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1、MaterialsandDesign41(2012)16–22ContentslistsavailableatSciVerseScienceDirectMaterialsandDesignjournalhomepage:www.elsevier.com/locate/matdesShortCommunicationEffectofCuadditiononmicrostructureandmechanicalpropertiesof15%Crsupermartensiticstainlessste
2、elaaaba,⇑DongYe,JunLi,WenJiang,JieSu,KunyuZhaoaFacultyofMaterialsScienceandEngineering,KunmingUniversityofScienceandTechnology,Kunming650093,ChinabInstituteforStructuralMaterials,CentralIron&SteelResearchInstitute,Beijing100081,Chinaarticleinfoabstra
3、ctArticlehistory:TheeffectofaddingdifferentcontentofCu(0wt.%,1.5wt.%and3wt.%)tothe15%CrsupermartensiticReceived30November2011stainlesssteel(SMSS)wasinvestigatedusingopticalmicroscope,scanningelectronmicroscope(SEM),Accepted18April2012transmissionelec
4、tronmicroscope(TEM)andX-raydiffraction(XRD).ItsconsequenceonmechanicalAvailableonline27April2012propertieswasexaminedtoclarifytheroleofCuinthetestedsteels.Theexperimentalresultsindicatethatthemicrostructuresofthreetestedsteelsaretemperedmartensite,re
5、tainedausteniteandreversedaustenite;twokindsofaustenitesaredispersedlydistributedamongmartensitematrix.CucansoluteinmatrixunderquenchingconditionandcanprecipitateasCu-richnanometerphase(e-Cu)duringtemper-ing.Cuishelpfulforthegrainrefinementandtopromot
6、etheformationofreversedausteniteduringtem-pering.Themaximumvolumefractionofausteniteis55.9%inthesteelwith3wt.%Cu,whichisresponsiblefortheimprovementofductility.Theresultsofthemechanicalpropertiestestsrevealthatthemechanicalpropertiesaresignificantlyin
7、fluencedbythevolumefractionofaustenite.Cucancausesolidsolutionstrengthening,precipitationstrengtheningandgrainrefinementstrengtheninginSMSS.Cualloyedsupermartensiticstainlesssteelexhibitsgreatlyimprovedmechanicalproperties.Ó2012ElsevierLtd.Allrightsres
8、erved.1.IntroductionMeanwhileitsprecipitatedphaseisinnanometersize,whichmightberesponsiblefortheincreaseofthestrengthandplasticityAttheendofthe1950s,theconceptofsupermartensiticstain-[8–11].Inaddition,Cucanalsoimprovethepropertiesofcorrosionlesssteel
