|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Advanced High Strength Steels IV
||Increased Damage in Dual Phase Steels under Dynamic Strain Aging Conditions
||Merve Cobanoglu, Rasim Koksal Ertan, Caner Simsir, Mert Efe
|On-Site Speaker (Planned)
Damage formation in dual phase steels is a complex process and it may be sensitive to the deformation conditions and mechanisms. In this study, the damage parameter is measured and compared under quasi-static and industrial deformation conditions (temperatures: 25 vs 200°C and strain rates: 10-3 vs 10/s) for DP590 and DP800 steels. Scanning electron microscopy, resonance frequency and damping analyzer, and ultrasonic sound velocity measurement techniques are utilized for the measurements to compare the effectiveness and validity of each technique. At a given strain, the damage values can be up to 250% higher at industrial forming conditions, under which dynamic strain aging (DSA) controls the deformation behavior. DSA results in lower formability and is the likely mechanism responsible from the abnormal damage evolution. Moreover, DSA and damage evolution are both exacerbated in DP590, highlighting the importance of microstructure, and especially ferrite content, for the deformation behavior.
||Planned: Supplemental Proceedings volume