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Article

Successive Grinding and Polishing Effect on the Retained Austenite in the Surface of 42CrMo4 Steel

1
Department of Experimental Physics, Faculty of Science, Palacký University Olomouc, 17. listopadu 1192/12, 77146 Olomouc, Czech Republic
2
Institute of Chemistry, Eötvös Loránd University, Pázmány Péter Sétány 1/A, 1117 Budapest, Hungary
3
Department of Manufacturing Technology, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2, 61669 Brno, Czech Republic
4
Institute of Physics of Materials, Czech Academy of Sciences, Zizkova 22, 61662 Brno, Czech Republic
*
Authors to whom correspondence should be addressed.
Academic Editors: Pere Bruna and Giovanni Principi
Metals 2022, 12(1), 119; https://doi.org/10.3390/met12010119
Received: 10 November 2021 / Revised: 15 December 2021 / Accepted: 24 December 2021 / Published: 7 January 2022
(This article belongs to the Special Issue Mössbauer Analysis Applied to Metals, Alloys and Compounds)
Low-alloy 42CrMo4 steels were studied by 57Fe Mössbauer spectroscopy (MS), X-ray diffractometry (XRD), and Energy Dispersive X-ray Spectroscopy (EDS) measurements. The investigations were performed on metallographic samples, which were subjected to a series of successive grinding and polishing with a progressively finer grit. Conversion X-ray Mössbauer spectroscopy (CXMS) was used to determine the occurrence of austenite in steel samples. It is a unique method detecting the austenite content very sensitively. Six samples with different surface preparation were investigated, starting with 4.8% of austenite on an as-cut sample, and a large decrease in the retained austenite to 2.6% was observed after the first grinding of a hardened cut sample. Additionally, an unexpectedly large decrease in the austenite content to 2.3% was found due to the final polishing. A second time applied successive grinding and polishing of all samples resulted in identical austenite content determined by CXMS of approx. 5%, which proved the applicability of the CXMS method. Generally, the result calls attention to the importance of preparation of metallurgical samples by grinding and polishing where the results can vary significantly on the level of surface processing. View Full-Text
Keywords: steel microstructure; grinding; polishing; austenite; Mössbauer spectroscopy; 42CrMo4 steel microstructure; grinding; polishing; austenite; Mössbauer spectroscopy; 42CrMo4
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MDPI and ACS Style

Pechoušek, J.; Kuzmann, E.; Vondrášek, R.; Olina, A.; Vrba, V.; Kouřil, L.; Ingr, T.; Král, P.; Mashlan, M. Successive Grinding and Polishing Effect on the Retained Austenite in the Surface of 42CrMo4 Steel. Metals 2022, 12, 119. https://doi.org/10.3390/met12010119

AMA Style

Pechoušek J, Kuzmann E, Vondrášek R, Olina A, Vrba V, Kouřil L, Ingr T, Král P, Mashlan M. Successive Grinding and Polishing Effect on the Retained Austenite in the Surface of 42CrMo4 Steel. Metals. 2022; 12(1):119. https://doi.org/10.3390/met12010119

Chicago/Turabian Style

Pechoušek, Jiří, Ernö Kuzmann, René Vondrášek, Anna Olina, Vlastimil Vrba, Lukáš Kouřil, Tomáš Ingr, Petr Král, and Miroslav Mashlan. 2022. "Successive Grinding and Polishing Effect on the Retained Austenite in the Surface of 42CrMo4 Steel" Metals 12, no. 1: 119. https://doi.org/10.3390/met12010119

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