Test setup for analyzing the electrical resistance during fatigue loading for metastable austenite AISI 304L and its diffusion-brazed joints

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dc.contributor.authorSauer, Lukas Maximilian
dc.contributor.authorOtto, Johannes Leon
dc.contributor.authorZiman, Jonas A.
dc.contributor.authorStarke, Peter
dc.contributor.authorWalther, Frank
dc.date.accessioned2025-05-21T07:47:56Z
dc.date.available2025-05-21T07:47:56Z
dc.date.issued2025-01-08
dc.description.abstractThe 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.en
dc.identifier.urihttp://hdl.handle.net/2003/43702
dc.identifier.urihttp://dx.doi.org/10.17877/DE290R-25476
dc.language.isoen
dc.relation.ispartofseriesJournal of materials research and technology; 35
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectIn-situ material testingen
dc.subjectElectrical resistivityen
dc.subjectDirect current potential drop (DCPD)en
dc.subjectMicrostructural damageen
dc.subjectDislocation densityen
dc.subjectElectron channeling contrast imaging (ECCI)en
dc.subject.ddc660
dc.subject.rswkZerstörungsfreie Werkstoffprüfung
dc.subject.rswkSpezifischer Widerstand
dc.subject.rswkWerkstoffschädigung
dc.subject.rswkRiss
dc.subject.rswkMikrostruktur
dc.subject.rswkRasterelektronenmikroskopie
dc.subject.rswkMaterialermüdung
dc.subject.rswkAustenitischer Stahl
dc.subject.rswkDiffusionslöten
dc.titleTest setup for analyzing the electrical resistance during fatigue loading for metastable austenite AISI 304L and its diffusion-brazed jointsen
dc.typeText
dc.type.publicationtypeArticle
dcterms.accessRightsopen access
eldorado.secondarypublicationtrue
eldorado.secondarypublication.primarycitationSauer, L.M. et al. (2025) ‘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, 35, pp. 535–544. Available at: https://doi.org/10.1016/j.jmrt.2025.01.052
eldorado.secondarypublication.primaryidentifierhttps://doi.org/10.1016/j.jmrt.2025.01.052

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