Ni含量對0Cr17Ni4Cu4Nb不銹鋼組織與性能的影響.pdf

1、重慶大學碩士學位論文Ni含量對0Cr17Ni4Cu4Nb不銹鋼組織與性能的影響姓名：王劍星申請學位級別：碩士專業(yè)：材料科學與工程指導教師：劉天模楊鋼201005重慶大學碩士學位論文英文摘要IIABSTRACTStainlesssteel0Cr17Ni4Cu4Nbwhichobtainstrengthmainlybytheprecipitationofcopperrichphaseisakindoftypicalprecipitation

2、hardenedstainlesssteel.Steels0Cr17Ni4Cu4NbofdifferentNicontentwereheatedwithdifferentquenchingcoolingspeeddifferentagingtemperaturedifferentagingcoolingspeed.TheeffectofNicontentonstructurepropertyofstainlesssteel0Cr17Ni

3、4Cu4NbwerestudiedthemechanismofNicontentonsteel0Cr17Ni4Cu4NbwasdissussedthroughthemechanicalpropertiestestingXraydiffractionanalysisingtheopticalmicroscopeSEMTEMobservationanalysising.TheresearchFocusontheinfluenceofNico

4、ntentonthecopperrichphaseresidualausteniteδferriteinsteel0Cr17Ni4Cu4Nb.Obtainedthefollowingconclusions:Copperisthemainelementofstainlesssteel0Cr17Ni4Cu4Nb.Largenumbersofcopperrichphases，whicharetinydistributingdispersedl

5、yareprecipitatedinsteelafteraging.Theytakestrongpinningactionondislocationthesmallerdispersiveroftheparticlesthestrongerofthepinningactinondislocation.Therehavearelativelystronginfluenceonthephasetransitiongwingprocessin

6、agingofcopperrichphasewiththeimprovingofNicontent.Itreducedtheprecipitationphasetransitiontemperatureofcopperrichphaseintheprocessofquenchingwasinfavoftheprecipitationofcopperrichphaseintheprocessofagingwiththeimprovingo

7、fNicontentwhichmakesstrengthincreased.ControllingNicontentinupperlimitissuggested.NiwhichcanreduceAsMsisastrongaustenitefmingelement.ItcanreducethecontentofδferriteinsteelwiththeimprovementofNicontent.Theagingtemperature

8、ofreversedaustenitetransitionedwhat’smeitobtainedmereversedausteniteinthesameagingtemperaturewiththeimprovementofNicontent.TherehavelittleeffectofNicontentcoolingmethodonthecontentofresidualausteniteinsteelswhichagedat46