Global and High-Resolution Damage Quantification in Dual-Phase Steel Bending Samples with Varying Stress States
In a variety of modern, multi-phase steels, damage evolves during plastic deformation in the form of the nucleation, growth and coalescence of voids in the microstructure. These microscopic sites play a vital role in the evolution of the materials’ mechanical properties, and therefore the...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-03-01
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| Series: | Metals |
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| Online Access: | http://www.mdpi.com/2075-4701/9/3/319 |
| _version_ | 1819170157989199872 |
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| author | Rickmer Meya Carl F. Kusche Christian Löbbe Talal Al-Samman Sandra Korte-Kerzel A. Erman Tekkaya |
| author_facet | Rickmer Meya Carl F. Kusche Christian Löbbe Talal Al-Samman Sandra Korte-Kerzel A. Erman Tekkaya |
| author_sort | Rickmer Meya |
| collection | DOAJ |
| description | In a variety of modern, multi-phase steels, damage evolves during plastic deformation in the form of the nucleation, growth and coalescence of voids in the microstructure. These microscopic sites play a vital role in the evolution of the materials’ mechanical properties, and therefore the later performance of bent products, even without having yet led to macroscopic cracking. However, the characterization and quantification of these diminutive sites is complex and time-consuming, especially when areas large enough to be statistically relevant for a complete bent product are considered. Here, we propose two possible solutions to this problem: an advanced, SEM-based method for high-resolution, large-area imaging, and an integral approach for calculating the overall void volume fraction by means of density measurement. These are applied for two bending processes, conventional air bending and radial stress superposed bending (RSS bending), to investigate and compare the strain- and stress-state dependent void evolution. RSS bending reduces the stress triaxiality during forming, which is found to diminish the overall formation of damage sites and their growth by the complimentary characterization approaches of high-resolution SEM and global density measurements. |
| first_indexed | 2024-12-22T19:30:56Z |
| format | Article |
| id | doaj.art-e99d0685c13b4bdeaa98fbd12d5933bc |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-22T19:30:56Z |
| publishDate | 2019-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-e99d0685c13b4bdeaa98fbd12d5933bc2022-12-21T18:15:07ZengMDPI AGMetals2075-47012019-03-019331910.3390/met9030319met9030319Global and High-Resolution Damage Quantification in Dual-Phase Steel Bending Samples with Varying Stress StatesRickmer Meya0Carl F. Kusche1Christian Löbbe2Talal Al-Samman3Sandra Korte-Kerzel4A. Erman Tekkaya5Institute of forming technology and lightweight components, TU Dortmund University, Baroper Str. 303, 44227 Dortmund, GermanyInstitute of physical metallurgy and metal physics, RWTH Aachen, Kopernikusstr. 14, 52056 Aachen, GermanyInstitute of forming technology and lightweight components, TU Dortmund University, Baroper Str. 303, 44227 Dortmund, GermanyInstitute of physical metallurgy and metal physics, RWTH Aachen, Kopernikusstr. 14, 52056 Aachen, GermanyInstitute of physical metallurgy and metal physics, RWTH Aachen, Kopernikusstr. 14, 52056 Aachen, GermanyInstitute of forming technology and lightweight components, TU Dortmund University, Baroper Str. 303, 44227 Dortmund, GermanyIn a variety of modern, multi-phase steels, damage evolves during plastic deformation in the form of the nucleation, growth and coalescence of voids in the microstructure. These microscopic sites play a vital role in the evolution of the materials’ mechanical properties, and therefore the later performance of bent products, even without having yet led to macroscopic cracking. However, the characterization and quantification of these diminutive sites is complex and time-consuming, especially when areas large enough to be statistically relevant for a complete bent product are considered. Here, we propose two possible solutions to this problem: an advanced, SEM-based method for high-resolution, large-area imaging, and an integral approach for calculating the overall void volume fraction by means of density measurement. These are applied for two bending processes, conventional air bending and radial stress superposed bending (RSS bending), to investigate and compare the strain- and stress-state dependent void evolution. RSS bending reduces the stress triaxiality during forming, which is found to diminish the overall formation of damage sites and their growth by the complimentary characterization approaches of high-resolution SEM and global density measurements.http://www.mdpi.com/2075-4701/9/3/319damagecharacterizationautomated void recognitiondensitybendingstress superposition |
| spellingShingle | Rickmer Meya Carl F. Kusche Christian Löbbe Talal Al-Samman Sandra Korte-Kerzel A. Erman Tekkaya Global and High-Resolution Damage Quantification in Dual-Phase Steel Bending Samples with Varying Stress States Metals damage characterization automated void recognition density bending stress superposition |
| title | Global and High-Resolution Damage Quantification in Dual-Phase Steel Bending Samples with Varying Stress States |
| title_full | Global and High-Resolution Damage Quantification in Dual-Phase Steel Bending Samples with Varying Stress States |
| title_fullStr | Global and High-Resolution Damage Quantification in Dual-Phase Steel Bending Samples with Varying Stress States |
| title_full_unstemmed | Global and High-Resolution Damage Quantification in Dual-Phase Steel Bending Samples with Varying Stress States |
| title_short | Global and High-Resolution Damage Quantification in Dual-Phase Steel Bending Samples with Varying Stress States |
| title_sort | global and high resolution damage quantification in dual phase steel bending samples with varying stress states |
| topic | damage characterization automated void recognition density bending stress superposition |
| url | http://www.mdpi.com/2075-4701/9/3/319 |
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