Local formability of medium-Mn steel

Fuhui Shen*, Hesong Wang, Zhongjian Liu, Wenqi Liu, Markus Könemann, Guo Yuan, Guodong Wang, Sebastian Münstermann, Junhe Lian

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)


Global formability and local formability are critical in different metal forming processes. Edge cracking, controlled by the local formability, is a dominant factor limiting the application of advanced high strength steels (AHSS) in automotive industries. The local formability of a medium-Mn steel (MMnS), a promising candidate of the third generation of AHSS, is evaluated based on forming limit curves at fracture and compared with a dual-phase DP1000 steel using the damage mechanics approach. The superior tensile properties of the investigated MMnS, high tensile strength, pronounced strain hardening, large uniform and total elongation, lead to a very good global formability, which is an indicator of necking resistance. However, the local formability of the investigated MMnS, which is an indicator of fracture resistance and quantified by the plastic strain at fracture under different stress states, is worse than the DP1000 steel. By comparing the local and global formability of the two AHSS, it is confirmed that ductile fracture is the dominant failure mode in the MMnS and the onset of localized necking occurs prior to ductile fracture in the DP1000 steel. To achieve an accurate determination of the local formability, the effects of stress states need to be considered, which cannot be derived explicitly from uniaxial tensile tests. In addition to tensile properties, more attention should be paid to the local formability of new AHSS to assess their potential application in automotive industries.

Original languageEnglish
Article number117368
Number of pages10
JournalJournal of Materials Processing Technology
Early online date8 Sept 2021
Publication statusPublished - Jan 2022
MoE publication typeA1 Journal article-refereed


  • Damage mechanics
  • Forming limits
  • Global formability
  • Local formability
  • Medium-Mn steel


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