Density-based constitutive modelling of P/M FGH96 for powder forging

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Title: Density-based constitutive modelling of P/M FGH96 for powder forging
Authors: Chavoshi, SZ
Jiang, J
Wang, Y
Fang, S
Wang, S
Shi, Z
Lin, J
Item Type: Journal Article
Abstract: A set of viscoplastic constitutive equations is presented in this study to predict hot compressive deformation behaviour and densification levels of powder metallurgy (P/M) FGH96 nickel-base superalloy during direct powder forging (DPF) process. The constitutive equations make use of the elliptic equivalent stress proposed in porous material models, and unify the evolution of relative density, normalised dislocation density, isotropic hardening and flow softening of the powder compact. A gradient-based optimisation technique is adopted to determine the material constants using the experimental data obtained from Gleeble isothermal uniaxial compression tests of HIPed FGH96 at different temperatures and strain rates. The developed constitutive equations are incorporated into finite element code DEFORM via user-defined subroutine for coupled thermo-mechanical DPF process modelling. The constitutive equations benefiting from the viscoplastic densification model of the calibrated Abouaf, among the six studied porous material models, compare favourably with the experimental data, while the equations integrating the porous material model of Shima and Oyane provide excellent agreement with experiments in the low density outer region of the powder compact.
Issue Date: 3-Feb-2018
Date of Acceptance: 2-Feb-2018
URI: http://hdl.handle.net/10044/1/57283
DOI: https://dx.doi.org/10.1016/j.ijmecsci.2018.02.003
ISSN: 0020-7403
Publisher: Elsevier
Start Page: 110
End Page: 121
Journal / Book Title: International Journal of Mechanical Sciences
Volume: 138-139
Copyright Statement: © 2018 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Beijing Institute of Aeronautical Materials (BIAM)
Funder's Grant Number: N/A
Keywords: 0910 Manufacturing Engineering
0905 Civil Engineering
0913 Mechanical Engineering
Mechanical Engineering & Transports
Publication Status: Published
Open Access location: https://doi.org/10.1016/j.ijmecsci.2018.02.003
Appears in Collections:Faculty of Engineering
Mechanical Engineering



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