液压剪活塞杆表面堆焊的研究

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1、山东大学硕士学位论文StudyontheHardfacingcoatingoftheHydt:。ulicShearingMachingPistonRodABSTRACTInthispaper,themicrostructure,phasestructureandwearresistantpropertieso「thepistonrodhardfacingcoatingwereinvestigatedbymeansofscanningelectronmicroscopy(SEM),X一raydiffraction(XRD1electrondiffraction

2、X一rayanalysis(EDAX)andmetallograph.cmicroscope,aswellaswearingtesting.Thehardfacingmaterialswerechosenbyoptimizationmethod.Theeffectofhardfacingtechnologyandthetemperingtemperatureonthemicrostructureandmechanicalpropertiesofhardfacingcoatingswerealsoanalyzed.Theeffectfactorsonthewe

3、arresistanceandwearmechanismwerediscussedbymeasuringwearresistanceandobservingwornscarofthehardfacingcoatingsTheresultsindicatethatthewearresistanceandcrackresistantpropertyofhardfacingcoatingobtainedbytheD226flux一coredwirewith川260isbetterthanthatoftheJL9401flux一coredwirewith川260Th

4、erefore,theD226flux一coredwireismoresuitabletohardfacethepistonrod.Themicrostructureandwearpropertiesofthehardfacingcoatingswereinfluencedobviouslybytheweldingtechnologyparametersandtemperingtemperature.Whenweldingparametersare1=400A,U=30V.wireextentionisfrom20mmto30mm,weldingwiresl

5、opeisfrom5to80andinterpasstemperatureisfrom100'Cto2000C,aswellasthetemperingtemperatureis450℃，thehardfacingcoatingpossesseshigheriV山东大学硕士学位论文carbide,thehardfacinglayershavethebestabrasionresistanc,Thereexistsfragmentationandsheddingofcarbideandthebasicmaterialsformingfurrows.Hardfa

6、cingcoldcrackscanbeeasilypreventedfrompreheatingbeforehardfacing,heattreatmentafterhardfacing,strictlycontrollingthetemperaturebetweenthelayers.Accordingtotheresultsofapplicationautomaticsubmergedarc一weldingisbetterhardeningprocessinthepistonrodsurfacetousethe226flux一coredwireandHJ

7、260weldingflux，thelifeofhardfacingpistonrodadoptingautomaticsubmergedare一weldingismore2.6timesthatofelectro一platingone.KEYWORDS:Flux一coredwireHardfacingWearv原创性声明本1郑重声明:所呈交的学位论文，是本人在导师的指导卜，独立进行研究所取得的成果。除文中己经注明引用的内容外，本论文不包含任何其他个人或集体已经发表或撰写过的科研成果。对木文的研究作出重要贡献的个人和集体，均已在文中以明确方式标明。木声明的法

8、律责任由本人承担。论文作者签名:季准璐日期:二、10