Fe-6.5%Si合金温轧后退火过程中再结晶行为

用电子背散射技术观察了700℃温轧板在退火过程中的组织及织构演变以了解其再结晶行为.结果表明，温轧织构由强的（111）〈112〉、较弱的〈110〉∥RD及Goss组成，再结晶织构与之相似.〈110〉∥RD及（111）〈112〉新晶粒首先形成于与之构成小角度晶界的形变晶粒的晶界附近，而在角隅及组织不均匀区等位置孕育出与周围晶粒构成大角度晶界的晶核，择优取向不明显.退火过程中（111）〈112〉在形变组织中累积，最终转化为（111）〈112〉再结晶晶粒.分析认为，温轧后退火是不均匀组织在低储存能驱动下的再结晶过程.（112）〈110〉及（111）〈112〉形变拉长晶粒多发生连续再结晶从而退火织构与形变态相似.在角隅区形成核心进而发生不连续再结晶，核心取向的统计性及不连续晶核的长大弱化再结晶织构，其中Goss晶粒多以此方式形成于（111）〈112〉晶粒内部.

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

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.