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Nanoindentation and nanoscratching of a ferrite/austenite iron bi-crystal: An atomistic study
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).ORCID iD: 0000-0003-0205-0178
Helmholtz Zentrum Dresden-Rossendorf, Germany.
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).ORCID iD: 0000-0001-6029-2613
2018 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 127, p. 231-239Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 127, p. 231-239
National Category
Materials Engineering
Research subject
Materials Engineering
Identifiers
URN: urn:nbn:se:kau:diva-69118DOI: 10.1016/j.triboint.2018.06.017ISI: 000442334100022OAI: oai:DiVA.org:kau-69118DiVA, id: diva2:1246422
Available from: 2018-09-07 Created: 2018-09-07 Last updated: 2018-09-13Bibliographically approved

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AlMotasem, Ahmed TamerBergström, Jens

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