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1、第29卷第2期材料科學(xué)與工程學(xué)報(bào)總第130期Vol129No12JournalofMaterialsScience&EngineeringApr.2011文章編號:1673-2812(2011)02-0167-06合金成分對鎳基合金激光熔覆涂層組織與性能的影響1,2122董剛,嚴(yán)彪,鄧琦林,余廷(1.同濟(jì)大學(xué)材料科學(xué)與工程學(xué)院,上海200092;2.上海交通大學(xué)機(jī)械與動力工程學(xué)院,上海200030)=摘要>為了研究激光熔覆鎳基合金涂層顯微組織與性能之間的關(guān)系,本文選用Ni25、Ni45、Ni60鎳基自熔性合金粉末作為熔覆材料
2、,在同一工藝參數(shù)下在45#鋼基體上制得Ni25、Ni45、Ni60合金激光熔覆涂層。利用掃描電子顯微鏡(SEM)、能譜儀(EDS)、X射線衍射儀(XRD)、顯微硬度計(jì)等方法對涂層的顯微組織、物相組成、顯微硬度等進(jìn)行了研究。結(jié)果表明從Ni25到Ni60合金涂層,隨著合金元素含量的提高,涂層微觀組織逐漸由亞共晶轉(zhuǎn)變?yōu)檫^共晶,C-Ni奧氏體枝晶所占體積分?jǐn)?shù)減少,尺寸細(xì)化,枝晶間的共晶組織和硬質(zhì)相所占的體積分?jǐn)?shù)增大,涂層和基體之間結(jié)合帶的寬度越來越窄,熔覆層的顯微硬度越來越高。Ni25、Ni45合金涂層的平均顯微硬度分別為250HV
3、和550HV左右,而Ni60合金涂層的平均硬度卻高達(dá)750HV左右,為Ni25合金涂層的3倍。=關(guān)鍵詞>激光熔覆;鎳基合金;涂層;結(jié)合帶;顯微硬度中圖分類號:TG174.44文獻(xiàn)標(biāo)識碼:AEffectsoftheAlloyCompositionontheMicrostructureandPropertiesofLaserCladdingN-ibasedAlloyCoatings1,2122DONGGang,YANBiao,DENGQ-ilin,YUTing(1.SchoolofMaterialsScienceandEngin
4、eering,TongjiUniversity,Shanghai200092,China;2.SchoolofMechanicalandPowerEngineering,ShanghaiJiaotongUniversity,Shanghai200030,China)=Abstract>InordertostudytherelationshipbetweenthemicrostructureandpropertiesofthelasercladdingN-ibasedalloycoatings,Ni25,Ni45,Ni60al
5、loycoatingswerefabricatedonthesubstrateof45#steelbylasercladdingofthecorrespondingN-ibasedself-fluxingalloypowdersatthesameprocessparameters.Themicrostructure,phasecompositionandmicrohardnesshavebeenanalyzedbythescanningelectronmicroscopy(SEM),X-raydiffractometry(X
6、RD),energydispersiveX-rayspectroscopy(EDS)andmicrohardnessmeaurement,respectively.Theresultsshowthatwithincreasingalloyingelementcontents,themicrostructureofcoatingschangesfromthehypoeutectictohypereutecticstructure,thevolumefractionandthesizeofC-Niaustenitedendrit
7、esandthewidthofbondingzonebetweenthecoatingandsubstratedecrease,butthevolumefractionoftheinterdendriticeutecticsandhardphasesandthemicrohardnessofthecoatingsincreasefromthelasercladdingNi25toNi60alloycoatings.TheaveragemicrohardnessofthelasercladdingNi25,Ni45alloyc
8、oatingsareabout250HVand550HV,respectively.However,theaveragemicrohardnessoftheNi60alloycoatingisaboutupto750HV.ItisthreetimesthatoftheNi25alloyco
