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Nanoindentation and nanoscratching of a ferrite/austenite iron bi-crystal: An atomistic study
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörsvetenskap och fysik (from 2013).ORCID-id: 0000-0003-0205-0178
Helmholtz Zentrum Dresden-Rossendorf, Germany.
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörsvetenskap och fysik (from 2013).ORCID-id: 0000-0001-6029-2613
2018 (engelsk)Inngår i: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 127, s. 231-239Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Molecular dynamics simulations are applied to investigate the wear/friction behavior of a ferrite/austenite iron bi-crystal, as a model system for duplex stainless steels. The plasticity of the ferrite phase is dominated by dislocations while both dislocations and stacking faults are the primary cause of plastic deformation of the austenite phase. Interestingly, the responses of tribological parameters vary depending on the scratch direction. For instance, the scratch hardness is increased by about 46% whereas the friction coefficient is reduced by about 22% when scratch starts from austenite to ferrite. At the interface, a local softening/hardening occurs because of dislocation-interface interaction. The present results demonstrate that martensitic phase transformation is responsible for experimentally observed high amount of ferrite of the pile-up.

sted, utgiver, år, opplag, sider
Elsevier, 2018. Vol. 127, s. 231-239
HSV kategori
Forskningsprogram
Materialteknik
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URN: urn:nbn:se:kau:diva-69118DOI: 10.1016/j.triboint.2018.06.017ISI: 000442334100022OAI: oai:DiVA.org:kau-69118DiVA, id: diva2:1246422
Tilgjengelig fra: 2018-09-07 Laget: 2018-09-07 Sist oppdatert: 2018-09-13bibliografisk kontrollert

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AlMotasem, Ahmed TamerBergström, Jens

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