abstract

• The empirical model of dynamic recrystallization (DRX) coupled with DEFORM 3D® software (based on the finite element method (FEM)) was used to predict the microstructural evolution of the AA7075 processed by four passes of equal channel angular pressing (ECAP) at 250° C. The DRX model parameters were taken from the literature. The simulation results showed that the DRX exhibited a heterogeneous distribution from the back to the frontal part of the sample and this heterogeneity markedly diminished in the fourth pass. The recrystallized volume fraction reached 50%25 in most of the sample in the fourth pass and the average grain size did not show significant changes, going from an initial value of 16.4 μm to 12.5 μm. This latter result was attributed to the fact that DRX occurred partially even for the last pass. Experimental testing of ECAP was conducted by using the same conditions of computational simulation. The validation of model was performed by comparison of average grain size values with those obtained experimentally by means of image analysis applied on micrographs that were acquired by means of optical microscopy (OM). Hardness and peak load values also indicated the occurrence of a partial dynamic recrystallization and recovery. Copyright © 2017 ASME.

authors

• Hernández Rivera José Luis
• Ramos Azpeitia Mitsuo Osvaldo
• Rivera J.D.J.C.
• Vázquez P.J.C.
• Zugasti P.D.J.G.

publication date

• 2017-01-01

funding provided via

• 2198, C16-FAI-09-63.63  Grant
• Consejo Nacional de Ciencia y Tecnología, CONACYT  Grant
• Universidad Autónoma de San Luis Potosí, UASLP  Grant

published in

• ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)  Proceedings

keywords

• Finite element model; Grains size; Materials processing; Microstructure property relationships Crystal microstructure; Dynamic recrystallization; Dynamics; Equal channel angular pressing; Grain size and shape; Pressing (forming); Recrystallization (metallurgy); Average grain size; Computational simulation; Experimental testing; Heterogeneous distributions; Materials processing; Microstructure-property relationships; Recrystallization and recovery; Severe Deformation; Finite element method

Digital Object Identifier (DOI)

• 10.1115/IMECE2017-72508

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volume

• 2