In this study, a set of thermodynamic, kinetic, and microstructure data is presented to simulate the non-equilibrium solidification of Fe-Al-Mn-Si-C alloys. The data were further validated with the experimental measurements and then used in a thermodynamic–kinetic software, IDS, to establish the effect of the alloying and cooling rate on the solidification behavior of high-AlMnSi (Al ≥ 0.5 wt pct, Mn ≥ 2 wt pct, Si ≥ 1 wt pct) steels. The modeling results were additionally validated by conducting electron probe microanalysis (EPMA) measurements. The results reveal that (1) solidification in high-AlMnSi steels occurs at much lower temperatures than in carbon steels; (2) increasing the cooling rate marginally lowers the solidus; (3) the microsegregation of Mn in austenite is much stronger than that of Si and Al due to the tendency of Al and Si to deplete from the liquid phase; (4) the residual delta ferrite content may be influenced by a proper heat treatment but not to the extent that could be expected solely from thermodynamic calculations; (5) in high-AlMnSi steels containing less than 0.2 wt pct carbon, the cracking tendency related to the strengthening above the solidus and the shell growth below the solidus may be much lower than in carbon steels.

中文翻译：

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用于模拟 Fe-Al-Mn-Si-C 合金凝固的热力学、动力学和显微结构数据

在这项研究中，提供了一组热力学、动力学和微观结构数据来模拟 Fe-Al-Mn-Si-C 合金的非平衡凝固。数据通过实验测量进一步验证，然后用于热力学-动力学软件 IDS，以确定合金化和冷却速率对高 AlMnSi（Al ≥ 0.5 wt pct，Mn ≥ 2 wt pct，Mn ≥ 2 wt pct）凝固行为的影响pct, Si ≥ 1 wt pct) 钢。通过进行电子探针微量分析 (EPMA) 测量进一步验证了建模结果。结果表明：（1）高AlMnSi钢的凝固温度远低于碳钢；(2) 增加冷却速度略微降低固相线；(3)由于Al和Si从液相中耗尽的趋势，Mn在奥氏体中的显微偏析比Si和Al的显微偏析强得多；(4) 残余 delta 铁素体含量可能会受到适当热处理的影响，但不会影响到仅通过热力学计算可以预期的程度；(5) 在碳含量低于 0.2 wt pct 的高 AlMnSi 钢中，与固相线上方的强化和固相线下方的壳生长相关的开裂趋势可能比碳钢低得多。