焊接參數(shù)對(duì)16MnR鋼接頭低溫性能的影響及其安全評(píng)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(duì)目：焊接參數(shù)對(duì)16MnR鋼接頭低溫性能的鋼接頭低溫性能的影響及其安全評(píng)定影響及其安全評(píng)定英文題目：英文題目：EffectsofWeldingParametersonCryogenicPropertiesofWeldedJointof16MnRSteelSafetyAssessment研究生：王晶研究生：王晶學(xué)科名稱：材料加工工程學(xué)科名稱：材料加工工程指導(dǎo)教師：董俊慧指導(dǎo)教師：

2、董俊慧教授教授二○○九年五月二○○九年五月碩士學(xué)位論文碩士學(xué)位論文分類號(hào):學(xué)校代碼:10128類號(hào):學(xué)校代碼:10128UDC:學(xué)號(hào):20061295學(xué)號(hào):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