Abstract The microstructure evolution, transformation kinetics and especially the C enrichment during isothermal ferrite transformation at 800, 750, 700 °C for Fe-(1.5, 3.0) mass%Si-0.4mass%C alloys were investigated in the present study. Both transformation kinetics and C enrichment in austenite (γ) at grain boundary ferrite (GBF)/γ interfaces suggest that negligible partitioning local equilibrium (NPLE) mode operates during non-partitioned ferrite growth under the conditions investigated. Deviations of C enrichment in γ at Widmanstatten ferrite (WF)/γ interfaces from NPLE limit at early stages were observed. These deviations are deduced to be resulted from intrinsic interface mobility rather than solute drag effect. In addition, mobility of WF/γ interfaces is found to be lower than that for incoherent GBF/γ interfaces reported in literature.

中文翻译：

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Fe-Si-C合金中铁素体转变过程中的碳富集

摘要 本研究研究了 Fe-(1.5, 3.0) mass%Si-0.4mass%C 合金在 800、750、700 °C 等温铁素体相变过程中的微观结构演变、相变动力学，尤其是 C 富集。晶界铁素体 (GBF)/γ 界面处奥氏体 (γ) 中的相变动力学和 C 富集表明，在所研究的条件下，在非分区铁素体生长期间，可忽略的分区局部平衡 (NPLE) 模式运行。观察到 Widmanstatten 铁氧体 (WF)/γ 界面处 γ 中 C 富集与早期 NPLE 极限的偏差。这些偏差被推断是由内在界面迁移率而不是溶质拖曳效应引起的。此外，发现 WF/γ 界面的迁移率低于文献中报道的非相干 GBF/γ 界面的迁移率。