AZ31B镁合金熔化极气体保护焊焊缝的组织和力学性能（英文）.pdf

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1、Availableonlineatwww．sciencedirect．cornTransacdonsof·：j，ScienceDirectNonferrousMetalsSocietyofChinaTrans．NonferrousMet．Soc．China22(2012)1336—1341wWW．tnmsc．cnMicrostructureandmechanicalpropertiesofAZ31BmagnesiumalloygasmetalarcweldDONGHong—gang2LIAOChuan—qing，YANGL

2、i．qun1．StateKeyLaboratoryofAdvancedWeldingandJoining，HarbinInstituteofTechnology,Harbin150001，China；2．SchoolofMaterialsScienceandEngineering，DalianUniversityofTechnology,Dalian116085，ChinaReceived25May2011；accepted22August2011Abstract：Wroughtmagnesiumalloysheetswe

3、rebuttweldedwithgasmetalarcweldingprocess．Poresintbeweldwereinvestigatedunderdifferentweldingparameters，thecausesofporeformationweresystematicallydisposed，andtheefectsofporosityonthemicrostmctureandmechanicalpropertiesoftheiointwereanalyzed．Themicrostructureexamin

4、ationshowsthattheporesmainlyappearclosetothetoporbottompartoftheweld，andcouldconnecttoeachotherandleadtotheformationofcracksinthewelds．However,theporescanbecontrolledwithproperweldingparameters．Thetensiletestingresultsrevealthattheaverageiointstrengthisclosetoorhi

5、gherthanthatofthebasemeta1．Themicrohardnessintheweldcanbeevenhigherthanthatinthebasemetalduetothesecondphasestrengtheningoffl-Mg17(A1．Zn)12formedintheweld．Kevwords：Mgalloy；gasmetalarcwelding；porosity：microstmcture；secondphasestrengtheningdecreaseofsurfacetensionpr

6、essure．LIUeta1『911Intr0ducti0nstudiedtheporeformationduringhybridlaser-tungsteninertgasweldingofAZ31BmagnesiumalloyandfoundMagnesiumandmagnesmmalloyshavelowtheinertgasprotectionoflaserbeamcouldbedensity,highspecificstrengthandstiffness，highefectivelyimprovedbyappe

7、ndinglateralshieldinggasdampingcapacity,goodcastabilityandgoodforlaserbeamandtheamountofporescouldbeelectromagneticinterfereshieldingcapacity[1，2】．significantlyreduced．WUetal[10】investigatedtheTherefore，magnesiumalloysareconsideredoneoftheeffectsofhydrogen1evelson

8、theporosityandmostpotentialengineeringmaterialsinthetwenty—firstmechanicalpropertiesofAZ9lmagnesiumalloycenturytoreplacesteelandaluminumalloysinmanycast