Laser surfacetexturingisoftenemployedtoimprovetribologicalperformancesofmatingsurfaces.Theprincipalaimofthepresentworkistostudylocalmodificationsinducedbylaserbeamduringthetexturingprocess(microdimpling),onthemechanicalpropertiesofa30NiCrMo12nitridesteel.A brieftribologicalcharacterizationwasinitiallymadeinordertoverifytheimprovementoftribologicalbehaviourensuredbymicrodimpling.Frictionmeasurementswerecarriedoutinlubricatedflat-on-flatandround-on-flatconfigurations.A sub-surfacecharacterizationwasperformedbyfocusedionbeamcross-sectionandimaging.Modifiedmateriallayerswerediscoveredincorrespondenceoflaser-affectedzonesarounddimples,where graindimensionswereobservedtobereduced.Toquantifythisphenomenon,anewtheoreticalenergetic modelwasdeveloped.Hardness measurementswereperformedbyatomicforcemicroscopenanoindentation.Thisapproach allowedtoobserveanhardeningeffectmovingfrombulkmaterialtodimpleedges.Therefore, thetheoreticalmodelwasintegratedwiththeHall–Petch’slawinordertoquantifytheobservedhardeningbehaviour.& 2008ElsevierLtd.Allrightsreserved.

Increasing nanohardness and reducing friction of nitride steel by surface laser texturing / Gualtieri, Enrico; Borghi, A; Calabri, L; Pugno, N; Valeri, Sergio. - In: TRIBOLOGY INTERNATIONAL. - ISSN 0301-679X. - STAMPA. - 42:(2009), pp. 699-705.

Increasing nanohardness and reducing friction of nitride steel by surface laser texturing

GUALTIERI, Enrico;VALERI, Sergio
2009-01-01

Abstract

Laser surfacetexturingisoftenemployedtoimprovetribologicalperformancesofmatingsurfaces.Theprincipalaimofthepresentworkistostudylocalmodificationsinducedbylaserbeamduringthetexturingprocess(microdimpling),onthemechanicalpropertiesofa30NiCrMo12nitridesteel.A brieftribologicalcharacterizationwasinitiallymadeinordertoverifytheimprovementoftribologicalbehaviourensuredbymicrodimpling.Frictionmeasurementswerecarriedoutinlubricatedflat-on-flatandround-on-flatconfigurations.A sub-surfacecharacterizationwasperformedbyfocusedionbeamcross-sectionandimaging.Modifiedmateriallayerswerediscoveredincorrespondenceoflaser-affectedzonesarounddimples,where graindimensionswereobservedtobereduced.Toquantifythisphenomenon,anewtheoreticalenergetic modelwasdeveloped.Hardness measurementswereperformedbyatomicforcemicroscopenanoindentation.Thisapproach allowedtoobserveanhardeningeffectmovingfrombulkmaterialtodimpleedges.Therefore, thetheoreticalmodelwasintegratedwiththeHall–Petch’slawinordertoquantifytheobservedhardeningbehaviour.& 2008ElsevierLtd.Allrightsreserved.
42
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705
Increasing nanohardness and reducing friction of nitride steel by surface laser texturing / Gualtieri, Enrico; Borghi, A; Calabri, L; Pugno, N; Valeri, Sergio. - In: TRIBOLOGY INTERNATIONAL. - ISSN 0301-679X. - STAMPA. - 42:(2009), pp. 699-705.
Gualtieri, Enrico; Borghi, A; Calabri, L; Pugno, N; Valeri, Sergio
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/608645
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