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1、MaterialsandDesign30(2009)1691–1696ContentslistsavailableatScienceDirectMaterialsandDesignjournalhomepage:www.elsevier.com/locate/matdesAstudyonhightemperaturegasnitridingandtemperingheattreatmentin17Cr–1Ni–0.5CH.W.Lee*,J.H.Kong,D.J.Lee,H.Y.On,J.H.SungDe
2、partmentofMaterialsScienceandEngineering,Dong-AUniversity,840Hadan-dong,Saha-gu,Busan604-714,RepublicofKoreaarticleinfoabstractArticlehistory:Theeffectofthehightemperinggasnitriding(HTGN)andtemperingtreatmentin17Cr–1Ni–0.5C(CN)Received23May2008steelwasex
3、perimentallyinvestigated.TheHTGNwascarriedoutat1050°Cfor1hinagaseousatmo-Accepted8July2008spherecontaining98.07kPaofnitrogen.ChromiumnitridesandtheaustenitephaseappearedintheAvailableonline29July2008nitrogen-permeatedsurfacelayer,whereas,theinteriorregio
4、n,intowhichnitrogendidnotpermeate,exhibitedmartensiteandaustenitephasesalongwiththechromiumcarbides.ThenitrogencontentKeywords:wasapproximately0.3%atadepthof5lmbelowthesurfacelayerintheCNspecimenaftertheHTGN.C.HeattreatmentsThehardnessoftheoutmostsurface
5、oftheHTGNtreatedspecimenmeasured538Hv.Whenitwastem-C.Surfacetreatmentsperedat550°Cfor1h,thehardnessoftheoutmostsurfacewas860HvasaresultoftheprecipitationofF.MicrostructuremostlyCr2NalongwithasmallamountofCr23C6andthesecondaryhardeningeffect.Ó2008Elsevier
6、Ltd.Allrightsreserved.1.Introductionthenitrogencontentatthesurface.ThisinvestigationwasaimedatunderstandingthecharacteristicsoftheHTGNandtemperingIngeneral,martensitesteelscontaining12–18%ofchromiumeffectin17Cr–1Ni–0.5Csteel.andupto1%ofcarbonarewidelyuse
7、dinmanyindustrialapplica-tionssuchasmachinerycomponents,toolsandboilersduetotheirgoodmechanicalproperties.Previously,addingnitrogen,whichis2.Experimentalastrongaustenitestabilizer,tostainlesssteelswasdifficulttoachieve,howeveritbecamepossiblewiththeintrod
8、uctionofthe2.1.Specimenpreparationpresenthightechniqueintothesteelmakingprocess.[1].Sincenitrogenasaninterstitialatomisapotentsolidsolutionstrength-Thesteelusedinthisinvestigationwasnitrogenalloyed17Cr–ener,itisreportedtha
