Deformation and recrystallization texture and microstructure evolution of thin grain-oriented silicon steel sheets
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摘要: 利用背散射電子衍射微織構分析技術及X射線衍射織構分析技術,結合對取向硅鋼薄帶再結晶各階段退火板磁性能的分析,系統研究了其形變再結晶過程中的組織及織構演變.結果表明,薄帶內原始高斯晶粒取向發生繞TD軸向{111}〈112〉的轉變,同時晶粒取向還表現出繞RD軸的附加轉動,這種附加轉動及其導致的表層微弱立方形變組織可為再結晶立方織構的形成提供核心.退火各階段樣品磁性能的變化對應了{110}-{100}〈001〉有益織構及其他織構的強弱轉變以及再結晶晶粒不均勻程度的變化,綜合織構類型及晶粒尺寸的變化推斷發生了二次及三次再結晶過程.升溫過程再結晶織構演變主要體現了織構誘發機制,也即與基體存在繞〈001〉軸取向關系的晶粒長大優勢結合高斯織構的抑制效應發揮作用;而在高溫長時間保溫后三次再結晶過程,{110}低表面能誘發異常長大發揮主要作用使得最終得到鋒銳的高斯織構.Abstract: Combined with magnetic property measurements of thin grain-oriented silicon steel sheets annealed to different recrys-tallization stages, the deformation and recrystallization texture and microstructure evolution of the sheets was analyzed by using the electron back-scattering diffraction (EBSD) micro-texture analysis technique and X-ray diffraction texture analysis technique. The results show that the deformation texture transforms from {110}{001}to {111}{112} about the transverse direction. Meanwhile, it should be noticed that additional crystal rotation about RD which leads to the occurrence of a weak{001}{100} texture near the sheet surface appears in deformed grains, thus the origin of a cube recrystallization texture can be explained. As the annealing temperature increases, there occur abnormal grain growth and changes in magnetic properties, which are bound up with texture evolution including a beneficial {110} -{100}{001} texture and other weak texture components. Taking both abnormal grain growth and texture evolution into consideration, it is deduced that secondary and tertiary recrystallization occur. There exists crystallographic rotation about the{001} axis between different kinds of textural components at different recrystallization stages, so the recrystallization texture evolution of the sheets is believed to be driven by the growth dominance of grains having {100} rotational relationship with primary grains and the inhibition effect of the sharp Goss matrix. On the other hand, the abnormal growth of Goss grains induced by the strong advantage of {110} surface energy leads to a sharp Goss texture during tertiary recrystallization after annealing at high temperature for long time.
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Key words:
- silicon steel /
- sheets /
- textures /
- deformation /
- recrystallization
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