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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.
The microstructure and texture evolution of the 700 ℃ hot-rolled sheet during annealing were observed by electron backscattering technique to understand its recrystallization behavior. The results show that the textures of the warm-rolled structure consist of strong (111) <112> and weak 110> ∥RD and Goss with similar recrystallization texture.The new grains of <110> ∥RD and (111) <112> are firstly formed near the grain boundaries of the deformed grains with which the small angle grain boundaries are formed, However, the nuclei that formed the large-angle grain boundaries with the surrounding grains in the corner and the non-uniform area of the tissues showed the preferential orientation was not obvious. (111) <112> accumulated in the deformed tissues during the annealing and finally transformed into ( 111) <112> recrystallized grains. It is suggested that annealing after warm rolling is a recrystallization process of inhomogeneous structure driven by low storage energy. (112) <110> and (111) <112> The occurrence of continuous recrystallization and annealing texture is similar to that of deformation.Core nuclei are formed in the corner area, which leads to discontinuous recrystallization, statistic of core orientation and growth-weakening recrystallization texture of discontinuous nuclei. Goss grains Mostly formed in this way inside the (111) <112> grains.