锻压技术

预变形对先进高强钢边部变形能力的影响

英文标题：Influence of pre-deformation on edge deformability for advanced high strength steel

作者：李涛周慧春刘宇刘辉刘洋

分类号：TG386.2

出版年,卷(期):页码：2021,46(6):112-116

摘要：

汽车板冲压成形过程中，高强钢的翻边、扩孔等边部变形多数在拉延变形工序后进行，以原板的扩孔率来评价材料的边部变形能力往往误差较大。基于此，选取了两种成分体系的先进高强钢HC420/780DP，利用单轴预拉伸及预拉伸后的标准扩孔试验，研究了预变形对先进高强钢HC420/780DP的边部变形能力的影响及其变化规律。研究结果表明：沿着轧向和垂直于轧向的预变形中，边部裂纹扩展的方向均与预变形的方向一致；随着预变形量的增加，先进高强钢HC420/780DP的边部变形能力降低，且CSiMn成分体系的先进高强钢HC420/780DP的边部变形能力降低得更为明显；当预变形量相同时，随着板材厚度的增加，先进高强钢HC420/780DP的边部变形能力整体呈下降趋势。

In the stamping process of automobile sheet, the edge deformation of high-strength steel, such as flanging and hole expansion, is mostly carried out after the drawing process, and the evaluation of the edge deformability of materials based on the hole expansion ratio of the original plate is often of great error. Based on this, for two kinds of HC420/780DP advanced high strength steels with two kinds of component systems, the influences of pre-deformation on the edge deformability for HC420/780DP advanced high strength steel and its change laws were studied respectively by uniaxial pre-stretching and standard hole expanding test after pre-stretching. The results show that the direction of edge crack propagation is consistent with the direction of pre-deformation in the pre-deformation along the rolling direction and perpendicular to the rolling direction. With the increasing of pre-deformation amounts, the edge deformability of advanced high strength steel HC420/780DP decreases, and the edge deformability of HC420/780DP advanced high strength steel for C-Si-Mn component system decreases more obviously. Furthermore, when the pre-deformation amount is the same, the edge deformability of HC420/780DP advanced high strength steel decreases with the increasing of sheet thickness.

基金项目：

李涛（1977-），男，博士，高工 E-mail：13832509476@163.com

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