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<p>The improvement of M<sub>2</sub>B morphology in Fe-B-C alloys plays a decisive role in enhancing their service life. The heterogeneous nucleation of <i>α</i>-MnS and growth inhibition via K adsorption are beneficial to improving the structural morphology of M2B. In this paper, such a dual modification mechanism is achieved by introducing K<sub>2</sub>SO<sub>4</sub>. Results reveal that K<sub>2</sub>SO<sub>4</sub> promotes the formation of <i>α</i>-MnS as heterogeneous nuclei and K-rich adsorption films, effectively refining and spheroidizing the M<sub>2</sub>B phase. The shape factor of M<sub>2</sub>B increases from 0.13 to 0.44, while its grain factor decreases from 25.23 to 18.87&#xa0;μm. First-principles calculations confirm that K preferentially adsorbs at the B-terminated interface, and the <i>α</i>-MnS exhibits strong bonding with the M<sub>2</sub>B, elucidating the dual mechanism of heterogeneous nucleation and growth inhibition. This work provides insights for designing high-performance Fe-B-C alloy.</p>

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Dual Mechanisms of M2B Phase Control in Fe-B-C Alloy: Heterogeneous Nucleation by α-MnS and Growth Inhibition via K Adsorption

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • Zhong Liqiong,
  • Xiao Qiang,
  • Jin Fengshuo,
  • Zhou Dakui,
  • Lai Weiji,
  • Yi Yanliang

摘要

The improvement of M2B morphology in Fe-B-C alloys plays a decisive role in enhancing their service life. The heterogeneous nucleation of α-MnS and growth inhibition via K adsorption are beneficial to improving the structural morphology of M2B. In this paper, such a dual modification mechanism is achieved by introducing K2SO4. Results reveal that K2SO4 promotes the formation of α-MnS as heterogeneous nuclei and K-rich adsorption films, effectively refining and spheroidizing the M2B phase. The shape factor of M2B increases from 0.13 to 0.44, while its grain factor decreases from 25.23 to 18.87 μm. First-principles calculations confirm that K preferentially adsorbs at the B-terminated interface, and the α-MnS exhibits strong bonding with the M2B, elucidating the dual mechanism of heterogeneous nucleation and growth inhibition. This work provides insights for designing high-performance Fe-B-C alloy.