A Strain-Compensated Constitutive Model for Describing the Hot Compressive Deformation Behaviors of an Aged Inconel 718 Superalloy

Ying Zhou*, Xiao Min Chen, Shengfeng Qin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
17 Downloads (Pure)

Abstract

The hot deformation behaviors of an aged Inconel 718 superalloy are investigated by isothermal compression experiments at four strain rates and five deformation temperatures on a Gleeble-3500 thermo-mechanical simulator. The experimental results show that the true stresses are obviously affected by strain rate and deformation temperature. The true stress increases rapidly at the beginning of hot compressive deformation, which ascribes to the intense work hardening. The true stresses at high deformation temperatures are lower than those at lower deformation temperatures. The dynamic softening induced by DRX is weak at a relatively low deformation temperature. A strain-compensated Arrhenius-type constitutive equation linked with true stress, strain rate and deformation temperature is developed for the studied superalloy. The material constants (α \alpha , n, Q and A) in the developed model are expressed as the functions of true strain. The flow stresses calculated by the developed constitutive equation are nicely consistent with the experimental ones, which confirms that the developed constitutive equation can accurately describe the hot deformation behaviors of the studied superalloy.

Original languageEnglish
Pages (from-to)436-443
Number of pages8
JournalHigh Temperature Materials and Processes
Volume38
Issue number2019
Early online date15 Dec 2018
DOIs
Publication statusPublished - 25 Feb 2019

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