锻压技术

超高强双相钢扩孔性能试验研究

英文标题：Experimental study on hole expansion performance for ultra-high strength dual-phase steelrimental study on hole expansion performance for ultra-high strength dual-phase steel

作者：韩龙帅叶盛薇郑学斌韩赟陈洪生

单位：1.首钢集团有限公司技术研究院用户技术研究所 2.神龙汽车有限公司技术中心 3.首钢京唐钢铁联合有限责任公司

关键词：超高强双相钢扩孔率边部毛刺延时扩孔扩孔速率二次扩孔

分类号：TG394

出版年,卷(期):页码：2020,45(11):187-192

摘要：

为充分认识超高强双相钢DP1180的抵抗边部开裂能力，从而更好地服务技术人员设计汽车零部件结构及成形工艺，基于标准扩孔试验，研究了落料后边部毛刺、二次扩孔、扩张速率、冲孔后静置时间、扩孔后静置时间等因素对超高强双相钢DP1180扩孔性能的影响。研究结果表明：落料后断面毛刺的大小对扩孔率影响较大，视觉可见的毛刺均会使材料扩孔率降低约50%。标准要求范围内，扩孔率随着扩孔速率的提高而增加，而随着预扩孔量的提高而降低。冲孔试样延迟扩孔试验显示，推迟扩孔后扩孔率有降低的趋势，但降幅不大。扩孔静置试验表明，在最高70%的扩孔率变形下，超高强双相钢DP1180无延迟断裂现象发生。

In order to fully understand the ability of resisting edge cracking for ultra-high strength dual-phase steel DP1180 and better service technicians to design the structure and forming process of automobile parts，based on the standard hole expansion test, the influences of edge burrs after blanking, secondary hole expansion, hole expansion speed, holding time after punching and holding time after hole expansion on the hole expansion performance of ultra-high strength dual-phase steel DP1180 ware studied. The research results show that the size of burr on the section after blanking has a greater impact on the hole expansion rate, and the visible burrs reduce the hole expansion rate of material by about 50%. However, within the scope of standard requirements, the hole expansion rate increases with the increasing of hole expansion speed and decreases with the increasing of pre-formed amount of hole expansion. Furthermore, the delayed hole expansion test of punched samples shows that the hole expansion rate tends to decrease after hole expansion is delayed, but the magnitude is not large. In addition, the hole expansion static test shows that the ultra-high strength dual-phase steel DP1180 has no delayed fracture phenomenon under the deformation with the maximum hole expansion rate of 70%.

基金项目：

韩龙帅（1988-），男，硕士，工程师 E-mail：hanlongshuai@shougang.com.cn

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