|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced High-Strength Steels
||F-5: Controlling Springback in Dual-Phase Steels
||Milan Agnani, Peter van Liempt, Jilt Sietsma, Zaloa Arechabaleta
|On-Site Speaker (Planned)
Advanced High Strength Steels (AHSS) are extremely suitable for lightweight automotive applications. AHSS forming is, however, a challenge for the car companies, which cannot predict springback –strain relaxation after release of the forming stresses- accurately. Besides the elastic part, there is an additional component of the total relaxed strain, which significantly contributes to the springback magnitude. This additional strain component is the so-called anelastic strain and is caused by limited reverse glide of dislocations during load removal. The higher the dislocation density, the larger the anelastic contribution, but adequate quantitative prediction is at the moment not feasible. Moreover, multiphase AHSS will show specific anelastic dislocation behaviour in each constituent. The present work aims to understand the dislocation behaviour in ferrite and martensite when both phases are present in different volume fractions. A physically-based model is coupled with mechanical and nano-indentation experiments to describe the dislocation behaviour, both qualitatively and quantitatively.
||Planned: Supplemental Proceedings volume