简介:CausesforcentralshrinkpipeofGCr15bloomswereanalyzed.Countermeasurestotacklewithsuchdefectwerepracticed,includingsuitablesecondarycooling,softreductionandcastingspeed,aswellasstrictsuperheatcontrol.Theresultsshowthatthequalityofbloomcastingsissignificantlyimproved.
简介:AnovelsolidsolutionCe6MoO15wasachieved.Theirstructureandoxideionicconductivitywerestudied.BasedonCe6MoO15,rareearthelementsubstitutiononceriumsiteshowsthatallresultingoxidesenhancetheconductivityfurther,andhavehighoxide-ionconductivity,whichmaybeakindofpromisingmaterialforSOFCs.
简介:Martensiticstainlesssteelcontaining12%-18%Crhavehighhardnessduetohighcarboncontent.Thesesteelsarecommonutilizedinquenchingandtemperingprocessesforknifeandcutlerysteel.Thepropertiesobtainedinthesematerialsaresignificantlyinfluencedbymatrixcompositionafterheattreatment,especiallyasCrandCcontent.Comprehensiveconsideredthehardnessandcorrosionresistance,anewtypemartensiticstainlesssteel6Cr15MoVhasbeendeveloped.Thisstudyemphaticresearchestheeffectofheattreatmentprocessesonmicrostructureandmechanicalpropertiesof6Cr15MoVmartensiticstainlesssteel.Thermo-Calcsoftwarehasbeencarriedouttothermodynamiccalculation;opticalmicroscope(OM),scanningelectronicmicroscope(SEM)andtransmissionelectronmicroscope(TEM)havebeencarriedouttomicrostructureobservation;hardnessandimpacttoughnesstesthavebeencarriedouttoevaluatethemechanicalproperties.Resultsshowthattheequilibriumcarbidein6Cr15MoVsteelisM23,C6carbide,andfinelydistributedofM23C6carbidescanbeobservedonannealedmicrostructureof6Cr15MoVstainlesssteel.6Cr15MoVmartensiticstainlesssteelhasawiderquenchingtemperaturerange,thehardnessvalueofsteel6Cr15MoVcanreachto60.8-61.6HRCwhenquenchedat1060-1100℃.Finelydistributedcarbideswillexistinquenchedmicrostructure,andeffectivelyinhabitthegrowthofaustenitegrain.Withtheincreasingofquenchingtemperature,thevolumefractionofundissolvedcarbideswilldecrease.Theexcellentcomprehensivemechanicalpropertiescanbeobtainedbyquenchedat1060-1100℃withtemperedat100-150℃,anditismainlyduetothehighcarbonmartensiteandfinegrainsize.Atthesetemperatureranges,thehardnesswillretainabout59.2-61.6HRCandtheCharpyU-notchimpacttoughnesswillretainabout17.3-20J.Themorphologyofimpactfracturesurfaceoftestedsteelissmalldimpleswithasmallamountofcleavageplanes.Theareaofcleavageplanesincreaseswiththeincreas
简介:ControlNet网是新一代通讯控制网络,采用生产者/消费者网络通讯模式,遵照其实时性、确定性及重复性等的网络通讯特点,重新规划15万t/a铜控制系统控制网后,提高了网络的整体性能。