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Effect of carburizing time treatment on microstructure and mechanical properties of low alloy gear steels

2024Journal article Open access
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datacite.subject.fosEngenharia e Tecnologia
datacite.subject.sdg09:Indústria, Inovação e Infraestruturas
dc.contributor.authorBoumediri, Haithem
dc.contributor.authorTouati, Sofiane
dc.contributor.authorDebbah, Younes
dc.contributor.authorSelami, Salim
dc.contributor.authorChitour, Mourad
dc.contributor.authorKhelifa, Mansouri
dc.contributor.authorKahaleras, Mohamed said
dc.contributor.authorBoumediri, Khaled
dc.contributor.authorZemmouri, Amina
dc.contributor.authorAthmani, Moussa
dc.contributor.authorFernandes, Filipe
dc.date.accessioned2025-01-28T13:39:42Z
dc.date.available2025-01-28T13:39:42Z
dc.date.issued2024
dc.description.abstractGas carburizing significantly enhances the surface properties of low-alloy gear steels, resulting in superior micro-hardness, layer thickness, carbon content, and overall mechanical properties. Unlike other thermochemical processes such as nitriding and carbonitriding, which have limitations in core properties and hardening depth, gas carburizing offers unmatched surface hardness, wear resistance, and mechanical strength. This makes it ideal for demanding applications in the automotive, aerospace, and manufacturing industries. In this research, samples were gas-carburized for 4, 6, or 8 h. The results showed significant improvements: micro-hardness increased from approximately 140 HV to over 819 HV, and the surface layer thickness grew by more than 41%, from 1166 μm to 1576 μm. Additionally, the carbon content in the surface layer increased by over 450%, reaching up to 0.94 wt%. Clear correlations were observed between the duration of heating and the mechanical properties. Longer heating times, particularly after 8 h, raised ultimate tensile strength from 427.29 MPa to 778.33 MPa, while simultaneously decreasing elongation from 26.07% to 2.88% and resilience from 180 J cm−2 to 6.66 J cm−2. This optimization not only enhances surface hardness and durability but also improves key mechanical properties such as tensile strength, stiffness, resilience, and overall mechanical performance.eng
dc.description.sponsorshipFilipe Fernandes acknowledges the UIDB/00285/2020 and LA/P/0112/2020 projects, sponsored by FEDER Funds through Portugal 2020 (PT2020), the Competitiveness and Internationalization Operational Program (COMPETE 2020), and national funds through the Portuguese Foundation for Science and Technology (FCT).
dc.identifier.citationHaithem Boumediri et al 2024 Mater. Res. Express 11 076505
dc.identifier.doi10.1088/2053-1591/ad5cd6
dc.identifier.issn2053-1591
dc.identifier.urihttp://hdl.handle.net/10400.22/29305
dc.language.isoeng
dc.peerreviewedyes
dc.publisherIOP Publishing
dc.relationCentre for Mechanical Enginnering, Materials and Processes
dc.relation.hasversionhttps://iopscience.iop.org/article/10.1088/2053-1591/ad5cd6
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectGas carburizing
dc.subjectThermochemical treatment
dc.subjectHolding time optimization
dc.subjectMicro-hardness
dc.titleEffect of carburizing time treatment on microstructure and mechanical properties of low alloy gear steelseng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCentre for Mechanical Enginnering, Materials and Processes
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00285%2F2020/PT
oaire.citation.issue7
oaire.citation.titleMaterials Research Express
oaire.citation.volume11
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
relation.isProjectOfPublicatione9972dd7-ceaf-49ee-959a-d2a0e393b124
relation.isProjectOfPublication.latestForDiscoverye9972dd7-ceaf-49ee-959a-d2a0e393b124

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