DP490双相钢车门外板应用研究

对比了DP490双相钢与常规外覆盖件用钢的材料特性差异,以某车型后车门外板为研究对象,结合仿真和试验研究了应用DP490双相钢的车门外板高强减薄后风险最大的成形性及抗凹性问题。结果表明,针对目标零件,采用DP490双相钢的成形状态良好,无开裂、起皱缺陷,虽然部分测量位置尺寸偏差超出上、下限,但满足包边要求。同时,仿真及试验均表明,外板抗凹性得到较大提升,虽然抗凹刚度下降,但满足抗凹刚度要求。因此,采用0. 65 mm厚度的DP490双相钢板制作车门外板具备可行性,可以作为未来车型选材的备选方案。

Research on DP490 dual phase steel application in door outer panel

The difference in material properties between DP490 dual phase steel and conventional steel used in outer cover parts was compared,and for the rear door outer panel of an automobile,its formability and dent resistance property which were the riskiest after the high strengthen thinning of door outer panel using DP490 dual phase steel were studied by simulation and experiments. The results show that the formability of the aimed parts using DP490 dual phase steel is good without cracking or wrinkling defects. Although the size deviation in some measurement positions exceeds the upper and lower limits,but it meets the requirement of edge bending. At the same time,the simulation and experiment results show that the dent resistance property of outer panel improves greatly,and the dent stiffness reduces,but the dent stiffness requirements is met. Thus,it is feasible to use the DP490 dual phase steel with the thickness of 0. 65 mm to produce door outer panel,which is an alternative scheme for the vehicle selection material in the future.