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<p>The microstructure and chemical composition of hot-rolled Si + Al + Sb electrical steels were modified by a two-stepped annealing conducted before cold rolling. The effects of the changes caused by annealing on the final microstructure and magnetic properties were investigated. Hot-rolled (HR) samples were subjected to a thirty-minute annealing at temperatures between 925 and 1000&#xa0;ºC, followed by a second stage performed at 850&#xa0;°C for 3, 6, and 9&#xa0;h. Heat-treated samples were cold rolled (CR) and subjected to a final annealing (FA) at 850&#xa0;°C for 30&#xa0;min. Results show that magnetic properties of final products are significantly improved by application of the two-stepped annealing to the hot-rolled material, opening the possibility to produce more efficient cores for applications in electrical equipment. The enhancement in magnetic behavior was related to an increase in grain size and a reduction in the amount of carbides, which were modified by the two-stepped annealing applied to the hot-rolled material.</p> Graphical abstract <p></p>

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Influence of annealing in hot-rolled Si + Al + Sb electrical steels on the final microstructure and magnetic properties

  • 期刊论文

  • 发表日期：

    2025年1月3日

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  • A. F. Navarro,
  • A. Salinas,
  • R. Deaquino,
  • F. Hernández,
  • V. E. Salazar,
  • L. Guerra,
  • R. García,
  • A. Bedolla,
  • E. J. Gutiérrez

摘要

The microstructure and chemical composition of hot-rolled Si + Al + Sb electrical steels were modified by a two-stepped annealing conducted before cold rolling. The effects of the changes caused by annealing on the final microstructure and magnetic properties were investigated. Hot-rolled (HR) samples were subjected to a thirty-minute annealing at temperatures between 925 and 1000 ºC, followed by a second stage performed at 850 °C for 3, 6, and 9 h. Heat-treated samples were cold rolled (CR) and subjected to a final annealing (FA) at 850 °C for 30 min. Results show that magnetic properties of final products are significantly improved by application of the two-stepped annealing to the hot-rolled material, opening the possibility to produce more efficient cores for applications in electrical equipment. The enhancement in magnetic behavior was related to an increase in grain size and a reduction in the amount of carbides, which were modified by the two-stepped annealing applied to the hot-rolled material.

Graphical abstract