简介:ElectrodeENiFe-Cland£"4303wereselectedtojointhecementedcarbideWC-2QCoandcarbonsteel45byshieldedmetalarcweldingprocess.Microstructureandbendingpropertyofthecorrespondingjointswereanalyzed.Theresultsshowedthatthecarbonsteelelectrode£"4303hadnopropermetallurgyconditionforthearcweldingofcementedcarbideandcarbonsteel.TheCandNicontentofthecastironelectrodeENiFe-Clcouldmeettheconditionofpreventingtheformationof7]carbide,whichwassuittothearcweldingofcementedcarbideandcarbonsteel,buttheoperationparametersneededtobeoptimizedtominimizetheslaginclusion.ThealloyWC-2QCowhichdidnotfitforcoldarcwelding,byadoptingthemeasureofbeingpreheatedat723K/or1hbeforewelding,andbeingkeptat723Kfor3hafterweldingthenfollowedfurnacecoolingcouldavoidthehappeningofcrackintheWC-20C〇basemetal.
简介:Themorphology,structureanddistributionoftherareearthcompoundsintheYG8R.YT5RandYT14Rcementedcarbideswithadditionsoftracelightrareearthswerestudiedwithananalyticalelectronmicroscope.TheparticlesoftherareearthcompoundsinthesealloysareallsphericalanddistributeatinterfacesbetweentheCo-cementphaseandWChardphaseor(TiW)Csolidsolution,andinthe(TiW)Csolidsolution.IntheYG8RandYTI4Ralloys,therareearthcompoundisRE2O3withabccstructure,whileintheYT5Ralloy.therareearthcompoundisRE2O2Swithahcpstructure.
简介:Abiomimetichipjointsimulatorthatcanbeusedtoevaluatetheoutcomeofthecementedtotalhipreplacementhasbeendesigned,manufacturedandevaluated.Thesimulatorproducesmotionintheextension/flexionplane,withasockettorotateinternal/externally.Atthesametimeadynamicloadingcycleisapplied.Avalidationtestwasperformedonacementedfemoralstemwithinanovelcompositefemur.Thebonequalityhasastrongeffectonthestemmigrationandontheintegrityoftheinterfaces.Themigrationofthestemisacombinationof3-Dtranslationandrotationofthestem.Underthesameloadingconditions,weakboneallowsmorestemmigrationthanstrongbone.Thereisagreatdecreaseinthestrengthofthestem-cementinterfaceafterthedynamictest,andtheweakbonecompositeexhibitedagreaterreductionininterfacialstrengththanthestrongbonecomposite.Thedecreaseoftheinterfacialstrengthindicatesthattheprimarybondingbetweenthestemandthecementmantlehaddeterioratedandtheintegrityofstem-cementinterfacewasdamaged.Thestudydemonstratesthevalueofusingahipjointsimulatortoinvestigatestemmigrationandinterfaceintegritywithinthecementedhipreplacement,suggestingthatmethodcanbeusedforinvitroevaluationofthebiomaterialsusedinthecementedhipreplacements.
简介:Thetungsten-inert-gas(TIG)arcweldingexperimentsofcementedcarbideYG30andsteel45werecarriedoutusingtheNi-Fe-Cfillingalloys.Theetaphasesandmechanicalpropertiesofweldedjointswereanalyzedbymeansofscanningelectronicmicroscope(SEM),transmissionelectronicmicroscope(TEM)coupledwithselecteddiffraction,electronicprobemicroanalysisandbendingstrengthmethods.Theexperimentalresultsshowthatthechemicalcompositionofthefillingalloysaffectsetaphaseformation.Whenthecarbonandnickelcontentsinfillingalloysare0.61wt%and55.29wt%,respectively,noetaphasesform.Andthejointbendingstrengthisthehighestto1.352GPa.Butiftheyare0.01wt%and55.38wt%,theetaphasesareformedattheboundariesofthecementedcarbideandtheweld,andthethicknessofetaphaselayerisabout110micrometers.Andthejointbendingstrengthislow.Usually,theseetaphasesareanomalouslygranular,andeasytoaccumulateattheboundariesbetweencementedcarbidesandtheweld.TheyaremultipleM6Crichintungstenandiron.
简介:这份报纸在极其细小的颗粒的WC-12%Co合金的磁性、机械的性质上处理codopedVC/Cr3C2和sintering温度的效果。结果证明在最佳的比例的做的VC/Cr3C2的synergistic行动提高坚硬和合金的横向的破裂力量(TRS),与更多的同类的微观结构。当合金是在1430点的sintered时?C并且与0.5%Cr3C2/0.2%VC,TRS到达3786MPa,坚硬是91.7HRA和比0.6m小的谷物尺寸。谷物生长上的数字分析在sintering过程期间证明在WC谷物边界并且Cr3C2溶解在公司上猛抛的两VC分阶段执行减少固体/液体的界面的精力,溶解和降水的过程极大地被延迟,WC谷物变粗被禁止。