Title of article
Effectofagingat700°ConprecipitationandtoughnessofAISI321andAISI347austeniticstainlesssteelweldsOriginalResearchArticle
Author/Authors
KaishuGuan، نويسنده , , XiaodongXu، نويسنده , , HONGXU XIA، نويسنده , , ZhiwenWang، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2005
Pages
10
From page
2485
To page
2494
Abstract
AdetailedknowledgeofchangesinmicrostructuresandmechanicalbehaviourthatoccurinausteniticstainlesssteelswithorwithoutNb/Ti-stabilizedweldduringheattreatmentisofgreatinterest,sincetheductilityandtoughnessofthematerialmaychangedrasticallyafterlongagingtimes.Twokindsofmaterials,i.e.AISI321baseandwithoutTi-stabilizedweldsteelandAISI347basewithNb-stabilizedweldsteel,werecomparedduringagingat700°Cupto6000h.Bothmaterialspresentincreasedamountofprecipitateanddecreasedimpactenergyastheagingtimeincreases.Thedecreasedextentofimpactenergywithagingisalmostthesameforbothbasematerials.However,itpresentsdifferencesfor347and321weldsamples.Thelattershowsamoredrasticdecreaseofimpactenergythantheformerduetothedifferentamountofprecipitates.321weldsampleprecipitatesmorenumerouslythan347weldsampleduetotheabsenceofstabilizedTi/Nbontheformer.Largeamountofcarbidesisformedon321weldsampleimmediatelyafterwelding.Thecarbidesaretransformedtosigmaphase,whichismainlyresponsibleforthemuchmoresigmaphaseprecipitationcomparedwithothersamples,afterhigh-temperatureaging.Thefractographsshowed,ingeneral,brittlefracturemodein321weldimpact-fracturedspecimensafteragingat700°Cfor6000h.However,othersamplesshowductilefracturemodeingeneral.Severalapproachesshouldbeemployedtocontrolsigmaphaseprecipitationinweldmaterial.Theseapproachesinclude:decreasingcontentofferriteandM23C6carbideinweldandselectingNbaddedweldwireduringwelding.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2005
Journal title
Nuclear Engineering and Design Eslah
Record number
895958
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