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...
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| Format: | Article |
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MDPI AG
2020-12-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/13/24/5620 |
| _version_ | 1797545233882284032 |
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| author | Andreas Malmelöv Martin Fisk Andreas Lundbäck Lars-Erik Lindgren |
| author_facet | Andreas Malmelöv Martin Fisk Andreas Lundbäck Lars-Erik Lindgren |
| author_sort | Andreas Malmelöv |
| collection | DOAJ |
| 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<sup>−1</sup> 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. |
| first_indexed | 2024-03-10T14:12:36Z |
| format | Article |
| id | doaj.art-539919fefe2a43a1b1a9972a3601a34a |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T14:12:36Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-539919fefe2a43a1b1a9972a3601a34a2023-11-21T00:03:45ZengMDPI AGMaterials1996-19442020-12-011324562010.3390/ma13245620Mechanism Based Flow Stress Model for Alloy 625 and Alloy 718Andreas Malmelöv0Martin Fisk1Andreas Lundbäck2Lars-Erik Lindgren3Division of Mechanics of Solid Materials, Luleå University of Technology, SE-971 87 Luleå, SwedenDepartment of Materials Science and Applied Mathematics, Malmö University, SE-205 06 Malmö, SwedenDivision of Mechanics of Solid Materials, Luleå University of Technology, SE-971 87 Luleå, SwedenDivision of Mechanics of Solid Materials, Luleå University of Technology, SE-971 87 Luleå, SwedenTo 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<sup>−1</sup> 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.https://www.mdpi.com/1996-1944/13/24/5620material modelflow stress modeldislocation densityInconelstress relaxation |
| spellingShingle | Andreas Malmelöv Martin Fisk Andreas Lundbäck Lars-Erik Lindgren Mechanism Based Flow Stress Model for Alloy 625 and Alloy 718 Materials material model flow stress model dislocation density Inconel stress relaxation |
| 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 | material model flow stress model dislocation density Inconel stress relaxation |
| url | https://www.mdpi.com/1996-1944/13/24/5620 |
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