Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
FINITE ELEMENT SIMULATION OF STRAIN HETEROGENEITY IN METALS WITH DIFFERENT WORK HARDENING CHARACTERISTICS SUBMITTED TO HIGH PRESSURE TORSION
Submission Author:
Adriano Trajano , MG
Co-Authors:
Adriano Trajano, Marcell Ferreira, Pedro Henrique Alves Martins, benedito junior
Presenter: Adriano Trajano
doi://10.26678/ABCM.COBEM2019.COB2019-0352
Abstract
High pressure torsion is one of severe plastic deformation metal forming techniques, in which high rates of plastic deformation in the samples are achieved by concurrent application of compressive force and torsional straining. As a result, the exceptional grain refinement is obtained, producing ultrafine-grained materials, which present excellent mechanical properties, like increased strength and hardness. Such materials, among other applications, can be submitted to superplastic forming in elevated temperatures and used in forging of mechanical components with complex geometries. Depending on the stress states involved in the process, commonly formed materials exhibit longitudinal and cross-sectional strain heterogeneity. The strain heterogeneity is influenced by work hardening properties of the plastically deformed material, being a determining factor in stress and strain distribution in the processed specimens. In this context, the present work aims to evaluate this influence in metals with different work hardening rates: AISI 304 stainless steel and Interstitial Free steel, submitted to high pressure torsion. The finite element method is employed in the analysis, and in addition the effects of the coefficient of friction between the anvils and the specimens, and of the number of rotations are also assessed. Both materials presented high strain heterogeneity in radial direction. The results, including the effective strain distribution were affected by mechanical and microstructural properties of AISI 304 and Interstitial Free steel used in simulation.
Keywords
high pressure torsion, strain heterogeneity, stainless steel AISI 304, Interstitial Free steel, work hardening
