Challenges in the formability of the next generation of automotive steel sheets

ABSTRACT

Improving strength may lightweight car bodies by thinning the structure gauge while bearing the same crash loads. Development of the third generation advanced high-strength steels aiming to boost material ductility to over 30% total elongation has become the common sense of potential solutions for stamping. Not only total elongation but also several other parameters, involving presswork hardening, anisotropy ratio, strain rate sensitivity, uniform elongation, edge sensitivity and internal stress between phases, are critical in determining the formability under the complex stress and strain distributions during stamping. We clarify here the logic of formability and difficulties in this context of three types of steel: quenching and partitioning, δ-transformation-induced plasticity and medium Mn-TRIP.

KEYWORDS:

• Lightweight
• car body
• stamping

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

H. L. Yi  http://orcid.org/0000-0002-2853-2848

Additional information

Funding

The research was financially supported by the National Natural Science Foundation of China [grant number U1560204], [grant number 51722402].