Precise control of dissolved nitrogen is required for producing Third-Generation Advanced High-Strength Steels (AHSS). Compared with well-documented thermodynamic data, the data on the kinetics of nitrogen dissolution in these steels are limited. The isotope exchange technique (15N–14N exchange reaction) was applied to measure the nitrogen reaction rate at different temperatures, on pure liquid iron, liquid iron containing different levels of manganese, and liquid Fe-Mn-Al-Si steel with a Third-Generation AHSS composition. The increase in the interfacial reaction rate with increased temperature corresponded to an activation energy of 144.2 kJ/mol for pure iron. For Fe-Mn alloy, the interfacial reaction rate increased with the increased temperature and increased manganese content. For liquid AHSS (Fe-Mn-Al-Si), the interfacial reaction rate was approximately one third of the rate for pure liquid iron, at the same temperature, with a corresponding activation energy of 160.5 kJ/mol.

中文翻译：

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氮在 Fe-Mn 合金和先进高强度钢上的界面反应速率常数的同位素交换测量

生产第三代高级高强度钢 (AHSS) 需要精确控制溶解氮。与有据可查的热力学数据相比，这些钢中氮溶解动力学的数据是有限的。应用同位素交换技术（15N-14N 交换反应）测量纯铁水、含不同锰含量的铁水和铁-锰-铝-硅钢在不同温度下的氮反应速率。一代 AHSS 组成。界面反应速率随温度升高而增加，对应于纯铁的活化能为 144.2 kJ/mol。对于Fe-Mn合金，界面反应速率随着温度的升高和锰含量的增加而增加。对于液态 AHSS (Fe-Mn-Al-Si)，