304不锈钢激光焊接接头形貌与组织性能分析-(5278)

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1、addition,thetensiletestofjointsweldedunderdifferentprocessingparameterswereconducted,andthetensilepropertieswererelatedtothemacro-morphologyandmicrostructureofjoints.Whenthejointobtainstheappropriatemacro-dimensionsandfinegrainsinthefusionzone,itgetsthebesttensilepropertiesandfractur

2、esinthebasemetalaftertensiletest.Themorphologyoffracturesurfacewasexaminedviaascanningelectronmicroscope.Itisvisiblethatlargequantityofdimplesisformedonthefracturesurfaces,revealingthattheweldedjointfailsinaductilemode.Finally,accordingtothefeatureofweldshapeoflaserwelding,acombinedh

3、eatsourcemodelofdoubleellipsoidbodyheatsourceandgausssurfaceheatsourcewasestablished.ThedynamicsimulationoftemperaturedistributionoflaserweldingwasrealizedbyusingFEsoftwareABAQUSandtheusersubroutinewhichisintheFORTRANlanguage.Fromtheaspectofmacro-morphology,theweldingpoolboundaryinsi

4、mulationisinaccordancewiththefusionboundaryinexperiment,whichverifythereliabilityofmodel.Fromtheaspectofmicrostructure,thetemperaturedistributioncanpredictthetemperaturegradientofliquidandthecoolingrateofweldcenter,andfurtherpredictthetendencyofsolidificationmodeandtherelativesizeofg

5、rainsqualitatively.Sotherelationbetweenthetemperaturedistributionandmicrostructureofweldisstudied.Keywords:Laserwelding;Microstructure;Mechanicalproperty;Temperaturedistribution;FiniteelementsimulationIII万方数据目录中文摘要......................................................................

6、.................................................IAbstract.......................................................................................................................II目录.......................................................................................................

7、...................IV第1章绪论.................................................................................................................11.1研究背景.........................................................................................................11.2304不锈钢的传统焊接方法...............

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