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1、第29卷第2期材料科学与工程学报总第130期Vol129No12JournalofMaterialsScience&EngineeringApr.2011文章编号:1673-2812(2011)02-0167-06合金成分对镍基合金激光熔覆涂层组织与性能的影响1,2122董刚,严彪,邓琦林,余廷(1.同济大学材料科学与工程学院,上海200092;2.上海交通大学机械与动力工程学院,上海200030)=摘要>为了研究激光熔覆镍基合金涂层显微组织与性能之间的关系,本文选用Ni25、Ni45、Ni60镍基自熔性合金粉末作为熔覆材料
2、,在同一工艺参数下在45#钢基体上制得Ni25、Ni45、Ni60合金激光熔覆涂层。利用扫描电子显微镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)、显微硬度计等方法对涂层的显微组织、物相组成、显微硬度等进行了研究。结果表明从Ni25到Ni60合金涂层,随着合金元素含量的提高,涂层微观组织逐渐由亚共晶转变为过共晶,C-Ni奥氏体枝晶所占体积分数减少,尺寸细化,枝晶间的共晶组织和硬质相所占的体积分数增大,涂层和基体之间结合带的宽度越来越窄,熔覆层的显微硬度越来越高。Ni25、Ni45合金涂层的平均显微硬度分别为250HV
3、和550HV左右,而Ni60合金涂层的平均硬度却高达750HV左右,为Ni25合金涂层的3倍。=关键词>激光熔覆;镍基合金;涂层;结合带;显微硬度中图分类号:TG174.44文献标识码: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
