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Effect of Silicon, Manganese and Heating Rate on the Ferrite Recrystallization Kinetics

机译：硅，锰和加热速率对铁氧体再结晶动力学的影响

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This study presents the effects of silicon (Si) and manganese (Mn) concentration and of heating rate on the ferrite recrystallization kinetics in seven model alloys with different Si and Mn concentrations, which are of relevance for the development of Advanced High Strength Steels (AHSS). The recrystallization kinetics were studied with in-situ 2D X-ray Diffraction (2D-XRD) and ex-situ microstructure observations using Scanning Electron Microscopy (SEM). The experimentally observed differences in the recrystallization start temperature (T_(s) ), dependent on the Si and Mn concentrations and the heating rate, can be described by combining the non-isothermal JMAK-model with a modified version of Cahn’s solute drag model. The modified Cahn model takes into account – in an approximate manner – that the interaction energy of the solute atoms with the grain boundary depends on the Si and Mn concentrations in the boundary and the Wagner interaction parameters. The collective contribution of the Si and Mn atoms to the increase in the T_(s) with respect to the reference alloy (without Si and with very little Mn) is higher than would be expected from the simple addition of the effects of the Si and Mn concentrations alone. This means that the interaction between Si and Mn atoms leads to an additional increase in T_(s) , i.e. a coupled solute drag effect. For the later stages of recrystallization, we have studied the change in the number density and the growth rates of the recrystallizing grains using SEM. The observations show non-random nucleation, early impingement of the grains in the normal-direction and non-constant growth rates of recrystallizing grains.
机译：该研究介绍了硅（Si）和锰（MN）浓度和七种模型合金中的七种模型合金对不同Si和Mn浓度的热速率的影响，这与高强度钢的发展有关（AHSS ）。使用扫描电子显微镜（SEM）用原位2D X射线衍射（2D-XRD）和 ex原位微观结构观察来研究重结晶动力学。通过将非等温JMAK模型与修改版的CAHN的溶质形式组合，通过将非等温jmak模型组合来描述基于Si和Mn浓度和加热速率的实验观察到的重结晶开始温度（ T_（s））的差异拖动模型。修改的CAHN模型以近似的方式考虑 - 溶质原子与晶界的相互作用能量取决于边界和瓦格纳相互作用参数的Si和Mn浓度。 Si和Mn原子对参考合金（没有Si和非常小Mn）的 T_（s）增加的集体贡献高于简单地增加效果的预期单独的Si和Mn浓度。这意味着Si和Mn原子之间的相互作用导致额外增加 T_（s），

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