Abstract

Penetrating morphologies at the growth front of abnormally-growing Goss grains in Fe–3%Si steel was examined in view of the possibility that they are the two-dimensional section of the solid-state wetting (SSW) along the triple junction line. To obtain the statistically meaningful data, 102 penetrated grain and 204 penetrating abnormally-growing Goss grain morphologies were examined. The misorientation angles of penetrating and penetrated grains were measured by electron backscattered diffraction. Among the 102 examined penetrated grain boundaries, none has low misorientation angles less than 15°, whereas 17.2% of the 204 penetrating grain boundaries have low misorientation angles, and 23.5% of them have coincidence site lattice boundaries. Besides, boundary energies of penetrating Goss grains, which were estimated from misorientation angles of the three grains in the penetrating morphology, satisfied the energetic condition for SSW along the triple junction line. These results imply that the abnormal grain growth of Goss grains in Fe–3%Si steel occurs by the mechanism of sub-boundary enhanced SSW.

Graphic Abstract

中文翻译：

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Fe-3％Si钢中异常生长的高斯晶粒生长前的取向错误特征

摘要

考虑到Fe-3％Si钢中异常生长的高斯晶粒生长前沿的渗透形态，可能是沿着三结线的固态润湿（SSW）的二维截面。为了获得具有统计意义的数据，检查了102个穿透晶粒和204个穿透异常生长的高斯晶粒形态。通过电子反向散射衍射测量穿透和穿透的晶粒的取向差角。在检查的102个穿透的晶界中，没有一个具有小于15°的低取向差角，而204个穿透晶界中的17.2％具有低取向差角，而23.5％的具有重合位点晶界。此外，穿透高斯晶粒的边界能 从穿透形态中的三个晶粒的取向差角度来估计，它们满足了沿着三重结线的SSW的能量条件。这些结果表明，Fe–3％Si钢中高斯晶粒的异常晶粒长大是通过亚边界强化SSW的机理发生的。

图形摘要