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采用阶梯形异径轧辊,对带钢同时进行3种异径比的多道次异步冷轧,在压下率80%时,对轧件进行微观显微组织观察,并进行拉伸试验和不同温度的退火试验。结果表明:随着异径比增加,晶粒长度和宽度的比值增大,抗拉强度增加,退火后晶粒平均直径变小;随着异径比增加,观察到了较高位错密度的位错和较小尺寸的亚晶;验证了异步轧制与同步轧制相比变形更加剧烈,可以产生更多的位错和亚晶、提高带钢的强度、增加应变储能、降低再结晶退火温度。
The use of trapezoidal-shaped roll diameter of the strip at the same time three different diameter of the multi-pass asynchronous cold rolling, the reduction rate of 80%, the rolling microstructure observation, and the tensile test and different Temperature annealing test. The results show that as the diameter ratio increases, the ratio of grain length to width increases, the tensile strength increases and the average grain diameter decreases after annealing. Dislocations with higher dislocation density are observed as the diameter ratio increases And smaller size subgrains. It is verified that asynchronized rolling is more deformable than synchronous rolling, more dislocations and subgrains can be produced, the strength of the strip can be increased, the strain energy storage can be increased and the recrystallization annealing temperature can be lowered .