Thermomechanical Processing of Microalloyed Austenite PDF Download

Author: Anthony J. DeArdo
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 734

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Author: International Conference of the Thermomechanical P
Publisher:
ISBN: 9780783722115
Category :
Languages : en
Pages : 696

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Author:
Publisher:
ISBN: 9780895203984
Category :
Languages : en
Pages :

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Author: A. J. DeArdo
Publisher:
ISBN:
Category : Austenite
Languages : en
Pages : 682

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Author: Imao Tamura
Publisher: Butterworth-Heinemann
ISBN: 1483164055
Category : Technology & Engineering
Languages : en
Pages : 257

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Book Description
Thermomechanical Processing of High-Strength Low-Alloy Steels considers some advanced techniques and metallurgical bases for controlled-rolling. This book contains 12 chapters. In Chapter 1, the purpose of thermomechanical processing and historical survey is described, while in Chapter 2, the kinetics of phase transformations and refinement of grain size in steels are elaborated. The techniques and metallurgical bases for controlled-rolling in the recrystallization, non-recrystallization, and (? + y) regions are reviewed in Chapters 3 to 5. Chapters 6 and 7 discuss the deformation resistance during hot-rolling and restoration processes. The phase transformations during cooling following hot-rolling are mentioned in Chapter 8, followed by a summarization of the effects of alloying elements in Chapter 9. Chapters 10 and 11 deal with the mechanical properties of controlled-rolled steel and prediction and control of microstructure and properties by thermomechanical processes. The problems faced and possibilities for future developments are stated in the last chapter. This publication is recommended for physicists, metallurgists, and researchers concerned with controlled-rolling, including non-specialists who have some knowledge of metallurgy.

Author: Jose M. Rodriguez-Ibabe
Publisher: MDPI
ISBN: 3039433547
Category : Technology & Engineering
Languages : en
Pages : 210

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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.

Author: Blake Whitley
Publisher:
ISBN:
Category : Austenite
Languages : en
Pages : 172

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Author: C. Sommitsch
Publisher: Trans Tech Publications Ltd
ISBN: 3035731292
Category : Technology & Engineering
Languages : en
Pages : 2720

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This book presents the proceedings of the 9-th International Conference on Processing and Manufacturing of Advanced Materials – THERMEC’2016, which took place between May 29 and June 3, 2016 in Graz, Austria, under the co-sponsorship of The Minerals, Metals & Materials Society (TMS), USA. The Conference was also under the international auspices of professional organizations from Japan, Korea, France, Italy, The Netherlands, Germany, Brazil, Austria, India, and Canada. The Conference was intended to bring together the researchers and engineers/technologists working in different aspects of processing, fabrication, structure/property evaluation and applications of both ferrous and nonferrous materials including biomaterials, and smart/intelligent materials as well as the advanced characterisation techniques. In addition to the contributed papers, the conference committee included in the final program the invited presentations by active researchers from various countries in several topic areas covered at THERMEC’2016.

Author: Martin Peter Black
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages :

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"The study of the physical metallurgy of microalloyed steels has been an important field of research for nearly forty years. During this time the hot working characteristics have been comprehensively investigated, simulated and modelled. Unfortunately, the actual microstructural behaviour during hot working cannot be followed completely due to the unavoidable phase transformation of these steels upon cooling. This transformation prohibits direct study of the deformed austenite, by disordering the dislocation structures developed during hot working. In order to avoid the problem of transformation, a model alloy has been developed. This allows the retention of the austenitic structure to room temperature, while retaining similar thermodynamic and deformational properties to conventional microalloyed steels. The alloy was based on a matrix of iron with 30wt. % nickel, and niobium and carbon additions to the level of 0.1% and 0.09% respectively. The use of such an alloy to simulate the hot working behaviour of traditional microalloyed steels means that the study of softening and precipitation events in the austenite matrix is possible as the phase transformation is avoided. The Fe-30%Ni-Nb alloy has undergone thermomechanical processing. Hot plane strain compression tests have been carried out in order to study the precipitation kinetics. Before testing, the material was solution treated at 1250°C to allow supersaturation of the niobium at lower temperatures. Double-deformation plane strain compression testing has been carried out over a range of temperatures (900-1050°C) at a strain rate of 10s 1 and with delay times between deformations varying from is to 1000s. This testing has allowed the study of both the static precipitation and recrystallisation kinetics from the resulting flow stress behaviour. Precipitation has been evident from the stress-strain curves. Transmission electron microscopy of thin foils of the hot-worked material has been completed to investigate the dislocation structures produced. This shows the presence of a microbanded substructure. The particle populations have been studied using conventional transmission electron microscopy. Direct observation of particles precipitated in the austenite matrix has been achieved by electron spectroscopic imaging studies of the as-deformed material. This is important, as it shows preferential precipitation upon the dislocation structure, and not within the matrix. The overall study shows that the iron-nickel alloy is a good model austenite in many respects. It has similar hot-working characteristics: deformation behaviour, work hardening response, and recrystallisation behaviour. The present work also reports similar NbC precipitation behaviour to that found in conventional C-Mn based microalloyed steels. It appears that the alloy is an excellent model for microalloyed austenite under hot-working conditions, and should prove to be a valuable material for future investigations." -- Abstract.

Author: Carlos Garcia-Mateo
Publisher: MDPI
ISBN: 3039288571
Category : Technology & Engineering
Languages : en
Pages : 166

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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.