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

0554683 - ÚFM 2023 RIV CH eng J - Journal Article
Pechoušek, J. - Kuzmann, E. - Vondrášek, R. - Olina, A. - Vrba, V. - Kouřil, L. - Ingr, T. - Král, Petr - Mashlan, M.
Successive Grinding and Polishing Effect on the Retained Austenite in the Surface of 42CrMo4 Steel.
Metals. Roč. 12, č. 1 (2022), č. článku 119. E-ISSN 2075-4701
Institutional support: RVO:68081723
Keywords : kinetic-behavior * mossbauer * alloys * steel microstructure * grinding * polishing * austenite * Mossbauer spectroscopy * 42CrMo4
OECD category: Materials engineering
Impact factor: 2.9, year: 2022
Method of publishing: Open access
https://www.mdpi.com/2075-4701/12/1/119

Low-alloy 42CrMo4 steels were studied by Fe-57 Mossbauer 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 Mossbauer 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.
Permanent Link: http://hdl.handle.net/11104/0331037