X52钢焊接接头组织与性能的分析

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1、ABSTRACTInrecentyears,X52pipelinesteeliswidelyusedintransportingoilandgas.Lowproductivityisthemainproblemofthepipelineintheproductionprocess.Thekeytosolvingthisproblemistostudythereasonsforcracksorfractureintheweldedjointsandunderstandtherelationshipbetwe

2、entheweldingprocessandthemicrostructureandpropertiesofweldedjoints.ThispaperinvestigatesthemicrostructureandpropertychangesofX52pipelinesteelweldedjointsbythemeansofcarbondioxidegasweldingprocessunderdifferentweldingrate.Theresultsshowthatundertheweldingr

3、ateof45,55,60and65cm/min,fractureareaofthesampleappearsinweldedjointsandthewidmanstattenstructureappearsintheCoarseGrainHeatAffectedZone(CGHAZ).Theoptimizedsurfaceoftheweldedjointappearsundertherateof45cm/min,atwhichratetheductilefractureisthemainfailurem

4、odeofweldedjointsinthestretchingprocessleadingtothebestmechanicalproperties,whichcanensurecontinuousproductionandimproveproductionefficiency.Inaddition,duringtheprocessofweldingX52pipelinesteel,thecopperpadwillbestuckwiththeweldmentwhichreducedthemechanic

5、alpropertiesofweldedjoints.Intheactualproductionprocess,theflatnessofsteelwasinbadconditionsandthegapbetweenthesteelplateswasnoteasilycontrolled.Therefore,weshouldensuretheflatnessofplateandcontrolproceduretoavoidtheoccuranceofnon-fusion.Keywords:X52steel

6、;weldingspeed;microstructure;mechanicalproperty目录第一章绪论..................................................................................................................11.1国内外管线钢的研究背景及发展历程..........................................................11.1.1国外管

7、线钢的主要发展历程...............................................................11.1.2管线钢在国内的发展历程...................................................................31.2管线钢的分类.........................................................................................

8、.........41.2.1铁素体-珠光体管线钢.........................................................................51.2.2针状铁素体管线钢...............................................................................51.2.3贝氏体-马氏体管线钢........