Effect of Rolling Reduction and Temperature on the Oxide Scale of Hot Rolled Mild Steel Strip

Han, Huiquan; Zhou, Tianpeng; Wang, Wan‐Hui; Yang, Chunmei

doi:10.1590/1980-5373-mr-2019-0083

Cited by 4 publications

(2 citation statements)

References 15 publications

(18 reference statements)

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“…O processo de laminação inevitavelmente irá afetar os óxidos de ferro na superfície do aço da tira. Além disso, a morfologia dos óxidos de ferro na tira de aço, está diretamente ligada à temperatura de laminação, redução de espessura na laminação e a espessura do óxido ferro [5].…”

Section: Introductionunclassified

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Aplicação De Rede Neural Artificial Na Predição Do Defeito Carepa Na Laminação De Tiras a Quente

Rodrigues,

Possatti,

Messner

et al. 2023

ABM Proceedings

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ResumoEste estudo demonstra a aplicação de uma rede neural artificial (RNA) na predição do defeito carepa, na laminação de tiras quentes. A geração da carepa é inerente ao processo pela afinidade do ferro com o oxigênio em altas temperaturas. Manter o nível deste defeito sob controle e atendendo às especificações da aplicação final, evitam o desperdício com a desclassificação de material. Baseado em uma produção de 6.200 bobinas, foram coletados os parâmetros de temperaturas de processamento e quilometragem dos cilindros, resultando em 43 variáveis de entradas e 4 defeitos de saída. Após as simulações da RNA com 3 funções de ativação, 2 otimizadores e 2 quantidades de neurônios, adotou-se a função de ativação logistic com o otimizador lbfgs e uma camada com 87 neurônios. A performance da RNA foi avaliada por meio da matriz de confusão, obtendo-se uma acurácia de 81%, precisão média 54%, recall médio de 51% e média harmônica (f1score) de 52%. A RNA demonstra um desempenho excelente na predição da não ocorrência do defeito, obtendo-se 90% média harmônica (f1-score). Contudo, devese dar continuidade no aprendizado da rede para que a métrica recall tenha melhores resultados evitando-se classificar produtos com defeito como isentos de defeito.

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Section: Introductionunclassified

“…A relação da espessura da carepa, temperatura de laminação e percentual de redução de espessura. Fonte: [5].…”

Section: Introductionunclassified

Aplicação De Rede Neural Artificial Na Predição Do Defeito Carepa Na Laminação De Tiras a Quente

Rodrigues,

Possatti,

Messner

et al. 2023

ABM Proceedings

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Investigation of the Thermal Deformation Behavior Exhibited by Oxidation Products in Fe–Si Alloys

Cao,

Zhao,

Shan

et al. 2024

High Temperature Corrosion of mater.

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The thermal deformation behavior of oxidation products from Fe-Si alloys with varying Si contents was systematically investigated using a thermal simulation testing machine during compressive deformation at temperatures ranging from 800 to 1100 ℃. The results indicate that FeO exhibits excellent plastic deformation ability and is the primary component undergoing deformation during the thermal process.The plasticity of the oxide product improves with higher deformation temperature, as does the coordination between the oxide product and matrix, and interface straightness. However, an increase in Si content leads to a decrease in FeO content within the oxide product, resulting in reduced overall plastic deformation ability and reduced deformation coordination of oxidation products with the substrate. At the interface, Fe 2 SiO 4 forms a spinel solid solution composed of Fe 2 SiO 4 with FeO and SiO 2 that possesses a certain plastic deformation ability due to its FeO content. Moreover, the rise in Si content leads to an increased concentration of point defects in FeO near the interface side of the matrix, thereby facilitating dislocation climbing of FeO and resulting in a steady-state increase in plastic deformation.Thus the increase in the concentration of cationic defects in FeO due to the elevated Si content and the generation of Fe 2 SiO 4 solid solution at the interface between the oxidation products and the substrate are the main reasons for the improvement in the atness of the interface between the oxidation products and the substrate.

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Investigation of the thermal deformation behavior exhibited by oxidation products in Fe-Si alloys

Cao,

Zhao,

Shan

et al. 2023

Preprint

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The thermal deformation behavior of oxidation products from Fe-Si alloys with varying Si contents was systematically investigated using a thermal simulation testing machine during compressive deformation at temperatures ranging from 800 to 1100 ℃. The results indicate that FeO exhibits excellent plastic deformation ability and is the primary component undergoing deformation during the thermal process. The plasticity of the oxide product improves with higher deformation temperature, as does the coordination between the oxide product and matrix, and interface straightness. However, an increase in Si content leads to a decrease in FeO content within the oxide product, resulting in reduced overall plastic deformation ability and reduced deformation coordination of oxidation products with the substrate. At the interface, Fe2SiO4 forms a spinel solid solution composed of Fe2SiO4 with FeO and SiO2 that possesses a certain plastic deformation ability due to its FeO content. Moreover, the rise in Si content leads to an increased concentration of point defects in FeO near the interface side of the matrix, thereby facilitating dislocation climbing of FeO and resulting in a steady-state increase in plastic deformation. Thus the increase in the concentration of cationic defects in FeO due to the elevated Si content and the generation of Fe2SiO4 solid solution at the interface between the oxidation products and the substrate are the main reasons for the improvement in the flatness of the interface between the oxidation products and the substrate.

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Effect of Rolling Reduction and Temperature on the Oxide Scale of Hot Rolled Mild Steel Strip

Cited by 4 publications

References 15 publications

Aplicação De Rede Neural Artificial Na Predição Do Defeito Carepa Na Laminação De Tiras a Quente

Aplicação De Rede Neural Artificial Na Predição Do Defeito Carepa Na Laminação De Tiras a Quente

Investigation of the Thermal Deformation Behavior Exhibited by Oxidation Products in Fe–Si Alloys

Investigation of the thermal deformation behavior exhibited by oxidation products in Fe-Si alloys

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