简介：Thesurfacecoatingofgrindingballswasinvestigatedexperimentally.TheresultsshowthatacoatingmayformonthesurfaceofgrindingballswhenCrorAlpowdersaresubjectedtoballgrinding.Theplasticdeformationoftheballsurfaceplaysanimportantroleduringthecoatingformation,andthestrongbindingforcebetweenthepowdersandtheballsisanecessarypre-condition.Thethicknessofcoatingincreaseswiththeplasticityofthepowdersandtheballs.Annealingtheballswithcoatingwillresultinanobviousdiffusionoftheelementsinthebondingzoneofinter-face.

简介：YAGlaserweldingwithsurfaceactivatingfluxhasbeeninvestigated,andtheinfluencingfactorsandmechanismarediscussed.TheresultsshowthatbothsurfaceactivatingfluxandsurfaceactiveelementShavefantasticeffectsontheYAGlaserweldshape,thatistoobviouslyincreasetheweldpenetrationandD/Wratioinvariousweldingconditions.Themechanismisthoughttobethechangeofweldpoolsurfacetensiontemperaturecoefficient,thus,thechangeoffluidflowpatterninweldpoolduetotheflux.

简介：Toimprovewearresistanceofsurfacewillincreasetheservicelifeofgraycastirondirectly.ThispaperpresentsthatgraycastironsurfacecoatedwithalloypowderislocallyremeltedbyTIGarctoincreasethewearresistance.Theinfluencesofarccurrentandscanningrateetconsurfacepropertiesarefound.Underdifferentconditions,themicrostructure,hardnessandwearresistanceofremeltedlayerareanalyzedandmeasured.TheresultsindicatethatthegraycastironsurfacecanbestrengthenedbyTIGarclocalremeltingtreatment.Especially,surfacealloyinghardeningeffectisbestandsurfacepropertiesareimprovedremarkably.

简介：ＥｌｅｃｔｒｏｄｅＰｒｏｃｅｓｓｏｆＹ（Ⅲ）ｏｎＮｉｃｋｅｌＥｌｅｃｔｒｏｄｅａｎｄＳｕｒｆａｃｅＭｅｔａｌｌｉｚｉｎｇＺｈｏｕＣｈｕｎｇｅｎ（周春根）（ＵｎｉｖｅｒｓｉｔｙｏｆＡｅｒｏｎａｕｔｉｃｓａｎｄＡｓｔｒｏｎａｕｔｉｃｓＢｅｉｊｉｎｇ，Ｂｅ...

简介：Agroupofprojectionweldingexperimentsandjointstension-sheartestsarecarriedoutforcold-rolledsteelsheets,galvanizedsteelsheets(GSS)withouttreatment,GSSwithphosphatingandGSSwithsurfacegreasing,respectively.Theexperimentalresultsareregressivelyanalyzedonthecomputers,thentheprojectionweldedjointtension-shearstrengthcurveandtheperfectweldingcurrentsrangeofeachmaterialareobtained.Theresultsshowthatsurfacetreatmentsofgalvanizedsteelshaveeffectsontheirspotweldabilities.Amongthefourkindsofmaterials,GSSwithsurfacegreasinghavetheworstspotweldability,fortheyneedhigherweldingcurrentandhaveanarrowweldingcurrentrange.

简介：Fordifferentstrengthmatching,thereliabilityindexandfailureprobabilityofweldedpressurepipewithcircumferentialsurfacecrackwerecalculatedusingthreedimensionalstochasticfiniteelementmethod.Thismethodhasovercometheshortcomingsofconservativeresultsinsafetyassessmentwithdeterministicfracturemechanicsmethod.Theeffectsofexternalmomentandthedepthofthecircumferentialsurfacecrack(a)onthereliabilityofpressurepipewerealsocalculatedanddiscussed.Thecalculationresultsindicatethatthestrengthmatchinghascertaineffectonthereliabilityoftheweldedpressurepipewithcircumferentialsurfacecrack.Thefailureprobabilityofweldedpressurepipewithhighstrengthmatchingislowerthanthatwithlowstrengthmatchingatthesameconditions.Theeffectsofstrengthmatchingonthefailureprobabilityandreliabilityindexincreasedbyaddingexternalmoment(M)andthedepthofthecircumferentialsurfacecrack(a).

简介：在这篇文章，有关表面和界面的紧张的试验性的大小跟随简短介绍，为为二进制代码计算表面紧张和表面分离的方法，第三，并且多部件高温度基于蝇绳融化“soriginal处理并且在可得到的物理性质和热力学的数据上，特别体积阶段和表面阶段对温度的免费精力从热力学的数据库获得了使用相图(CALPHAD)的计算的excessGibbs来临，与到模型参数β的特殊注意，被描述了。另外，几何模型能被扩大预言表面紧张多亚二进制代码系统的从那些的部件系统。在nanoparticle系统的二元合金的Forillustration，一些计算例子，包括的Pb免费的焊接系统和phase-diagramevaluation被给。根据紧张ofhigh温度融化的表面，在象moltens一样的液体合金和熔融的炉渣之间的界面的紧张落后，熔融的物质能用Girifalco好的方程是计算的。修正在Nishizawa被建议“为在液体金属(A)/ceramics(MX)的界面的紧张的评价的s模型系统以便计算能基于潜水艇晶格模型和热力学的数据被执行，没有故意在高温度区分MX的阶段。最后，为预言在thehigh温度多部件之间的界面的紧张的一个近似表达式的推导融化，雇用贝克尔“与蝇绳一起的s模型”sequation和简单系统的界面的紧张数据被描述，并且有关焦性没食子酸的一些例子冶金系统为更好理解被给。

简介：TheelectrochemicalbehaviorofCu-Zn-Alshapememoryalloy(SMA)withandwithoutelectrolessplatedNi-PwasinvestigatedbyelectrochemicalmethodsinartificialTyrode'ssolution.TheresultsshowedthatCu-Zn-AlSMAengendereddezincificationcorrosioninTyrode'ssolution.TheanodicactivecurrentdensitiesaswellaselectrochemicaldissolutionsensitivityoftheelectrolessplatedNi-PCu-Zn-AlSMAincreasedwithNaClconcentrationrising,pHofsolutiondecreasingandenvironmentaltemperatureuprising.X-raydiffractionanalysisindicatedthataftersurfacemodificationbyelectrolessplatedNi-P,anamorphousplatedfilmformedonthesurfaceofCu-Zn-AlSMA.ThisfilmcaneffectivelyisolatematrixmetalfromcorrosionmediaandsignificantlyimprovetheelectrochemicalpropertyofCu-Zn-AlSMAinartificialTyrode'ssolution.