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Influence of Local Electropolishing Conditions on Ferritic–Pearlitic Steel on X-Ray Diffraction Residual Stress Profiling
RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes.ORCID iD: 0000-0003-2991-2911
RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes.ORCID iD: 0000-0003-3656-1806
RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes.ORCID iD: 0000-0003-1677-1064
RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes.ORCID iD: 0009-0001-8385-4313
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2024 (English)In: Journal of materials engineering and performance (Print), ISSN 1059-9495, E-ISSN 1544-1024, Vol. 33, p. 3682-Article in journal (Refereed) Published
Abstract [en]

Layer removal with electropolishing is a well-established method when measuring residual stress profiles with lab-XRD. This is done to measure the depth impact from processes such as shot peening, heat treatment, or machining. Electropolishing is used to minimize the influence on the inherent residual stresses of the material during layer removal, performed successively in incremental steps to specific depths followed by measurement. Great control of the material removal is critical for the measured stresses at each depth. Therefore, the selection of size of the measurement spot and electropolishing parameters is essential. The main objective in this work is to investigate how different electrolytes and electropolishing equipment affect the resulting surface roughness, geometry, microstructure, and consequently the measured residual stress. A second objective has been to establish a methodology of assessing the acquired electropolished depth. The aim has been to get a better understanding of the influence of the layer removal method on the accuracy of the acquired depth. Evaluation has been done by electropolishing one ground and one shot peened sample of a low-alloy carbon steel, grade 1.1730, with different methods. The results showed a difference in stresses depending on the electrolyte used where the perchloric acid had better ability to retain the stresses compared to the saturated salt. Electropolishing with saturated salt is fast and results in evenly distributed material removal but has high surface roughness, which is due to a difference in electropolishing of the two phases, ferrite, and pearlite. Perchloric acid electropolishing is slower but generates a smooth surface as both ferrite and pearlite have the same material removal rates but may cause an increased material removal for the center of the electropolished area. In this work, it is suggested to use perchloric acid electropolishing for the final layer removal step. © 2023, The Author(s).

Place, publisher, year, edition, pages
Springer , 2024. Vol. 33, p. 3682-
Keywords [en]
electrolytical polishing, perchloric acid, profile, residual stress, saturated salt, Electrolytes, Electrolytic polishing, Ferrite, Pearlite, Salt removal, Shot peening, Surface roughness, Condition, Electropolished, Ferritic, Layer removal, Material removal, Pearlitic steels, Perchloric acids, Saturated salts, Residual stresses
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:ri:diva-65665DOI: 10.1007/s11665-023-08525-wScopus ID: 2-s2.0-85165702085OAI: oai:DiVA.org:ri-65665DiVA, id: diva2:1786456
Note

Correspondence Address: J. Holmberg; RISE Research Institutes of Sweden AB, Gothenburg, Sweden; email: jonas.holmberg@ri.se; 

The authors would like to thank RISE Research Institutes of Sweden AB and Stresstech OY for the support of this study.

Available from: 2023-08-09 Created: 2023-08-09 Last updated: 2024-05-27Bibliographically approved

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Holmberg, JonasBerglund, JohanStormvinter, AlbinAndersson, Pär

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