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<p>In the present work, columnar microstructures were developed in the hot-rolled material by a two-step thermal treatment consisting of two stages: the first one conducted at 1150&#xa0;°C for different times (10, 20, and 30&#xa0;min), followed by a second stage conducted at 850&#xa0;°C for 9&#xa0;h. Samples were then processed by cold rolling and a final thirty-minute annealing conducted at 850, 900, and 950&#xa0;°C. The results show that, although a duplex microstructure consisting of small equiaxed grains and large columnar grains was obtained prior to cold rolling, there was an improvement in the magnetic behavior of the final products compared to those properties obtained in samples processed without modification. The improvement was related to grain size increase and carbides reduction caused by the two-step thermal treatment.</p> Graphical Abstract <p></p>

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Effect of time of a two-step annealing on the microstructure and magnetic properties of non-oriented electrical steels

  • 期刊论文

  • 发表日期：

    2025年2月3日

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  • Edgar Alfaro Juárez,
  • Armando Salinas Rodríguez,
  • Rogelio Deaquino Lara,
  • Fernando Hernández Navarro,
  • Verónica E. Salazar Muñoz,
  • Roel Cruz Gaona,
  • Lizangela Guerra Fuentes,
  • Iván Reyes Domínguez,
  • Emmanuel J. Gutiérrez Castañeda

摘要

In the present work, columnar microstructures were developed in the hot-rolled material by a two-step thermal treatment consisting of two stages: the first one conducted at 1150 °C for different times (10, 20, and 30 min), followed by a second stage conducted at 850 °C for 9 h. Samples were then processed by cold rolling and a final thirty-minute annealing conducted at 850, 900, and 950 °C. The results show that, although a duplex microstructure consisting of small equiaxed grains and large columnar grains was obtained prior to cold rolling, there was an improvement in the magnetic behavior of the final products compared to those properties obtained in samples processed without modification. The improvement was related to grain size increase and carbides reduction caused by the two-step thermal treatment.

Graphical Abstract