Abstract The remarkably abnormal growth behavior of columnar grains and the formation of Σ3 grain boundaries (GBs) were studied via plastic deformation and annealing based on an electron backscattering diffraction (EBSD) investigation. Driven by the stored energy and GB mobility, coarse austenite columnar grains were formed by the abnormal growth of fine equiaxed grains with higher grain orientation spread (GOS) values in the reducing atmosphere of hydrogen. Moreover, extraordinarily coarse columnar grains with high GOS values and non-{1 1 1} texture were formed by microstructure inheritance during γ → α transformation. In addition, slender ferritic columnar or island grains with Σ3 GBs and low GOS values were generally obtained, and the formation mechanism was strictly associated with the Kurdjumov-Sachs (K-S) relationship, which was induced during variant selection driven by the GB mobility and surface effect in the reducing atmosphere of hydrogen.

中文翻译：

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无取向电工钢柱状晶粒异常生长及Σ3晶界形成

摘要 基于电子背散射衍射 (EBSD) 研究，通过塑性变形和退火，研究了柱状晶粒的显着异常生长行为和 Σ3 晶界 (GBs) 的形成。在储存能量和 GB 迁移率的驱动下，在氢的还原气氛中，具有较高晶粒取向扩展 (GOS) 值的细等轴晶粒的异常生长形成了粗大的奥氏体柱状晶粒。此外，在γ→α转变过程中通过微观结构继承形成了具有高GOS值和非{1 1 1}织构的异常粗大的柱状晶粒。此外，普遍获得了具有Σ3 GBs和低GOS值的细长铁素体柱状或岛状晶粒，其形成机制与Kurdjumov-Sachs（KS）关系密切相关，