Study on Hardness of Heat-Treated CoCrMo Alloy Recycled by Electron Beam Melting

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creativework.keywordsCoCrMo alloy, electron beam melting and refining, hardness, heat treatment
creativework.publisherMDPIen
dc.contributor.authorVutova K.
dc.contributor.authorStefanova V.
dc.contributor.authorMarkov M.
dc.contributor.authorVassileva V.
dc.date.accessioned2024-07-10T14:27:05Z
dc.date.accessioned2024-07-10T14:50:38Z
dc.date.available2024-07-10T14:27:05Z
dc.date.available2024-07-10T14:50:38Z
dc.date.issued2023-04-01
dc.description.abstractThe hardness of heat (thermally) treated CoCrMo ingots, recycled by electron beam melting and refining (EBMR) of a technogenic CoCrMo material (waste from the dental technology) under different process conditions (temperature and residence time) is examined. The heat treatment consists of two-step heating up to temperatures of 423 K and 1343 K and retention times of 40 and 60 min, respectively. The influence of various loads (0.98 N, 1.96 N, 2.94 N, 4.9 N, and 9.8 N) on the hardness of the CoCrMo alloy, recycled by EBMR, before and after heat treatment is studied. It has been found that regardless of the EBMR process conditions, the obtained samples after heat treatment have similar hardness values (between 494.2 HV and 505.9 HV) and they are significantly lower than the hardness of the specimens before the heat treatment. The highest hardness (600 HV) is measured in the alloy recycled at 1845 K refining temperature for 20 min. This is due to the smaller crystal structure of the resulting alloy and the higher cobalt content. The results obtained show that the heat treatment leads to considerable changes in the microstructure of the CoCrMo ingots recycled by EBMR. With the increase of the e-beam refining temperature, after the heat treatment, the grains’ size increases and the grains’ shape indicates an incomplete phase transition from γ-fcc to ε-hcp phase. This leads to a slight increase in the hardness of the alloy.
dc.identifier.doi10.3390/ma16072634
dc.identifier.issn1996-1944
dc.identifier.scopusSCOPUS_ID:85152547757en
dc.identifier.urihttps://rlib.uctm.edu/handle/123456789/820
dc.language.isoen
dc.source.urihttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85152547757&origin=inward
dc.titleStudy on Hardness of Heat-Treated CoCrMo Alloy Recycled by Electron Beam Melting
dc.typeArticle
oaire.citation.issue7
oaire.citation.volume16
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