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Artículo

Mechanical and microstructural behavior of a heterogeneous austenitic stainless steel processed by Equal Channel Angular Sheet Extrusion (ECASE)

Muñoz Bolaños, Jairo AlbertoIcon ; Komissarov, Alexander; Avalos, Martina CeciliaIcon ; Bolmaro, Raul EduardoIcon
Fecha de publicación: 08/2020
Editorial: Elsevier Science SA
Revista: Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing
ISSN: 0921-5093
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Ingeniería de los Materiales

Resumen

A sheet-shaped austenitic stainless steel (ASS) was processed by one ECASE pass. In this way, larger deformations were introduced close to the sheet edge vicinities, while the middle zone remained less affected by the deformation. The heterogeneous deformation produced larger amounts of deformation induced martensite (DIM) at the sheet edges, resulting in a heterogeneous structure along the sheet thickness. Tensile tests revealed that after the deformation process the material increased its yield strength more than 3 times from 200 MPa in its initial state to ~690 MPa after one ECASE pass. Tensile tests for the processed material in different zones of sheet thickness revealed the existence of two types of materials, one more resistant and less ductile (near the edges) and other more ductile, but less resistant (in the middle zone). Because of the heterogeneity, higher dislocation densities were found in the edges than in the middle of the sheet, giving rise to a plastic deformation gradient in which the region near the edge is capable of withstanding greater plastic deformations by generating a plastic instability as soon as the deformation starts. Through a rule of mixtures, it was found that the greatest strength contribution of the heterogeneous material came from the dislocations on the bcc martensite developed near the sheet edges.
Palabras clave: DISLOCATIONS , HETEROGENEOUS MICROSTRUCTURE , PHASE TRANSFORMATION , STRAIN , TENSILE STRENGTH
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/137376
DOI: http://dx.doi.org/10.1016/j.msea.2020.139779
URL: https://www.sciencedirect.com/science/article/abs/pii/S0921509320308534
Colecciones
Articulos(IFIR)
Articulos de INST.DE FISICA DE ROSARIO (I)
Citación
Muñoz Bolaños, Jairo Alberto; Komissarov, Alexander; Avalos, Martina Cecilia; Bolmaro, Raul Eduardo; Mechanical and microstructural behavior of a heterogeneous austenitic stainless steel processed by Equal Channel Angular Sheet Extrusion (ECASE); Elsevier Science SA; Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing; 792; 139779; 8-2020; 1-11
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