石墨含量对镍基高温合金在900℃氧化行为的影响

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XueMaoqtlaneta1./RareMetalMaterialsandEngineering,2009,38f7》:1146-1149
Thealloyblankswerefabricatedintothesampleswith10minx4minx4mill,whichweregroundwithemerypaperswashedinwater,alcoholandfinallydried.n屺oxidationdy.namicexperimentsofthealloyswereperformedinachamberfillrnac君at900oCfor100hinair.Afterbeingoxidizedforcertaintime(1,3,5,10,25,50,75and100h)thesamplesweretakenoutandweighedbyDT2100analyticalbalancewithallaccuracyof0.1mg.ThephaseconstitutiomweffganalyzedbyXRD.andthemorphologiesofthesamplecrosssectionswereobservedbvSEM.
vishnu2.IMorphologyandstructureofalloys
办六级成绩单Fig.1showsthemorphologiesandXRDpatternofthea
l-loysafterhotpressing.Thereareafewgrayblocksandblackdotimpurityphasesdispersedinthematrixofthealloywith
nographiteaddition.asshowninFig.1a.111egrayblocksandblackdotsincreasewiththeincreaseofgraphitecontent.XRDresultindicatesthatbesidessomeNi.basedsolutionandgraphite,thereareafewtungstencarbides,whichwereformedbytungstenandgraphitereaction.
2口/0
Fig.1Opticalphotographsofthealloyswithdifferentconten协ofgraphite(massfraction):(a)O%;(b)3%;(c)6%;and(d)XRD
patternofP/MproductsofNi-Cr-W-Cahoy2.2Oxidationdynamiccurve
Theoxidationdynamiccurvesofthealloyswithdifferentcontentsofgraphite(A=0%,B=3%,C=6%)(massfraction)at
900oCfor100harepresentedinFig.2.Ininitialperiodof10h,oxidationspeedsup.Thisistheformationperiodofoxidefilm.Then,theoxidationspeedsdown,andenterstheoxidefilmgrowthperiod,whichlastsfor20h.Duringtheoxidationprocess,asurfacereactionchangesintoditfusiongradually.Atthesanletemperature,themassgainofthealloywithaddi-tionof3%(massfraction)graphiteishigherthanthatofNi—C卜Walloy;however,themassgainofthealloywithaddi.tionof6%(massfraction)graphiteisthelowest.AccordingtothedynamicsCILrVe,theequationcanbewrittenasAm=af,whereAmisthemassgainandtistheoxidizationtime.Fromtheequation.t
heformulaofNi.Cr-Walloyat900oCisAm=0.27产”.Itcanbeconeludedthattheoxidedynamiccurveapproximatelyfollowscuberule,whichshowsthattheoxidesformedathightemperaturehavearestrainingeffectonoxidationprocess.Theformulaischangedintov=0.08广….throughaderivativetransformation.where’,istheoxidationvelocity.TheformulaofsampleBandCat900oCisAm=O.36to·30andAm=0.16to·26respectively.111eformulaischangedintov=0.1l,一andv=0.04r0。74respectively,throughaderivativetransformation.Itcanbeconcludedthatoxidationspeedsdownwithprolongingof。thetime.notatall什么意思
2.3Constitufionofoxidationfilm
Fig.3showstheSEMimagesofthesampleswithdifferentcontentsofgraphite(A=0%,B=3%,C=6%)(massfraction)at900oCafterlOOhoxidation.Fig.4showsX
.raydiffractionresultsforthesurfaceofthesamplesafteroxidation.Itcanbeseenthattheredenseoxidationfilmsonthesurfacewith-outgraphite.TheoxidesonthesurfaceconsistofCr203andNiCr204spinelle.、Ⅳitll3%(massfraction)contentofgraphite.theoxidegrainsonthesurfacebecomelargerandmorepro-truded。themaincomponentoftheoxidationfilmisCr203,andoxidationmassgainishigherthanthatofsampleA,
Fig.2OxidationkineticsofNi-basedalloysinairat900。Cforlooh
XueMaoquanetaL/RareMetalMateriabandEngineering,2009,38(7》:1146-jH9
Fig.3SEMimagesofsamplesoxidizedfor100hat900o
C:(a)Ni-Cr-W-0%C;(”Ni-Cr-W-3%C;and(c)Ni—Cr-W-6%C
2占的2护/02口/0
Fig.4XRDpatternsofsamplesafteroxidationforl00hat900℃:(a)Ni-Cr;(”Ni-Cr-W-3%C;and(c)Ni·Cr-W-6%C
嬲showninFig.2.Whenthealloywith6%(massfraction)contentofgraphite,theoxidesflakeaway,resultinginthema-trixoxidizedfurther;thereareonlyafewoxidesonthesurfaceinsteadofcontinuousoxidefilms.whichmeansthatthealloyhasnoabilityofoxidationresistance.IneachsamplethereiS’,
phase(n/ckelbasesolidsolution);thisisbecausetheoxidesthicknesswaslimitedintheoxidationprocess.X-raypenetra-tiondepthislarge,thuspene
trateoxidelayer,andshowsthephaseconstitutionofthesubstratematerial.
TheadditionofWpromotesstrengtheningofthesolidSOll卜tion,raisingrecrystallizationtemperatureofthematrixandreducingthediffusionrateofatomsinthematrix.Somere-searchindicatedthataselecfiveoxidationfornickel..baseda1..10ywilloccurwhenthecontentofactivelivelyelementchro-
miuminthenickel.basedalloyexceedsacriticalconcentration,resultingintheformationofsingleCr203oxidelaye一“.Theoxidationofgraphiteinthealloywilloccurathilghtempera-ture,andpartofitbecomesgaswhichescapes,resultingintheformationofthecavityintheoxidefilm.Metaltransporting
outwardwilltakeplacethroughoxidefilmandcavit
yinnextoxidationprocess;alongwiththeoxidation,thecurveofoxidefilmwillexacerbate【l,j,andtheoxidesheddinghappenswhen
thecurveofoxidereachesacertaindegree.UponthelOWercontent
ofgraphite,theoxidationsofgraphiteandmetalma·trixtakeplacesimultaneouslyinoxidationprocess;however,theoxidationmassgainsignificantlyexceedsthegasescape.Theeffectofgraphiteoxidationontheoxidationresistanceofalloysincreaseswithincreasingofgraphitecontent.
11ThegraphitecontentofNi·Cr-basedalloyhasthere—markableinfluenceontheoxidationresistanceandoxidationmechanismat900oC.
2)nleisothermaloxidationkineticsofthealloyco
ntainingvariouscontentsofgraphiteobeystheparaboliclawat900℃.
3)Withoutgraphite,thedenseoxidationfilmofNi—Cr-basedalloyconsistsofspinelstructureNiCr204andCr203,andtheoxidationrateofthealloyisreduced.Withtheaddi.tionofgraphite,alooseCr203filmoncompositesurfacewillbeformed,andtheoxidationrateincreases.
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石墨含量对镍基高温合金在900 ℃氧化行为的影响
作者:薛茂权, Xue Maoquan
作者单位:常州轻工职业技术学院,江苏,常州,213164
刊名:
稀有金属材料与工程
英文刊名:RARE METAL MATERIALS AND ENGINEERING
惊讶的拼音年,卷(期):2009,38(7)
被引用次数:1次
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