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Fe-6.5%Si合金溫軋后退火過程中再結晶行為

Recrystallization behavior of warm rolled Fe-6.5%Si alloy sheet

  • 摘要: 用電子背散射技術觀察了700℃溫軋板在退火過程中的組織及織構演變以了解其再結晶行為.結果表明,溫軋織構由強的(111)〈112〉、較弱的〈110〉∥RD及Goss組成,再結晶織構與之相似.〈110〉∥RD及(111)〈112〉新晶粒首先形成于與之構成小角度晶界的形變晶粒的晶界附近,而在角隅及組織不均勻區等位置孕育出與周圍晶粒構成大角度晶界的晶核,擇優取向不明顯.退火過程中(111)〈112〉在形變組織中累積,最終轉化為(111)〈112〉再結晶晶粒.分析認為,溫軋后退火是不均勻組織在低儲存能驅動下的再結晶過程.(112)〈110〉及(111)〈112〉形變拉長晶粒多發生連續再結晶從而退火織構與形變態相似.在角隅區形成核心進而發生不連續再結晶,核心取向的統計性及不連續晶核的長大弱化再結晶織構,其中Goss晶粒多以此方式形成于(111)〈112〉晶粒內部.

     

    Abstract: Microstructure and texture evolution in warm rolled Fe-6.5% Si alloy sheet were observed in the process of annealing treatment by means of electron backscatter diffraction,and the recrystallization behavior was discussed. The results show that the texture of the warm rolled and annealed sheet is composed of strong(111) 〈112〉,weak 〈110〉//RD and Goss. 〈110〉//RD and(111) 〈112〉recrystallized grains prior nucleate at the vicinity of grain boundaries of deformed grains possessing analogous orientation,thus low angle grain boundaries appear between recrystallized and deformed grains. New grains with statistic orientation and nucleated at sharp corners and places characterized by inhomogeneous microstructure form high angle grain boundaries with the surrounding matrix. Finally,(111) 〈112〉grains accumulated in the deformed matrix develop into(111) 〈112〉new grains,and the recrystallized(111) 〈112〉texture is strengthened. It is concluded that the annealing of the warm rolled sheet is characterized by low storage energy drive and inhomogeneous microstructure.(111) 〈112〉and(112) 〈110〉 deformed grains develop into new grains by continuous recrystallization. New grains formed in sharp corners are gained by discontinuous recrystallization,and their statistic orientation and high migration rate of high angle grain boundaries lead to a weakened texture level of recrystallization microstructure. In addition,Goss grains major nucleate in(111) 〈112〉deformed grains.

     

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