Influence of initial heat treatment of 17-4 PH stainless steel on gas nitriding kinetics

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1、Surface&CoatingsTechnology202(2008)4834-4838ContentslistsavailableatScienceDirectSurface&CoatingsTechnologyjournalhomepage:www.elsevier.com/locate/surfcoatInfluenceofinitialheattreatmentof17-4PHstainlesssteelongasnitridingkineticsP.Kochmanski,J.Nowacki⁎SzczecinUnivers

2、ityofTechnology,Al.Piastow17,70-310Szczecin,PolandARTICLEINFOABSTRACTArticlehistory:Resultsoftheinvestigationofnitridedlayerson17-4PHtypeprecipitationhardeningstainlesssteelareReceived11December2007presentedinthispaper.Thelayershavebeenproducedintheprocessofgasnitrid

3、inginapartlydissociatedAcceptedinrevisedform14April2008ammoniaattemperaturesbetween410and570°C.HydrogenchlorideadmixturetoactiveatmospherewasAvailableonline26April2008usedasasurfaceactivator.Structureofthenitridedlayerswereexaminedusingscanningandtransmissionelectron

4、microscopy,X-raymicroanalysis(EDXandWDX),andX-raydiffraction.TheinfluenceoftheinitialKeywords:steelheattreatmentonthenitridingkineticshasbeenconsidered.17-4PHstainlesssteelwasnitridedatPrecipitationhardeningstainlesssteel17-4PHsteelvariousheattreatmentconditions,i.e.a

5、ftersolutiontreatmentorageingatdifferenttemperatures.TheGasnitridinginfluenceofprecipitationprocessestakingplaceduringtheheattreatmentbeforenitridingonthediffusiveprocesskineticswasproven.Itwasfoundthat,thatincreasingofsteelageingtemperatureupto600°Cbeforenitridingeff

6、ectsonanincreasingofthenitridingkinetics.©2008ElsevierB.V.Allrightsreserved.1.IntroductionUnfortunately,precipitationhardeningsteelshaveinsufficientwearresistance,thereforethereisanecessityofincreasingitby17-4PHsteelbelongstoprecipitation–hardening(PH)stainlesssurface

7、engineeringmethods.Oneofthemostefficientmethodofsteelsgroupanditismorecommonthananyothertypeofmaterialsincreasingwearresistanceisnitriding.Incasesofcomplicatedshapefromthisgroupduetobalancedcombinationofgoodmechanicalelementswithmanyhardtoreachsurfaces,themostusableis

8、gaspropertiesandexcellentcorrosionresistance.Thisalloyisanitridingcontrarytoplasmanitriding.martensitestainlesssteelcontainingappro