简介:Themicrostructuralevolutionsofadvanced9-12%Crferrite/martensiteheat-resistantsteelsusedforpowergenerationplantsarereviewedinthisarticle.Despiteofthesmalldifferencesinchemicalcompositions,thesteelssharethesamemicrostructureoftheas-temperedmartensite.Itisthethermalstabilityoftheinitialmicrostructurethatmattersthecreepbehavioroftheseheat-resistantsteels.Themicrostructuralevolutionsinvolvedin9-12%Crferriteheat-resistantsteelsareelabo-rated,including(1)martensiticlathwidening,(2)disappearanceofprioraustenitegrainboundary,(3)emergenceofsubgrains,(4)coarseningofprecipitates,and(5)formationofnewprecipitates,suchasLaves-phaseandZ-phase.Theformerthreemicrostructuralevolutionscouldberetardedbyproperlydisposingthelattertwo.Namelyimprovingthestabilityofprecipitatesandoptimizingtheirsizedistributioncaneffectivelyexertthebeneficialinfluenceofprecipitatesonmicrostructures.Inthissense,themicrostructuralstabilityofthetemperedmartensiteisinfactthestabilityofprecipitatesduringthecreep.Manyattemptshavebeencarriedouttoimprovethemicrostructuralstabilityof9-12%Crsteelsandseveralpromisingheat-resistantsteelshavebeendeveloped.
简介:Usingdirectfinitedifferencemethod,anumericalmodelforsimulatingthetemperaturefieldinthechargeduringinductionskullmelting(ISM)hasbeendeveloped.Onthebasisofthemodel,thetemperaturefieldinTi-47Ni-9Nbingothasbeencalculatedundervariousmeltingconditions.Finally,theprocessingparameters(meltingpower,melting-downtimeandthefinalmelttemperature)havebeenoptimized.
简介:7月31日,工信部对2018年智能制造试点示范项目进行公示,共有99个项目入选,公示时间为7月31日至8月29日。9个石油化工类项目名列其中。入选的石油化工项目有:内蒙古中煤蒙大新能源化工有限公司煤化工智能工厂试点示范、中国石化上海石油化工股份有限公司石化智能工厂试点示范、浙江新安化工集团股份有限公司有机硅材料智能制造试点示范、中盐安徽红四方股份有限公司化肥智能工厂试点示范、安徽国星生物化学有限公司精细化工智能工厂试点示范、山东海科化工集团有限公司炼油智能工厂试点示范、嘉宝莉化工集团股份有限公司涂料智能工厂试点示范、中国石油天然气股份有限公司长庆石化分公司炼化智能工厂试点示范、兰州兰石集团有限公司石油装备智能制造试点示范。
简介:三新奇Ba_5RNiNb_9O_(30)(R=La,Nd和Sm)陶艺在BaO-R_2O_3-NiO-Nb_2O_5系统被准备并且描绘。所有三混合物areparaelectjicphasesadopting。在房间温度的充满的四角形的钨铜(TB)结构。在1MHz,Ba_5RNiNb_9O_(30)陶艺有高电介质在范围193-245.3,在范围0.0059-0.0087的低绝缘的损失,和在范围的绝缘的常数(tau_e)的温度系数的常数-1140-1310X10~(-6)中心点degC。他们绝缘的常数的温度系数显著地Ba_5RNiNb_9O_(30)与那些相比被减少(R=La,Nd,Sm)陶艺。
简介:TheatomicscalecomputersimulationforinitialprecipitationmechanismofNi75Al6V19alloywascarriedoutforthefirsttimebyemployingthemicroscopicdiffusionequation.Theinitialprecipitationprocesswasinvestigatedthroughsimulatingtheatomicpicturesandcalculatingtheorderparametersofthetwokindsoforderedphases.Simulationresultsshowthattheγ′orderedphaseprecipitatedearlierthanθorderedphasebycongruentordering+spinodaldecompositionmechanismandthusproducedanonstoicheometricγ′singleorderedphase.Then,thenonstoichiometricθphaseprecipitatedbyanon-classicalnucleationandgrowthmechanismattheAPBSofγ′phase.
简介:采用Sol—gel法合成了BaTiO3、BaTi2O5和BaTi2O9粉末,利用XRD和SEM研究了它们的晶相和微观结构。在较低温度烧结得到的粉末都存在一定量的杂相,随着烧结温度的升高,杂相逐渐消失。在1000℃以上温度烧结,可以得到单相BaTiO3和BaTi2慨粉末,而单相BaTi09粉末则在1300℃以上温度烧结得到。随着n(Ba)/n(Ti)减小,所得单相的烧结温度逐渐升高。随着烧结温度的升高,BaTiO3、BaTi2O5和BaTi4O9粉末的晶粒逐渐长大。800℃以上温度烧结得到的四方BaT[03钙钛矿相粉末主要由方形和圆形的晶粒组成;1100℃烧结得到的单斜BaTiO5相粉末主要由近似菱形的晶粒组成;在1200℃烧结得到的正交BaTi4O9相粉末基本由长形的晶粒组成。
简介:Anovelfluorescentprobe9-(4-(1,2-diamine)benzene-N1-phenyl)acridine(DABPA)wassynthesizedforthedetectionofnitricoxide(NO)andcharacterizedbyIR,1H-NMRandEI-MSspectroscopy.Basedonaphotoelectrontransfermechanism,thefluorescenceintensitiesofDABPAwereinvestigatedwiththedifferentconcentrationsofNO.Undertheoptimalexperimentalconditions,thefluorescenceintensityofDABPAhadagoodlinearrelationship(R2=0.9977)withNOconcentrationintherangefrom1×10-7to1.5×10-6mol/Lwithadetectionlimitof1×10-8mol/L.ThecytotoxicityinducedbyDABPAwasevaluatedbytheMTT(3-(4,5-dimethylthiazol-2-yl)-2,5diphenyltetrazoliumbromide)assayforbiologicalapplication.Furthermore,theprobeDABPAhadalsobeensuccessfullyappliedtoreal-timeimageNOproducedinPC12cellsinthepresenceofL-arginine.