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ÖÐͼ·ÖÀàºÅ:TG17 ÎÄÏ×±êÖ¾Âë:A ÎÄÕ±àºÅ:1001-4012(2021)05-0014-04
CauseofFailureinIntergranularCorrosionTestofS32101Duplex
StainlessSteelWeldedJoint
TANGQinyan,HUANG Minmin,XUYunwei,LIUHengji,YEShangjie,JIANGSiyuan
(ChinaEnergyEngineeringGroupZhejiangThermalPowerConstructionCo.,Ltd.,Hangzhou310016,China)
Abstract:InordertoexplorethereasonofunqualifiedintergranularcorrosiontestofS32101duplexstainless
steelweldedjoint,metallographicexamination,Xrayphotoelectronspectroscopy(XPS)analysisandferritecontent
testwerecarriedoutonweldedjointwhichfailedinintergranularcorrosiontest.Theresultsshowthatthereason
forthefailureofintergranularcorrosiontestisthatthereischemicalcompositionsegregationinthe material,
resultinginthelowcontentofchromium,andchromium carbideprecipitatesatthegrainboundaryduringthe
weldingprocess,formingachromiumpoorzone,whichleadstothereductionofintergranularcorrosionresistance
ofthematerial.Inaddition,thelowcontentofferriteinthemicrostructurealsoincreasesthepossibilityofthe
formationofchromiumpoorzoneandfurtherreducestheresistancetointergranularcorrosion.
Keywords:intergranularcorrosion;metallographicexamination;X-rayphotoelectronspectroscopyanalysis;
ferrite;chromiumpoorzone
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