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. - 42:5(2009), pp. 699-705. [10.1016/j.triboint.2008.09.008]
Increasing nanohardness and reducing friction of nitride steel by surface laser texturing
GUALTIERI, Enrico;VALERI, Sergio
2009
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.
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