Transactions of Materials and Heat Treatment

Title：Influence of pre-deformation on edge deformability for advanced high strength steel

Authors：

Unit：

KeyWords： advanced high strength steel pre-deformation edge deformability hole expansion flanging

ClassificationCode：TG386.2

year,vol(issue):pagenumber：2021,46(6):112-116

Abstract：

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.

Funds：

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

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