焊接參數(shù)對16MnR鋼接頭低溫性能的影響及其安全評定.pdf

1、（類別：全日制碩士研究生題別：全日制碩士研究生題目：焊接參數(shù)對目：焊接參數(shù)對16MnR鋼接頭低溫性能的鋼接頭低溫性能的影響及其安全評定影響及其安全評定英文題目：英文題目：EffectsofWeldingParametersonCryogenicPropertiesofWeldedJointof16MnRSteelSafetyAssessment研究生：王晶研究生：王晶學科名稱：材料加工工程學科名稱：材料加工工程指導教師：董俊慧指導教師：

2、董俊慧教授教授二○○九年五月二○○九年五月碩士學位論文碩士學位論文分類號:學校代碼:10128類號:學校代碼:10128UDC:學號:20061295學號:20061295AbstractTheweldedstructureofthepressurevesselsareusedtobeaffectedbyweldingparameters，thedefectsexistinevitablyintheweldedjointincrease

3、thebrittlefracturetendency，easilyleadtobrittlefracture.Ontheotherh，thepressurevesselsduetotheimpactoflowtemperaturewillinevitablyincreasethesensitivityofweldedjointsdefectswhichtendtoincreasebrittleness，thesewillbeharmfu

4、ltothesafetyofpressurevessels.Atpresent，thesafetyassessmentofpressurevesselsbasedon“Fitnessfservice”principlehasbeenwidelydevelopedbothathomeabroad，manynewtheiesaredeveloped.Accdingly，manynewstardsareestablished，suchasSI

5、NTAPGBT196242004soon.Thefoundationof“Fitnessfservice”principleisthescientificmethodbasedonthetheyanalysistheexperimenttests.Itsubstitutedf“perfectwascomplete”methodbasedontheexperience，canobjectivelyguaranteethepressurev

6、esselwithoutanyknownmechanismexpirationaccidents.Inthisresearch，pressurevesselsteel16MnRwerecommonlyusedinourcountrythroughcarryingoutfcryogenicmechanicalpropertiestests：uniaxialtensiontest，impacttoughnesstestofthewelded

7、joint，fracturetoughnesstestweremadeat40℃.OMSEMwereemployedtoinvestigatethemicrostructurefracturesurfaceofweldedjoint.Itwasshowedthatthetensileproperties、impactpropertiesfracturetoughnessofAweldingparametersatlowtemperatu

8、rewerebetterthanB、C，whichmainlybecausethemicrostructureoftheHAZwerecoarsenonunifm，theemergenceoflargewidmanstattenstructure，inaddition，thefracturesurfaceclearlyshowedtheacteristicofcleavagefracture，whichmadethemechanical

9、propertiesofHAZatlowtemperaturedecreasemeobviouslythanweldmetal.Theresultsofcracktipopeningdisplacementtestsshowedthatthecrackresistanceof16MnRweldmetalwasmuchbetterthanthatoftheHAZ，whichprovedthatthe16MnRhadgoodcrackarr

10、estproperty.Thisresearchwasbasedontheprojectinvestigationrepeateddiscussion.TheChinesestard“Safetyassessmentfinservicepressurevesselscontainingdefect”(GBT196242004)wasedtoassessthesafetyofgirthsurfaceflawinweldmetalHAZof