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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Material Behavior Characterization via Multi-Directional Deformation of Sheet Metal
Presentation Title Experimental Studies into the Role of Cyclic Bending during Stretching of Dual-phase Steel Sheets
Author(s) Marko Knezevic, Camille M Poulin
On-Site Speaker (Planned) Marko Knezevic
Abstract Scope Continuous-bending-under-tension (CBT) has been conceived as a mechanical test or a forming process imparting cyclic bending during stretching of a metallic sheet or strip in order to increase its elongation to fracture (ETF) relative to simple tension (ST). This paper evaluates the behavior in CBT of four dual-phase (DP) automotive advanced high strength steels, DP 590, DP 780, DP 980, and DP 1180. In doing so, the process parameter space defined in terms of crosshead velocity applying the tensile force, and roller depth imposing the amount of bending to the specimen has been explored to maximize the ETF of these materials. The optimal parameters improve ETF of the materials over five times. Microstructural characterization of the materials revealed high integrity of the sheets deformed to large plastic strains under CBT due to a favorable distribution of deformation as opposed to localized flow followed by necking and fracture in ST.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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