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采用冷轧技术对带钢进行了多道次常规冷轧,试件原始厚度为2.5mm,轧后厚度为0.4mm,总压下量为84%。然后对试件进行了不同温度和不同保温时间的退火,进行了显微组织观察,并进行硬度试验和拉伸试验。结果表明:冷轧退火后的带钢力学性能和微观组织与退火工艺有关。轧制后,晶粒明显拉长,出现了新的晶粒;退火过程中,随着退火温度增加,平均晶粒尺寸减小,且观察到了较小尺寸的亚晶;而带钢的强度和硬度不断下降,塑性和韧性得到改善。最佳退火温度为550℃,最佳保温时间为1 h。
The strip was cold rolled by conventional cold rolling technology. The original thickness of the strip was 2.5mm, the thickness after rolling was 0.4mm and the total reduction was 84%. Then the specimens were annealed at different temperatures and different holding time, the microstructure was observed, and the hardness test and tensile test were carried out. The results show that the mechanical properties and microstructure of the strip after cold rolling are related to the annealing process. After rolling, the grains are obviously elongated and new grains appear. During the annealing process, the average grain size decreases and the smaller size subgrains are observed as the annealing temperature increases; while the strength of the strip and Hardness declines, plasticity and toughness are improved. The best annealing temperature is 550 ℃, the best holding time is 1 h.