Test setup for analyzing the electrical resistance during fatigue loading for metastable austenite AISI 304L and its diffusion-brazed joints
The measurement of the electrical resistance of specimens based on the established direct current potential drop (DCPD) method is a widely utilized methodology for the detection of damage mechanisms in the field of crack initiation and propagation and change in microstructural details. These include...
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Elsevier
2025-03-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425000523 |
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| author | Lukas M. Sauer Johannes L. Otto Jonas A. Ziman Peter Starke Frank Walther |
| author_facet | Lukas M. Sauer Johannes L. Otto Jonas A. Ziman Peter Starke Frank Walther |
| author_sort | Lukas M. Sauer |
| collection | DOAJ |
| description | The measurement of the electrical resistance of specimens based on the established direct current potential drop (DCPD) method is a widely utilized methodology for the detection of damage mechanisms in the field of crack initiation and propagation and change in microstructural details. These include, e.g., dislocation density, void volume fraction, and micro- and macro-cracks. Given the necessity to consider additional factors influencing the electrical resistance, e.g., specimen geometry and temperature, ex-situ measurement techniques are frequently employed through interruption of fatigue testing. However, ex-situ investigations may result in unintended influences, such as changes in contacting, and analyze only discrete states limiting the characterization possibilities and result interpretation. Accordingly, in-situ electrical resistance measurements were employed in this study to characterize the microstructural changes during fatigue with cyclic creeping. To quantify and compensate the effects of geometry, temperature, and deformation-induced austenite-martensite transformation on the electrical resistance during fatigue loading, a complex experimental setup was developed which includes several measurement systems. The combination of strain measurement and potential drop enables a direct transfer of measured strain to electrical resistance. The method was applied and evaluated on high-temperature diffusion-brazed joints with a metastable austenite as base material and Ni-based filler metal. Finally, the change in microstructure was evaluated through electron channeling contrast imaging (ECCI) analyses at different load cycles. |
| format | Article |
| id | doaj-art-a9d3bf193b90451aa6a962b401569e1f |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-a9d3bf193b90451aa6a962b401569e1f2025-01-15T04:11:40ZengElsevierJournal of Materials Research and Technology2238-78542025-03-0135535544Test setup for analyzing the electrical resistance during fatigue loading for metastable austenite AISI 304L and its diffusion-brazed jointsLukas M. Sauer0Johannes L. Otto1Jonas A. Ziman2Peter Starke3Frank Walther4TU Dortmund University, Chair of Materials Test Engineering (WPT), Dortmund, 44227, Germany; Corresponding author.TU Dortmund University, Chair of Materials Test Engineering (WPT), Dortmund, 44227, GermanyUniversity of Applied Sciences Kaiserslautern, Department of Materials Science & Materials Testing (WWHK), Kaiserslautern, 67659, GermanyUniversity of Applied Sciences Kaiserslautern, Department of Materials Science & Materials Testing (WWHK), Kaiserslautern, 67659, Germany; Saarland University, Faculty of Natural Sciences and Technology, Saarbrücken, 66123, GermanyTU Dortmund University, Chair of Materials Test Engineering (WPT), Dortmund, 44227, GermanyThe measurement of the electrical resistance of specimens based on the established direct current potential drop (DCPD) method is a widely utilized methodology for the detection of damage mechanisms in the field of crack initiation and propagation and change in microstructural details. These include, e.g., dislocation density, void volume fraction, and micro- and macro-cracks. Given the necessity to consider additional factors influencing the electrical resistance, e.g., specimen geometry and temperature, ex-situ measurement techniques are frequently employed through interruption of fatigue testing. However, ex-situ investigations may result in unintended influences, such as changes in contacting, and analyze only discrete states limiting the characterization possibilities and result interpretation. Accordingly, in-situ electrical resistance measurements were employed in this study to characterize the microstructural changes during fatigue with cyclic creeping. To quantify and compensate the effects of geometry, temperature, and deformation-induced austenite-martensite transformation on the electrical resistance during fatigue loading, a complex experimental setup was developed which includes several measurement systems. The combination of strain measurement and potential drop enables a direct transfer of measured strain to electrical resistance. The method was applied and evaluated on high-temperature diffusion-brazed joints with a metastable austenite as base material and Ni-based filler metal. Finally, the change in microstructure was evaluated through electron channeling contrast imaging (ECCI) analyses at different load cycles.http://www.sciencedirect.com/science/article/pii/S2238785425000523In-situ material testingElectrical resistivityDirect current potential drop (DCPD)Microstructural damageDislocation densityElectron channeling contrast imaging (ECCI) |
| spellingShingle | Lukas M. Sauer Johannes L. Otto Jonas A. Ziman Peter Starke Frank Walther Test setup for analyzing the electrical resistance during fatigue loading for metastable austenite AISI 304L and its diffusion-brazed joints Journal of Materials Research and Technology In-situ material testing Electrical resistivity Direct current potential drop (DCPD) Microstructural damage Dislocation density Electron channeling contrast imaging (ECCI) |
| title | Test setup for analyzing the electrical resistance during fatigue loading for metastable austenite AISI 304L and its diffusion-brazed joints |
| title_full | Test setup for analyzing the electrical resistance during fatigue loading for metastable austenite AISI 304L and its diffusion-brazed joints |
| title_fullStr | Test setup for analyzing the electrical resistance during fatigue loading for metastable austenite AISI 304L and its diffusion-brazed joints |
| title_full_unstemmed | Test setup for analyzing the electrical resistance during fatigue loading for metastable austenite AISI 304L and its diffusion-brazed joints |
| title_short | Test setup for analyzing the electrical resistance during fatigue loading for metastable austenite AISI 304L and its diffusion-brazed joints |
| title_sort | test setup for analyzing the electrical resistance during fatigue loading for metastable austenite aisi 304l and its diffusion brazed joints |
| topic | In-situ material testing Electrical resistivity Direct current potential drop (DCPD) Microstructural damage Dislocation density Electron channeling contrast imaging (ECCI) |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425000523 |
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