such as phase orientation and morphology are needed in order to establish their effect on the mechanical performance and to design a material with optimized attributes.
Optimization And Security Challenges In Smart Power Grids
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Author : Vijay Pappu
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-01
Optimization And Security Challenges In Smart Power Grids written by Vijay Pappu and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-01 with Technology & Engineering categories.
This book provides an overview of state-of-the-art research on “Systems and Optimization Aspects of Smart Grid Challenges.” The authors have compiled and integrated different aspects of applied systems optimization research to smart grids, and also describe some of its critical challenges and requirements. The promise of a smarter electricity grid could significantly change how consumers use and pay for their electrical power, and could fundamentally reshape the current Industry. Gaining increasing interest and acceptance, Smart Grid technologies combine power generation and delivery systems with advanced communication systems to help save energy, reduce energy costs and improve reliability. Taken together, these technologies support new approaches for load balancing and power distribution, allowing optimal runtime power routing and cost management. Such unprecedented capabilities, however, also present a set of new problems and challenges at the technical and regulatory levels that must be addressed by Industry and the Research Community.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1995
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.
Processing Microstructure And Mechanical Behavior Of Medium Manganese Steels
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Author : Binhan Sun
language : en
Publisher:
Release Date : 2018
Processing Microstructure And Mechanical Behavior Of Medium Manganese Steels written by Binhan Sun and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
"Developing high strength steels has received increasing attention in steel industry, in order to meet the body-in-white weight reduction strategies pursued by the automotive industry for fuel economy and vehicle safety. In this context, medium manganese (Mn) steels containing 3 to 12 wt.% Mn are one of the strong candidates for the so-called third-generation advanced high-strength steels (AHSS), due to the superior mechanical properties exceeding the first-generation AHSS and the potentially lower cost compared to the high Mn second-generation AHSS. The ultrafine grain size and high fraction of retained austenite, adjustable to various TRIP (transformation-induced plasticity) and/or TWIP (twinning-induced plasticity) effects, constitute the key advantages of this group of steels. This thesis aims to develop a better understanding of the processing-microstructure-property relationship of medium Mn steels with Al and Si additions. Four experimental steels with compositions of Fe-0.2C-(7~10)Mn-3Al-(0~3)Si (in wt.%) were designed and examined. The phase transformation behavior, with respect to austenite formation and decomposition, of two hot rolled samples with 3 wt.% Al and 3 wt.% Si during intercritical annealing was firstly investigated to develop a better understanding of microstructural control for such steels. The microstructure of the leaner alloy with 7 wt.% Mn was substantially influenced by the annealing temperature, whereas the richer variant 10 wt.% Mn steel exhibited a stable ferrite-austenite duplex microstructure containing a fixed amount of retained austenite, which was found to be independent of the variations of annealing temperature. From these results, controlled annealing was performed for these two hot rolled samples, followed by a further processing by subjecting them to cold rolling and examining the microstructural evolution during cold rolling. Strain partitioning, between austenite and ferrite, and deformation twinning of austenite were found to critically influence the cold rollability of the two steels. Finally, the deformation and fracture mechanisms of the cold rolled and intercritical annealed medium Mn steels were studied, with particular emphasis on the effect of different Si additions (0~3 wt.%). Results showed that the mechanical property of the steels critically depended on the austenite fraction, TRIP and TWIP effect activated in austenite, as well as the strain partitioning between austenite and ferrite during deformation. The fracture mechanisms altered with different Si levels, which can change from dimpled-type fracture driven by void formation, mainly at the ferrite/strain-induced [alpha]′-martensite interfaces, to a combined dimple and cleavage/quasi- cleavage fracture, which was related to the brittle [delta]-ferrite in high Si alloys. The work also revealed a strong correlation between strain-induced martensite formation and the serrated plastic flow phenomenon associated with the Portevin-Le Chatelier effect (PLC) effect. Discontinuous behavior of strain-induced transformation was observed, which was due to the localized martensite formation within the PLC bands nucleating intermittently and propagating continuously during tensile straining. " --
Microstructural Evolution During High Frequency Post Weld Impact Treatments For High Strength Steels
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Author :
language : en
Publisher:
Release Date : 2015
Microstructural Evolution During High Frequency Post Weld Impact Treatments For High Strength Steels written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Thermomechanical Processing Of Steels
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Author : Jose M. Rodriguez-Ibabe
language : en
Publisher: MDPI
Release Date : 2020-11-18
Thermomechanical Processing Of Steels written by Jose M. Rodriguez-Ibabe and has been published by MDPI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-11-18 with Technology & Engineering categories.
This book gathers a collection of papers summarizing some of the latest developments in the thermomechanical processing of steels. The replacement of conventional rolling plus post-rolling heat treatments by integrated controlled forming and cooling strategies implies important reductions in energy consumption, increases in productivity and more compact facilities in the steel industry. The metallurgical challenges that this integration implies, though, are relevant and impressive developments that have been achieved over the last 40 years. The frequency of the development of new steel grades and processing technologies devoted to thermomechanically processed products is increasing, and their implementation is being expended to higher value added products and applications. In addition to the metallurgical peculiarities and relationships between chemical composition, process and final properties, the relevance impact of advanced characterization techniques and innovative modelling strategies provides new tools to achieve the further deployment of the TMCP technologies. The contents of the book cover low carbon microalloyed grades, ferritic stainless steels and Fe–Al–Cr alloys, medium-Mn steels, and medium carbon grades. Authors of the chapters of this "Thermomechanical Processing of Steels" book represent some of the most relevant research groups from both the steel industry and academia.