三种强度级别的双相钢成形性能研究

摘要

对三种不同强度级别、不同厚度的双相钢进行了系统的成形性试验，综合分析了双向钢的力学性能、杯突性能、冷弯性能、成形极限。研究表明：双向钢的延伸率A及加工硬化指数n值随强度级别上升而下降；杯突试验结果表明，杯突的高度随双相钢强度级别上升而下降，随材料厚度升高而升高；双相钢冷弯性能随材料强度级别上升而下降；双轴应变下的胀形试验表明双向钢具有良好的成形性；基于软钢的FLD0（是指成形极限曲线FLC与纵坐标e1的交点的纵坐标值，它是FLD（成形极限图）上的重要的特征点）经验公式并不能直接套用在双向钢上。%For three different strength level , different thicknesses were systematically formability test,Comprehensive analysis of the mechanical properties of (dual-phase)DP steel,cupping performance,cold bending,forming limit. Studies show that:Elongation and the value of n for DP steel decreases with rising intensity level. Cupping test results show that the height of the cupping with the DP steels up strength level decreases ,and increases with increasing thickness of the material. Duplex steel cold bending properties with increased material strength level decreases. Bulging under biaxial strain tests showed that DP steel has good formability. Based on mild steel FLD0 empirical formula can’t be directly applied to the DP steel.