The influence of internal oxidation during decarburization of a grain oriented silicon steel on the morphology of the glass film formed at high temperature annealing

Silveira, Carolina Cesconetto; Cunha, Marco Antônio da; Buono, Vicente Tadeu Lopes

doi:10.1016/j.jmmm.2014.01.019

Cited by 24 publications

(10 citation statements)

References 9 publications

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“…The oxide layer formed by reaction between the outer surface of the sheet and atmospheric oxygen must be removed after hot stamping and has a deleterious effect on the dimensional accuracy of the product [147]. The inner decarburisation layer is caused by the loss of carbon and not only reduces the strength, but also increases the shear rate, which promotes crack growth and reduces the fatigue resistance of the hot-stamped material [148,149]. In addition, both the oxidation and the decarburisation layer affect the heat transfer during die quenching, deceasing productivity.…”

Section: Application Of Low-temperature Hot Stamping Process In Medium-mn Steelmentioning

confidence: 99%

New Developments and Future Trends in Low-Temperature Hot Stamping Technologies: A Review

Tong

Rong

Yardley

et al. 2020

Metals

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Improvement of the hot stamping process is important for reducing processing costs and improving the productivity and tensile properties of final components. One major approach to this has been to conduct all or part of the process at lower temperatures. The present paper reviews the state of the art of hot stamping techniques and their applications, considering the following aspects: (1) conventional hot stamping and its advanced developments; (2) warm stamping approaches in which complete austenitisation is not attained during heating; (3) hot stamping with a lower forming temperature, i.e., low-temperature hot stamping (LTHS); (4) advanced medium-Mn steels with lower austenitisation temperatures and their applicability in LTHS. Prospects for the further development of LTHS technology and the work required to achieve this are discussed.

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Section: Application Of Low-temperature Hot Stamping Process In Medium-mn Steelmentioning

confidence: 99%

New Developments and Future Trends in Low-Temperature Hot Stamping Technologies: A Review

Tong

Rong

Yardley

et al. 2020

Metals

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“…Zoom on contact part in order to create an elastic tensile stress and to decrease the core losses. Obviously, the main interest of GO electrical steel for die cast copper is the first part of insulation coating because of its high temperature resistance property [32]. In order to validate the possibility of using GO electrical steel with die casting copper process, heating tests are realized on standardized samples [33].…”

Section: B Using Go Materials With Die Casting Copper Processmentioning

confidence: 99%

Increasing the Energy Efficiency of Induction Machines by the Use of Grain-Oriented Magnetic Materials and Die Casting Copper Squirrel Cage in the Rotor

Mallard

Parent

Demian

et al. 2019

IEEE Trans. on Ind. Applicat.

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This paper deals with an induction machine whose squirrel cage is made of copper obtained by die casting process. The major issue of this process is the thermal shock suffered by the laminations, leading to the deterioration of insulation coating as well as the generation of interbar currents, those currents being responsible for addition stray losses. This issue can be counteracted by using grain oriented laminations on the rotor. In particular, the paper highlights that due to the specificity of the insulation coating of that kind of electrical steel it does not suffer from the thermal shock. It is shown that using a squirrel cage made of copper combined to grain oriented laminations in the rotor leads to a decrease of both core losses and stray load losses and an increase of the efficiency of 1.6%.

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“…A função da forsterita é isolar eletricamente o aço, proteger contra a oxidações e reduzir a perda magnética devido a tensões aplicadas no aço, causadas pela a diferença de coeficiente de expansão térmica da forsterita e do aço elétrico [17]. Silveira et al [18] investigam a formação desses óxidos sob diferentes condições de pH2O/pH2 e temperatura de descarbonetação. Imagem de microscopia eletrônica de varredura de um micro corte na sessão transversal, Figura 5 mostram os aspectos morfológicos da subcamada de óxidos formada e os resultados das análises da espectroscopia por energia dispersiva de raio X (EDX) realizadas em microscopia eletrônica de transmissão nas posições indicadas na Figura 6 sugerem as possíveis fases desses óxidos, Tabela 1.…”

Section: Efeito Da Atmosfera Gasosa Na Oxidação Superficial Dos Aços unclassified

Aplicação Da Termodinâmica Computacional No Processamento E Tratamentos Térmicos De Aços Elétricos Com 2-3%si

Vieira¹,

Silva²

2014

ABM Proceedings

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ResumoO acirramento da competição no mercado de aço tem exigido esforços de inovação e redução de custos. Por sua vez, as técnicas agrupadas como ICME -Integrated Computational Materials Engineering vêm acelerando o desenvolvimento e a otimização de materiais e processos de fabricação. O emprego destas técnicas tem sido uma ferramenta extra para assegurar a competitividade na indústria. Neste trabalho o uso da termodinâmica computacional no desenvolvimento e processamento de aços elétricos é revisado através da discussão de exemplos. Cálculos de equilíbrios mais relevantes para o processo de fabricação destes aços (tanto de grão não orientado-GNO como orientado-GO) permitem obter informações sobre as transformações de fases, solubilização de precipitados (sulfetos e nitretos) essenciais para a obtenção de texturas cristalográficas ideais. Os cálculos são discutidos e comparados com resultados reais. Discutem-se ainda, cálculos no sistema açogás, e os efeitos da composição da atmosfera na formação de óxidos na superfície do aço. Tais cálculos são importantes para descrever previamente as transformações que ocorrem durante as várias etapas de fabricação, assim como os efeitos dos parâmetros de processo sob os aços elétricos. A aplicação da técnica permite otimizar o processamento e o desenvolvimento dos aços elétricos em diversos aspectos. As vantagens e limitações do método, assim como o potencial de outras técnicas de ICME, na área, são discutidas. Palavras-chave: Aços elétricos; Termodinâmica computacional; Transformação de fases, Oxidação. APPLICATION OF COMPUTATIONAL THERMODYNAMICS IN PROCESSING AND HEAT TREATMENTS OF 2-3WT.% ELECTRICAL STEELS AbstractThe competition in the steel market has demanding innovation and cost reduction efforts. On the other hand, approaches such as ICME -Integrated Computational Materials Engineering has receiving international attention due to its great potential to shorten product and process development time, while lowering cost and improving outcome. In this work, the use of computational thermodynamics in the development and processing of electrical steels is reviewed by examples discussions. Equilibrium calculations for relevant manufacturing process of electrical steels (grain non-oriented GNO and grain oriented GO) provided information about the phase transformations and precipitate solubilization (nitrides and sulfides) for several chemical compositions. Such parameters are essential to drive the pathway to get ideal crystallographic textures. The calculations are discussed and compared with experimental results of commercial electrial steels. Furthermore, calculations involving steel-gas system were performed, and the effects of gases compositions in the atmosphere on the formation of oxides in surface layer of the steel were discussed. Such calculations are important for previously describing the transformations that occur during the various stages of manufacturing process, as well as the effects of process parameters on properties of such steel. The application of the te...

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The influence of internal oxidation during decarburization of a grain oriented silicon steel on the morphology of the glass film formed at high temperature annealing

Cited by 24 publications

References 9 publications

New Developments and Future Trends in Low-Temperature Hot Stamping Technologies: A Review

New Developments and Future Trends in Low-Temperature Hot Stamping Technologies: A Review

Increasing the Energy Efficiency of Induction Machines by the Use of Grain-Oriented Magnetic Materials and Die Casting Copper Squirrel Cage in the Rotor

Aplicação Da Termodinâmica Computacional No Processamento E Tratamentos Térmicos De Aços Elétricos Com 2-3%si

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