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对低碳带钢进行多道次常规冷轧(原始厚度为2.5 mm,轧后厚度为0.4 mm,总压下量为84%),研究退火工艺对冷轧板组织和性能影响。结果表明:轧制完成后,晶粒明显拉长,出现了较高密度的位错。随退火温度升高,位错密度显著下降,晶粒得到细化,550℃时,形变组织完全消失,再结晶过程结束,位错密度为1.34×1014m~(-2),晶粒尺寸1.24μm。退火温度高于550℃时,晶粒尺寸不断长大,试样的表面活化能高达278 k J/mol。550℃最佳退火温度下,保温时间达到60 min时,再结晶基本完成,显微硬度下降明显,伸长率增加。
The low-carbon strip was cold-rolled by multiple passes (initial thickness 2.5 mm, thickness 0.4 mm after rolling and total reduction 84%). The effects of annealing process on microstructure and properties of cold-rolled sheet were studied. The results show that after the completion of rolling, the grains are obviously elongated and higher density dislocations appear. With the increase of annealing temperature, the dislocation density decreased significantly and the grains were refined. At 550 ℃, the deformed structure completely disappeared and the recrystallization process was completed. The dislocation density was 1.34 × 1014m -2 and the grain size was 1.24μm . When the annealing temperature is higher than 550 ℃, the grain size keeps growing, and the surface activation energy of the sample can reach as high as 278 kJ / mol. Under the optimal annealing temperature of 550 ℃, the recrystallization is basically completed when the holding time reaches 60 min, the microhardness decreases obviously and the elongation increases.