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Mechanism Based Flow Stress Model for Alloy 625 and Alloy 718
To predict the final geometry in thermo-mechanical processes, the use of modeling tools is of great importance. One important part of the modeling process is to describe the response correctly. A previously published mechanism-based flow stress model has been further developed and adapted for the ni...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7763616/ https://www.ncbi.nlm.nih.gov/pubmed/33317127 http://dx.doi.org/10.3390/ma13245620 |
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author | Malmelöv, Andreas Fisk, Martin Lundbäck, Andreas Lindgren, Lars-Erik |
author_facet | Malmelöv, Andreas Fisk, Martin Lundbäck, Andreas Lindgren, Lars-Erik |
author_sort | Malmelöv, Andreas |
collection | PubMed |
description | To predict the final geometry in thermo-mechanical processes, the use of modeling tools is of great importance. One important part of the modeling process is to describe the response correctly. A previously published mechanism-based flow stress model has been further developed and adapted for the nickel-based superalloys, alloy 625, and alloy 718. The updates include the implementation of a solid solution strengthening model and a model for high temperature plasticity. This type of material model is appropriate in simulations of manufacturing processes where the material undergoes large variations in strain rates and temperatures. The model also inherently captures stress relaxation. The flow stress model has been calibrated using compression strain rate data ranging from 0.01 to 1 s(−1) with a temperature span from room temperature up to near the melting temperature. Deformation mechanism maps are also constructed which shows when the different mechanisms are dominating. After the model has been calibrated, it is validated using stress relaxation tests. From the parameter optimization, it is seen that many of the parameters are very similar for alloy 625 and alloy 718, although it is two different materials. The modeled and measured stress relaxation are in good agreement. |
format | Online Article Text |
id | pubmed-7763616 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-77636162020-12-27 Mechanism Based Flow Stress Model for Alloy 625 and Alloy 718 Malmelöv, Andreas Fisk, Martin Lundbäck, Andreas Lindgren, Lars-Erik Materials (Basel) Article To predict the final geometry in thermo-mechanical processes, the use of modeling tools is of great importance. One important part of the modeling process is to describe the response correctly. A previously published mechanism-based flow stress model has been further developed and adapted for the nickel-based superalloys, alloy 625, and alloy 718. The updates include the implementation of a solid solution strengthening model and a model for high temperature plasticity. This type of material model is appropriate in simulations of manufacturing processes where the material undergoes large variations in strain rates and temperatures. The model also inherently captures stress relaxation. The flow stress model has been calibrated using compression strain rate data ranging from 0.01 to 1 s(−1) with a temperature span from room temperature up to near the melting temperature. Deformation mechanism maps are also constructed which shows when the different mechanisms are dominating. After the model has been calibrated, it is validated using stress relaxation tests. From the parameter optimization, it is seen that many of the parameters are very similar for alloy 625 and alloy 718, although it is two different materials. The modeled and measured stress relaxation are in good agreement. MDPI 2020-12-09 /pmc/articles/PMC7763616/ /pubmed/33317127 http://dx.doi.org/10.3390/ma13245620 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Malmelöv, Andreas Fisk, Martin Lundbäck, Andreas Lindgren, Lars-Erik Mechanism Based Flow Stress Model for Alloy 625 and Alloy 718 |
title | Mechanism Based Flow Stress Model for Alloy 625 and Alloy 718 |
title_full | Mechanism Based Flow Stress Model for Alloy 625 and Alloy 718 |
title_fullStr | Mechanism Based Flow Stress Model for Alloy 625 and Alloy 718 |
title_full_unstemmed | Mechanism Based Flow Stress Model for Alloy 625 and Alloy 718 |
title_short | Mechanism Based Flow Stress Model for Alloy 625 and Alloy 718 |
title_sort | mechanism based flow stress model for alloy 625 and alloy 718 |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7763616/ https://www.ncbi.nlm.nih.gov/pubmed/33317127 http://dx.doi.org/10.3390/ma13245620 |
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