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Structural Factors Inducing Cracking of Brass Fittings
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SYSNO ASEP 0544636 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Structural Factors Inducing Cracking of Brass Fittings Author(s) Kunčická, Lenka (UFM-A) ORCID
Jambor, Michal (UFM-A) ORCID, RID
Weiser, Adam (UFM-A) ORCID
Dvořák, Jiří (UFM-A) RID, ORCIDNumber of authors 4 Article number 3255 Source Title Materials. - : MDPI
Roč. 14, č. 12 (2021)Number of pages 12 s. Language eng - English Country CH - Switzerland Keywords brass ; cracking ; FEM ; scanning electron microscopy ; transmission electron microscopy ; microhardness Subject RIV JG - Metallurgy OECD category Materials engineering Method of publishing Open access Institutional support UFM-A - RVO:68081723 UT WOS 000667396400001 EID SCOPUS 85108631786 DOI 10.3390/ma14123255 Annotation Cu–Zn–Pb brasses are popular materials, from which numerous industrially and commercially used components are fabricated. These alloys are typically subjected to multiple-step processing—involving casting, extrusion, hot forming, and machining—which can introduce various defects to the final product. The present study focuses on the detailed characterization of the structure of a brass fitting—i.e., a pre-shaped medical gas valve, produced by hot die forging—and attempts to assess the factors beyond local cracking occurring during processing. The analyses involved characterization of plastic flow via optical microscopy, and investigations of the phenomena in the vicinity of the crack, for which we used scanning and transmission electron microscopy. Numerical simulation was implemented not only to characterize the plastic flow more in detail, but primarily to investigate the probability of the occurrence of cracking based on the presence of stress. Last, but not least, microhardness in specific locations of the fitting were examined. The results reveal that the cracking occurring in the location with the highest probability of the occurrence of defects was most likely induced by differences in the chemical composition, the location the crack in which developed exhibited local changes not only in chemical composition—which manifested as the presence of brittle precipitates—but also in beta phase depletion. Moreover, as a result of the presence of oxidic precipitates and the hard and brittle alpha phase, the vicinity of the crack exhibited an increase in microhardness, which contributed to local brittleness. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2022 Electronic address https://www.mdpi.com/1996-1944/14/12/3255
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