|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Deformation Induced Microstructural Modification
||Utilizing severe plastic deformation to increase resistance to mixed-mode cracking in sharp edges
||Gianluca Roscioli, Cemal Cem Tasan
|On-Site Speaker (Planned)
To reduce costs while obtaining high hardness and wear resistance, typical materials used in sharp edges are carbide-rich martensitic stainless steels. Since the characteristic feature size of their microstructure is larger than the tip radius, the spatial heterogeneity present along the sharp edge results in a mixed mode II/III cracking. To improve upon these materials, we designed a process to locally produce massively solid solutioned ultrafine ferritic grains through plastic deformation. The high strength obtained is enough to bear compressive and bending loads, meanwhile the microstructural gradient produced from the tip to the bulk of the blade creates a tougher material than full martensite. This material has been characterized through electron backscattered diffraction images and picoindentation tests. In addition, a sharp edge produced with this material has been tested in in-situ SEM shearing experiments to show the improved mechanical response with respect to the currently used martensitic stainless steels.
||Iron and Steel, Mechanical Properties, Shaping and Forming