加磷高强IF钢的最优冷轧压下率确定

为了确定加磷高强IF钢的最优冷轧压下率,以工业生产的加磷高强IF钢热轧钢板为试验材料,在实验室进行了冷轧试验和盐浴退火试验,研究了冷轧压下率对试验钢显微组织和力学性能的影响。结果表明：在试验条件下,试验钢冷轧压下率为50%～80%,退火温度为820～850℃时,再结晶完成;随着冷轧压下率的增加,晶粒变得细小均匀;冷轧压下率为50%～80%,退火温度为850℃时,屈服强度为160 MPa左右,抗拉强度为345 MPa左右,延伸率为35.0%左右,塑性应变比r值和应变硬化指数n值都较高,r值为1.5左右,n值为0.30左右。最终确定工业生产中最优冷轧压下率为60%～70%。

Determination of Optimal Cold Reduction Ratio of Adding P High Strength IF Steel

In order to determine the optimal cold reduction ratio of adding P high strength IF steel,hot rolled adding P high strength IF steel sheet was used to study the effect of cold reduction ratio on the microstructures and mechanical properties by means of cold rolling test and salt-bath annealing test in the laboratory.The experimental results showed that the recrystallization had finished after cold rolling followed cold reduction ratio 50% to 80%,and annealing temperature from 820 ℃ to 850 ℃ under experimental condition.When the cold reduction ratio was increased,the grain changed fine and uniform.The yield strength,tensile strength and elongation percentage were approximately 160 MPa,345 MPa and 35.0% respetively,the plastic strain ratio r value and the strain hardening exponent n value reached larger value respectively,the r value was approximately 1.5,the n value was approximately 0.30 in which condition cold reduction ratio was 50% to 80% and annealing temperature was 850 ℃.The optimal cold reduction ratio was 60% to 70%.