Reversible phase transformation in polycrystalline TRIP steels induced by cyclic indentation performed at the nanometric length scale
Metastable austenitic stainless steels are an interesting group of materials, which exhibit the Transformation Induced Plasticity effect. In this regard, phase transformation from austenite to martensite enhances the work hardening of the metastable austenitic stainless steels affecting the deformat...
| Autores: | , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2018 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/125794 |
| Acceso en línea: | https://hdl.handle.net/2117/125794 https://dx.doi.org/10.1002/srin.201800234 |
| Access Level: | acceso abierto |
| Palabra clave: | Phase transformations (Statistical physics) Steel cyclic indentation metastable austenitic stainless steels nanoindentation plastic deformation mechanisms reversible phase transformation Acer Àrees temàtiques de la UPC::Enginyeria dels materials |
| Sumario: | Metastable austenitic stainless steels are an interesting group of materials, which exhibit the Transformation Induced Plasticity effect. In this regard, phase transformation from austenite to martensite enhances the work hardening of the metastable austenitic stainless steels affecting the deformation dynamics and mechanical properties including fatigue properties. Within this context, the reversible load-induced phase transformation from ¿ to ¿-martensite is investigated at the local scale under cyclic indentation. This reversible phase transformation is manifested itself by a combination of hysteresis loops, elbow formation, and reversible pop-ins in the loading curve. The initial cyclic achieved through the nanoindentation technique allows to identify three different deformation regimes for the <111> austenitic grains. Firstly, a softening effect takes place due to the dislocation activation; subsequently the phase transformation induces a hardening effect and finally, the load deformation curve reaches a plateau where no more plastic deformation is observed. |
|---|