|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Environmentally Assisted Cracking: Theory and Practice
||In-situ SEM Investigation of Chemo-mechanical Effects on Cutting-induced Mixed-mode II-III fracture of Martensitic Stainless Steel
||Gianluca Roscioli, Cemal Cem Tasan
|On-Site Speaker (Planned)
Sharp edges are honed from carbide-rich martensitic stainless steel and applied coatings to achieve high hardness and wear resistance. Yet they fail due to the combined chemo-mechanical actions of the environment and the mixed mode II-III stress during cutting. To investigate this process, we exposed sharp edges to increasing corrosion severity and carried out in-situ electron microscopy cutting experiments with two micro-mechanical testing setups. At low corrosion levels, surface byproducts are removed during cutting, and cracks propagate at an angle with respect to the sharp edge to form a chip. As corrosion severity increases, a percolated void structure develops and cracks propagate perpendicularly to the sharp edge, with portions of the material bending out-of-plane. Although increasing corrosion severity increases the cutting force, our numerical investigation reveals that the formation of the percolated porous structure, which increases substructural heterogeneity in the material, is responsible for the change in failure mechanism.
||Environmental Effects, Iron and Steel, Modeling and Simulation