|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Ultrafine-grained and Heterostructured Materials (UFGH XII)
||Energy Absorption Performance of Functionally Graded High Strength Steel
||Adam Tyedmers, Hatem Zurob, Bosco Yu, Moisei Bruhis
|On-Site Speaker (Planned)
The effect of a carbon gradient on the energy absorption of martensitic 300M sheet steel is studied. Controlled decarburization and thermomechanical processing were used to create six different microstructures, two of these were as-quenched martensitic steels with homogenous compositions 0.4 and 0.1 wt.% C, respectively. A third material was partially decarburized resulting in martensite with a carbon gradient varying from 0.1 and 0.4 wt.% at the surface and core, respectively. This material was processed further to produce three additional microstructures: tempered martensite, ultra-fine-grained ferrite/cementite mixture and ultra-fine-grained dual-phase microstructure. Pseudo-Cotterell tests with digital image correlation were used to evaluate the essential work of fracture and plastic zone sizes, while Charpy tests were performed to measure impact energies. Results show the graded materials absorb at least as much energy as the 0.1 wt.% material, while achieving a higher strength. The reported performance is superior to traditional energy absorption vs. strength correlations.
||Iron and Steel, Mechanical Properties, Surface Modification and Coatings