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<p>This study focuses on the microstructure and texture development of thin-gauge non-oriented electrical steels, which are increasingly used in rotating motors for new energy vehicles. While their microstructure and texture should be similar to their conventional thickness counterparts, differences arise due to the thinner hot-rolled sheets, higher cold rolling reductions, and possible surface effects of final sheets annealed at high temperatures. In this work, a 2.1-mm-thick thin-gauge hot-rolled sheet from industry was subjected to normalization annealing in laboratory to prepare various initial grain sizes. Subsequently, these sheets were cold rolled with an 87.1% reduction to a thickness of 0.27&#xa0;mm, followed by annealing at different temperatures and holding times to investigate microstructure and texture evolution. The results demonstrate that as initial grain sizes increase, the final annealing textures exhibit significant improvement with a higher presence of {100} &lt; 021 &gt; or {114} &lt; 481 &gt; components. In contrast, the final grain sizes are influenced by both initial grain sizes and final annealing temperature or holding time due to grain growth. Increasing the annealing temperature from 800 to 960&#xa0;°C leads to an approximately fivefold coarsening of the average grain sizes, while increasing the holding time at 960&#xa0;°C from 3 minutes to 10 minutes results in a roughly 1.5 to 2 times coarsening of the average grain size, as well as an increase in the number of grains touching the sheet surface from 71 to 94%. The final textures observed are clearly the result of grain growth rather than recrystallization. Additionally, larger initial grain sizes exhibit improved magnetic properties due to enhanced {100} &lt; 021 &gt; or {114} &lt; 481 &gt; texture.</p>

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Influence of Initial Grain Size, Annealing Temperature, and Time on the Microstructure and Texture in a Thin-Gauge Non-oriented Electrical Steel

  • 期刊论文

  • 发表日期：

    2026年5月23日

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  • Z. X. Yi,
  • Y. L. Feng,
  • Q. Y. Kuang,
  • H. Wang,
  • P. Yang,
  • Y. Q. Tang,
  • Z. C. Li

摘要

This study focuses on the microstructure and texture development of thin-gauge non-oriented electrical steels, which are increasingly used in rotating motors for new energy vehicles. While their microstructure and texture should be similar to their conventional thickness counterparts, differences arise due to the thinner hot-rolled sheets, higher cold rolling reductions, and possible surface effects of final sheets annealed at high temperatures. In this work, a 2.1-mm-thick thin-gauge hot-rolled sheet from industry was subjected to normalization annealing in laboratory to prepare various initial grain sizes. Subsequently, these sheets were cold rolled with an 87.1% reduction to a thickness of 0.27 mm, followed by annealing at different temperatures and holding times to investigate microstructure and texture evolution. The results demonstrate that as initial grain sizes increase, the final annealing textures exhibit significant improvement with a higher presence of {100} < 021 > or {114} < 481 > components. In contrast, the final grain sizes are influenced by both initial grain sizes and final annealing temperature or holding time due to grain growth. Increasing the annealing temperature from 800 to 960 °C leads to an approximately fivefold coarsening of the average grain sizes, while increasing the holding time at 960 °C from 3 minutes to 10 minutes results in a roughly 1.5 to 2 times coarsening of the average grain size, as well as an increase in the number of grains touching the sheet surface from 71 to 94%. The final textures observed are clearly the result of grain growth rather than recrystallization. Additionally, larger initial grain sizes exhibit improved magnetic properties due to enhanced {100} < 021 > or {114} < 481 > texture.