Constitutive modelling of hot deformation behaviour of a CoCrFeMnNi high-entropy alloy |
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Author: | Patnamsetty, Madan1; Saastamoinen, Ari1; Somani, Mahesh C.2; |
Organizations: |
1Materials Science and Environmental Engineering, Tampere University, Tampere, Finland 2Materials and Mechanical Engineering, Centre for Advanced Steels Research, University of Oulu, Oulu, Finland |
Format: | article |
Version: | published version |
Access: | open |
Online Access: | PDF Full Text (PDF, 3 MB) |
Persistent link: | http://urn.fi/urn:nbn:fi-fe2020040610442 |
Language: | English |
Published: |
Informa,
2020
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Publish Date: | 2020-04-06 |
Description: |
AbstractModels describing the constitutive flow behaviour of a metallic material are desired for appropriate process design and realization of defect-free components. In this study, constitutive equations based on the hyperbolic-sinusoidal Arrhenius-type model have been developed to define the hot deformation characteristics of a CoCrFeMnNi high-entropy alloy. The experimental true stress-true strain data were generated over a wide temperature (1023–1423 K) and strain rates (10−3–10 s−1) ranges. The impact of strain rate and temperature on deformation behaviour was further characterized through a temperature compensated strain rate parameter, i.e. Zener-Hollomon parameter. Additionally, a mathematical relation was employed to express the influence of various material constants on true-strain ranging from 0.2 to 0.75. Typical third order polynomial relations were found to be appropriate to fit the true-strain dependency of these material constants. The accuracy of the developed constitutive equations was evaluated by using the average absolute relative error (AARE) and correlation coefficient (R); the obtained values were 7.63% and 0.9858, respectively, suggesting reasonable predictions. These results demonstrate that the developed constitutive equations can predict the flow stress behaviour of the alloy with a good accuracy over a wide range of temperature and strain rate conditions and for large strains. see all
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Series: |
Science and technology of advanced materials |
ISSN: | 1468-6996 |
ISSN-E: | 1878-5514 |
ISSN-L: | 1468-6996 |
Volume: | 21 |
Issue: | 1 |
Pages: | 43 - 55 |
DOI: | 10.1080/14686996.2020.1714476 |
OADOI: | https://oadoi.org/10.1080/14686996.2020.1714476 |
Type of Publication: |
A1 Journal article – refereed |
Field of Science: |
216 Materials engineering |
Subjects: | |
Funding: |
This study was conducted with the support from the TUT Foundation as a part of Tampere University’s graduate school. |
Copyright information: |
© 2020 The Author(s). Published by National Institute for Materials Science in partnership with Taylor & Francis Group.This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. |
https://creativecommons.org/licenses/by-nc/4.0/ |