Transactions of Materials and Heat Treatment

Title：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

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ClassificationCode：TG394

year,vol(issue):pagenumber：2020,45(11):187-192

Abstract：

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%.

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

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