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<p>Sulfur segregation at grain boundaries induces hot brittleness in steel, necessitating strict control of sulfur content in conventional non-oriented silicon steel. The ultra-rapid solidification characteristics of the planar flow casting process can effectively inhibit sulfur segregation, therefore avoiding hot brittleness of silicon steel ribbons caused by sulfur. The effect of sulfur segregation/precipitation on surface quality, microstructure and magnetic properties of Fe–3%Si ultra-thin ribbons prepared with planar flow casting process is systematically investigated. Results indicate that extensive precipitation of FeS at grain boundaries and internal stresses induced by non-uniform solidification shrinkage leads to crack formation in 0.1%S ribbons. At 0.03%S, nanoscale precipitates (primarily FeS and MnS) distribute uniformly, when sulfur content exceeds 0.06%, and diffuse sulfur aggregation zones emerge. {001} &lt; 100 &gt; texture strength and magnetic induction of 0.03%S ribbons increase due to the optimized texture. Compared to 0%S ribbons, the magnetic induction of 0.03%S ribbons increases from 1.598 to 1.608&#xa0;T. Higher sulfur raises iron loss due to increased grain boundaries and impeded magnetic domain motion. After annealing, 0.03%S ribbons achieve a magnetic induction of 1.625&#xa0;T, attributed to sulfur inhibiting undesirable {110} and {111} grain growth. However, excessive sulfur restricts grain growth and texture evolution. Fe–3%Si–0.03%S ribbons possess the best magnetic properties after annealing at 1075&#xa0;°C, with a magnetic induction of 1.625&#xa0;T, higher than 1.603&#xa0;T of Fe–3%Si ribbons as well as a greater iron loss (17.51 W/kg <i>vs</i>. 12.33 W/kg).</p>

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Effect of sulfur segregation/precipitation on microstructure and magnetic properties of Fe–3%Si non-oriented silicon steel ultra-thin ribbons prepared with planar flow casting

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Zhi-Xiang Liu,
  • De-Ming Xu,
  • Si-Qian Bao,
  • Geng-Wei Yang,
  • Qing-Ming Chang

摘要

Sulfur segregation at grain boundaries induces hot brittleness in steel, necessitating strict control of sulfur content in conventional non-oriented silicon steel. The ultra-rapid solidification characteristics of the planar flow casting process can effectively inhibit sulfur segregation, therefore avoiding hot brittleness of silicon steel ribbons caused by sulfur. The effect of sulfur segregation/precipitation on surface quality, microstructure and magnetic properties of Fe–3%Si ultra-thin ribbons prepared with planar flow casting process is systematically investigated. Results indicate that extensive precipitation of FeS at grain boundaries and internal stresses induced by non-uniform solidification shrinkage leads to crack formation in 0.1%S ribbons. At 0.03%S, nanoscale precipitates (primarily FeS and MnS) distribute uniformly, when sulfur content exceeds 0.06%, and diffuse sulfur aggregation zones emerge. {001} < 100 > texture strength and magnetic induction of 0.03%S ribbons increase due to the optimized texture. Compared to 0%S ribbons, the magnetic induction of 0.03%S ribbons increases from 1.598 to 1.608 T. Higher sulfur raises iron loss due to increased grain boundaries and impeded magnetic domain motion. After annealing, 0.03%S ribbons achieve a magnetic induction of 1.625 T, attributed to sulfur inhibiting undesirable {110} and {111} grain growth. However, excessive sulfur restricts grain growth and texture evolution. Fe–3%Si–0.03%S ribbons possess the best magnetic properties after annealing at 1075 °C, with a magnetic induction of 1.625 T, higher than 1.603 T of Fe–3%Si ribbons as well as a greater iron loss (17.51 W/kg vs. 12.33 W/kg).