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对中间退火后不同冷轧变形量的板材显微组织进行了对比分析,利用电子背散射衍射(EBSD)观察了不同变形量轧制的板材纵向面的晶粒再结晶、亚晶分布情况,采用中心穿透裂纹(CCT)试样测定了疲劳裂纹扩展速率,研究了中间退火后冷轧变形量对板材的晶粒取向和耐损伤性能的影响规律。结果表明,随着中间退火后的冷轧变形量的增加,晶粒细化,且小角度晶界的数量减少;中间退火后的冷轧变形量为40%时,其力学性能最为优异,但变形量增加至50%时,其裂纹扩展速率不合格;2E12铝合金薄板中间退火后的冷轧变形量以40%为宜。
The microstructures of the plates with different cold rolling deformation after the intermediate annealing were analyzed. The grain recrystallization and subgrain distribution in the longitudinal direction of the plates with different deformations were observed by electron backscatter diffraction (EBSD) The crack growth rate (CCT) was measured and the influence of the amount of cold rolling deformation on the grain orientation and the scratch resistance of the sheet after the intermediate annealing was investigated. The results show that with the increase of cold rolling deformation after intermediate annealing, the grains are refined and the number of small-angle grain boundaries decreases. When the amount of cold rolling after intermediate annealing is 40%, the mechanical properties are the best, When the deformation is increased to 50%, the crack propagation rate is unqualified. The cold rolling deformation after 2E12 aluminum alloy sheet is annealed at 40% is appropriate.