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<p>The effect of Al content on the precipitation and growth of AlN and MnS inclusions for Fe–5Mn–<i>x</i>Al–0.15C (<i>x&#xa0;</i>=&#xa0;0.018, 0.95, 1.93, 2.97 pct) medium Mn steel solidification was investigated under as-cast conditions by a coupling model and experimental observation. In the coupling model, firstly, the real diffusion of all solute elements in all solid and liquid phases is quantitatively considered for the actual temperature gradients during solidification to predict the phase transition temperatures by diffusion module (DICTRA). And then these temperatures were used in Clyne–Kurz model. Meanwhile, the effect of the precipitation of AlN and MnS on the micro-segregation of solutes Al, N, Mn, and S is also considered in Clyne–Kurz model. Finally, based on the solute concentrations (by Clyne–Kurz model), the growth behaviors of AlN and MnS during solidification were further predicted by growth kinetics model. The results showed that, with the increasing of Al content from 0.018 to 2.97 pct, the temperature range for the solidification process of medium Mn steel increased from 76.0&#xa0;°C to 109.6&#xa0;°C. With considering the precipitation of AlN, the concentration of solute N of 2.97 pct Al steel has a large decreasing (77.8 pct), when the solid fraction (<i>f</i><sub><i>s</i></sub>) was 1. Based on the growth kinetics model, with the increasing of Al content, the predicting maximum radius of AlN increased from 2.9 to 7.0 <i>μ</i>m, and the predicting maximum radius of MnS also increased, from 3.1 to 5.3 <i>μ</i>m. In 2.97 pct Al steel, the higher concentration difference (between the actual concentration and the equilibrium concentration) of limiting element N (0.0066 wt pct) and the longer local growth time of AlN (34.0 seconds) provided the larger growth driving force of AlN, leading the larger size. The predicting maximum sizes of AlN and MnS inclusions were calculated using the coupling model have a relatively good agreement with values obtained by experimental observation in different Al content specimens.</p>

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A Coupling Model Predicting the Precipitation and Growth of AlN and MnS Inclusions in Fe–5Mn–xAl–0.15C Medium Mn Steels

  • 期刊论文

  • 发表日期：

    2025年2月12日

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  • Li-Bin Jin,
  • Shu-Guo Zheng,
  • Miao-Yong Zhu

摘要

The effect of Al content on the precipitation and growth of AlN and MnS inclusions for Fe–5Mn–xAl–0.15C (x = 0.018, 0.95, 1.93, 2.97 pct) medium Mn steel solidification was investigated under as-cast conditions by a coupling model and experimental observation. In the coupling model, firstly, the real diffusion of all solute elements in all solid and liquid phases is quantitatively considered for the actual temperature gradients during solidification to predict the phase transition temperatures by diffusion module (DICTRA). And then these temperatures were used in Clyne–Kurz model. Meanwhile, the effect of the precipitation of AlN and MnS on the micro-segregation of solutes Al, N, Mn, and S is also considered in Clyne–Kurz model. Finally, based on the solute concentrations (by Clyne–Kurz model), the growth behaviors of AlN and MnS during solidification were further predicted by growth kinetics model. The results showed that, with the increasing of Al content from 0.018 to 2.97 pct, the temperature range for the solidification process of medium Mn steel increased from 76.0 °C to 109.6 °C. With considering the precipitation of AlN, the concentration of solute N of 2.97 pct Al steel has a large decreasing (77.8 pct), when the solid fraction (fs) was 1. Based on the growth kinetics model, with the increasing of Al content, the predicting maximum radius of AlN increased from 2.9 to 7.0 μm, and the predicting maximum radius of MnS also increased, from 3.1 to 5.3 μm. In 2.97 pct Al steel, the higher concentration difference (between the actual concentration and the equilibrium concentration) of limiting element N (0.0066 wt pct) and the longer local growth time of AlN (34.0 seconds) provided the larger growth driving force of AlN, leading the larger size. The predicting maximum sizes of AlN and MnS inclusions were calculated using the coupling model have a relatively good agreement with values obtained by experimental observation in different Al content specimens.