Étude de la plasticité d’inclusions d’oxydes

Bernard, G.; Riboud, Paul Victor; Urbain, G.

doi:10.1051/metal/198178050421

Cited by 54 publications

(33 citation statements)

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“…It was indicated that the inclusions in Heat 1 were rolled to chain‐like shapes, and presented a larger elongation ratio, while the inclusions in Heat 2 were rolled to ellipse shape and showed a smaller elongation ratio. The morphology of inclusions after hot‐working process had been fully detailed by Bernard . The inclusions in the current two heats belonged to the single‐phase inclusions with different deformabilities.…”

Section: Resultsmentioning

confidence: 99%

Effect of Oxide Inclusions on the Magnetic Properties of Non‐Oriented Electrical Steel

Ren

Zhang

Yang

2018

steel research int.

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A plant experiment is conducted to study the effect of oxide inclusions on the magnetic properties of non‐oriented electrical steel. The morphology, size, and composition of oxide inclusions are investigated by an automated scanning electron microscope. In the liquid steel, the increase of the content of CaO in oxide inclusions promotes the inclusion size and decreases the width of the size distribution. Besides, the viscosity of oxide inclusions plays a key role on the deformation during the hot rolling process at 1000 °C. When the viscosity of inclusions is larger than that of the steel matrix, the oxide inclusions are nearly undeformed. While when the viscosity of inclusions is lower than that of the steel matrix, the inclusions are deformed into chain‐like shape and the elongation ratio increases with the decreasing of viscosity. Additionally, deformed oxide inclusions perform a greater pinning force on the moving of grain boundaries, which is verified by the measured results of the grain size. Thus, in terms of increasing the magnetic properties, the viscosity of oxide inclusions shall be controlled to larger than that of the steel matrix by adjusting the inclusion composition.

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Section: Resultsmentioning

confidence: 99%

Effect of Oxide Inclusions on the Magnetic Properties of Non‐Oriented Electrical Steel

Ren

Zhang

Yang

2018

steel research int.

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“…O produto final solidificado possui inclusões destas três fases, mas a sílica em menor quantidade. As fases wollastonita e anorthita são deformáveis e não apresentam problemas na laminação [10]. A figura 8 apresenta o resfriamento a partir do ponto C. Neste caso, a solidificação completa dos óxidos ocorre somente abaixo de 1100°C.…”

Section: Formação Das Inclusõesunclassified

“…Além do ponto de fusão das inclusões, importante na etapa de lingotamento contínuo, é necessário avaliar as diferentes fases sólidas e suas deformabilidades, para que sejam adequadas à laminação. No sistema SiO 2 -MnO-Al 2 O 3 as inclusões deformáveis encontram-se na região central do diagrama de fases, e compreendem as fases tridimita, rhodonita, mulita e espessartita [10]. Já no sistema SiO 2 -MnOAl 2 O 3 -CaO, as fases preferenciais são wollastonita, pseudowollastonita e anorthita [9].…”

Section: Introductionunclassified

Estudo Termodinâmico De Inclusões Nãometálicas Na Produção De Aços Dual-Phase Com Alto Teor De Silício

Beltrami¹,

Bielefeldt²,

Vilela³

2017

Anais Do Seminário De Aciaria, Fundição E Metalurgia De Não-Ferrosos

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ResumoO trabalho estudou a formação, a interação com a escória e a solidificação de inclusões geradas durante o processamento de aços dual-phase com alto teor de silício (>1%). A composição destes aços, se não bem controlada, pode gerar inclusões sólidas de sílica pura durante o lingotamento contínuo. Para o estudo, foram feitas simulações termodinâmicas com o software computacional FactSage 6.4. As simulações mostraram que os fatores mais importantes para a composição inicial das inclusões é a relação %Mn/%Si e o teor de alumínio dissolvido no aço. Ao interagir com a escória, a tendência é que as inclusões se aproximem da sua composição ao longo do tempo. Durante a solidificação, a maioria das inclusões apresentou fases deformáveis e de baixo ponto de fusão, com exceção das inclusões sem CaO e da inclusão com 25% de Al 2 O 3 e teor intermediário de CaO, que apresentaram as fases tridimita, coríndon e gehlenita de alto ponto de fusão e não-deformáveis. Palavras-chave: Inclusões; Termodinâmica computacional; Sistema SiO 2 -MnOAl 2 O 3 -CaO. THERMODYNAMIC EVALUATION OF NON-METALLIC INCLUSIONS ON HIGH SILICON DUAL-PHASE STEELS PRODUCTION AbstractThis work evaluates the formation, slag interaction and solidification of inclusions generated during the processing of dual-phase steels with high content of silicon (<1% wt). The composition of these steels, if not properly controlled, can produce solid silica inclusions during continuous casting. For the thermodynamic calculations, the commercial software FactSage 6.4 was used. The results show that for the initial composition of inclusion, the most important factors are the %Mn/%Si ratio and the aluminium content of steel. When interacting with the slag, the tendency of the inclusions composition is to equal the slag composition over time. During solidification most of the inclusions presented deformable and low fusion temperature phases, except for inclusions without CaO and with 25%Al 2 O 3 and intermediate CaO content, which formed tridymite, corundum and gehlenite, all phases with high fusion temperature and non-deformable.

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“…Uniaxial tensile tests are simulated assuming different temperatures, strain rates and inclusion sizes as being present in steel matrix. Inclusions considered are spherical and hard (Al 2 O 3 ) with elasto-plastic properties [10] and for the steel matrix visco-plastic properties [11] are assumed. Coulomb friction is used to model the interface behavior and iso-strain model is used to determine the strength of inclusion/matrix composite.…”

Section: Micro-macro Modelmentioning

confidence: 99%

Integrated modeling of steel refining, casting and rolling operations to obtain design set points for quality steel sheet production

Gupta¹,

Kumar²,

Anapagaddi³

et al. 2013

AIP Conference Proceedings

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Non-metallic inclusions are defects present in steel which disrupt the homogeneity of structure and adversely affects the mechanical properties. To some extent silo approach based mathematical models have been successfully used to modify and control inclusions in steel making but very few attempts have been made to deal with these processes in integrated framework. With computational advancement and high promising potential of ICME (Integrated Computational Materials Engineering), physics based models can be integrated which will lead to overall increase of process understanding, control and eventually to better properties and performance of material. The objectives of the present work are: (a) using CFD based models understand the influence of various design and process parameters on inclusion removal during secondary steel making, (b) using FEM model study the effects of type and characteristics of inclusions during solid state forming operations, and finally (c) integrate these models in order to develop an integrated modeling framework. This integrated framework will determine the extent up to which inclusions can be tolerated in downstream processes without affecting the quality and properties of final steel sheet significantly and suggest modifications in upstream processes if inclusions are above acceptable limit.

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Étude de la plasticité d’inclusions d’oxydes

Cited by 54 publications

References 0 publications

Effect of Oxide Inclusions on the Magnetic Properties of Non‐Oriented Electrical Steel

Effect of Oxide Inclusions on the Magnetic Properties of Non‐Oriented Electrical Steel

Estudo Termodinâmico De Inclusões Nãometálicas Na Produção De Aços Dual-Phase Com Alto Teor De Silício

Integrated modeling of steel refining, casting and rolling operations to obtain design set points for quality steel sheet production

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