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321奥氏体不锈钢管焊接后真空去应力工艺研究.docx

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321奥氏体不锈钢管焊接后真空去应力工艺研究 Abstract Thestudyaimedtoinvestigatethevacuumstressreliefprocessofwelded321austeniticstainlesssteelpipes.Thestudyevaluatedtheprocessofwelding321austeniticstainlesssteelpipes,identifiedthepotentialrisksassociatedwithpost-weldstress,andexaminedtheeffectivenessofvacuumstressrelief.Theresultsindicatedthatpre-weldpreparationcanreducetheriskofpost-weldstressin321austeniticstainlesssteelpipes.Furthermore,vacuumstressreliefwasobservedtobeaneffectivetechniquetoreducepost-weldstress. Introduction 321austeniticstainlesssteeliscommonlyusedinvariousindustriesduetoitsexcellenthigh-temperaturepropertiesandcorrosionresistance.Theweldingprocessof321stainlesssteelhaschallengedengineersandfabricatorsduetothepotentialrisksassociatedwithpost-weldstress.Post-weldstresscanleadtocracking,warping,anddistortion.Theseissuescancompromisethemechanicalpropertiesofthepipes,makingthemunsuitableforuseincriticalapplications.Therefore,stressreliefprocesseshavebeendevelopedtoreducepost-weldstressin321stainlesssteelpipes. Vacuumstressreliefisastressrelieftechniquethatinvolvesheatingtheweldedmaterialinavacuumenvironment.Theprocesshasbeenreportedtobeeffectiveinreducingpost-weldstressinothermaterials.However,itseffectivenessinreducingstressin321stainlesssteelpipesisunknown.Thisstudyaimedtoinvestigatethevacuumstressreliefprocessofwelded321austeniticstainlesssteelpipes. ExperimentalProcedures Thestudyinvolvedwelding321austeniticstainlesssteelpipeswithathicknessof2mm.Theweldingprocesswasperformedusingthegastungstenarcwelding(GTAW)technique.Theweldingparametersusedwereasfollows:currentof80-100A,voltageof12-15V,andweldingspeedof5-8cm/min.Afterwelding,thepipeswereannealedfor1houratatemperatureof1000°C. Thevacuumstressreliefprocesswasperformedusingavacuumchamber.Theweldedpipeswereplacedinthechamberandheatedtoatemperatureof650°Cfor1hour.Thechamberwasthengraduallycooledtoroomtemperatureoveraperiodof6hours. ThesampleswereevaluatedfortheirresidualstressusingX-raydiffractionanalysis.Themicrostru