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  Referencia 9510
Título: Fabricación de aceros ultrafinos mediante deformación plástica severa; torsión a alta presión
Título original: Ultrafine grain structure of medium carbon steel prepared by hpt severe plastic deformation method
Autor: Zrnik, Jozef; Scheriau, Stephan; Pippan, Reinhard
Resumen: Using the high pressure torsion (HPT) deformation method the medium carbon steel (AISI 1045) was an experimental material to conduct deformation process The torsion deformation experiment was performed at room and increased temperature of 400 degrees C The influence of deformation processing parameters, resolved shear strain Y (number of turns N = 1-6) and applied pressure p (constant pressure of 7 GPa), was evaluated by microstructure analysis and mechanical properties The strength behaviour was assessed by microhardness measurements across the disc to detect the positional hardening, by tensile tests and by in-situ measured torque In-situ measurement of torque during deformation allows characterizing the changes in mechanical properties due to the large shear deformation developed across the disc To obtain absolute values of strength the ultimate tensile strength was measured in radial direction in respect to the deformed sample From each deformed disc two sub-sized tensile test specimens with gauge length of 2 5 mm were machined The tensile strength in samples increased markedly with the number of turns The hardness measured at disc edge was gradually increasing as straining increases until it saturates after 2-3 turns However, the hardness values at edge were different from those measured in disc center and for applied straining no saturation were reached across the disc The SEM and TEM investigations were carried out to analyze the fine microstructure evolution regarding the strain introduced To follow the difference in strain distribution across the deformed disc the microstructure analysis was performed at edge and central site of the disc in order to evaluate the effect of the strain distribution. TEM investigation confirmed the increasing misorientation even in very small grains, the fragmentation and dissolution of the cementite lamellae, (diffuse cementite/ferrite boundaries), the alignment of the fragments to the shear plane with acceding deformation Indistinctive deformation of ferrite at centre of disc and preserved cementite lamellae morphology were found at the centre of the disc
Idioma: Inglés     País: Czech Republic     ISBN / ISSN: 978-80-87294-13-0     Año: 2009
Tipo: Artículo
Área: Materiales y Materias primas > Nanomateriales
Subsectores de aplicación: · Arte en metal
· Fabricación de productos metálicos, excepto maquinaria y equipo
Entidad: COMTES FHT Ltd, Dobrany 33441
Fuente: NANOCON 2009, CONFERENCE PROCEEDINGS
Localización en fuente: Pages: 96-100
Descriptores: high pressure torsion (HPT); SEM and TEM investigations;Deformacion plastica severa; Severe Plastic deformation; ultrafine grain; granos ultrafinos
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