|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||High Performance Steels
||Custom Designed Tapered-rolling Process Enables Hard Steels with Mixed-mode Cracking Resistance
||Gianluca Roscioli, Cemal Cem Tasan
|On-Site Speaker (Planned)
Carbide-rich martensitic stainless steels are typically used for sharp edges to obtain high hardness and wear resistance while reducing costs. However, the characteristic size of the microstructural constituents is larger than the tip radius, leading to spatial heterogeneity in mechanical properties along the edge and, in turn, to mixed mode II/III cracking. To improve these materials, we designed a new manufacturing process that uses tapered rolls to locally promote solid-solutioning of ultrafine ferritic grains through plastic deformation. This process leads to a gradient-induced toughening effect and high strength near the sharp edge, sufficient to avoid cracking due to the compressive and bending loads. We characterized this graded material through electron backscattered diffraction and Picoindentation hardness tests. In addition, a sharp edge produced with this material was tested in in-situ SEM cutting experiments to show the improved mechanical response.
||Iron and Steel, Shaping and Forming, Mechanical Properties