高强IF钢的最优热轧卷取温度和冷轧压下率确定.pdfVIP

高强 IF 钢的最优热轧卷取温度和冷轧压下率确定 王敏莉 郑之旺 张功庭 （攀钢集团研究院有限公司，成都 611731 ） 摘 要 本文以工业生产的高强 IF 钢为试验材料，在实验室研究了卷取温度和冷轧压下率对试验钢显微组织、力 学性能和织构的影响。结果表明：在试验条件下，试验钢在不同冷轧压下率下，卷取温度 550℃到 600℃时，再结 晶完成；不同卷取温度下，随着冷轧压下率的增加，晶粒变得细小均匀；卷取温度600℃时、不同的冷轧压下率下， 屈服强度、抗拉强度、伸长率分别在 160MPa、345MPa、35.0%左右，塑性应变比 r 和应变硬化指数 n 都具有较高 值，r 为 1.5 左右，n 为 0.30 左右； 随着卷取温度的提高，{111}110织构密度逐渐增强。最终提出工业生产中卷 取温度 600℃，冷轧压下率60%～70%，可以获得高强度和优良的成型性能。 关键词 高强 IF 钢 卷取温度 冷轧压下率 织构 Determinition of Optimal Coiling Temperature and Cold Reduction Ratio of High Strength IF Steel Wang Minli Zheng Zhiwang Zhang Gongting ( PanGang group Research Institute Co., Ltd., Chengdu, 611731) Abstract Hot rolled high strength IF steel sheet was used to study the effect of coiling temperature and cold reduction ratio on the microstructures, mechanical properties and textures of experimental steel. The experimental results showed that the recrystallization has finished after cold rolling followed different cold reduction ratio and coiling temperature was from 550 ℃ to 600 ℃ under experimental condition. When the cold reduction ratio was increased, the grain changed fine and uniformity under different coiling temperature; The yield strength, tensile strength and elongation percentage were approximate 160 MPa, 345 MPa and 35.0 % respectively, under coiling temperature 600 ℃ and different cold reduction ratio condition, the plastic strain ratio r value and the strain hardening exponent n value were reached the maximum, respectively, the r value was approximate 1.5, the n value was approximate 0.30. When the coiling temperature was increased, the {111}110 texture of α skeleton lines was stronger. Therefore, the su