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页数:10页
时间:2019-03-01
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1、MicrostructuralrefinementofduplexstainlesssteelsB.SoyluandR.W.K.HoneycombeTheexperimentalresultsofaninvestigationofachemical(alloying)andaphysical(deformation)methodforrefiningthemicrostructureofduplexstainlesssteelsaredescribed.Thechemicaltechniqueinvolvesalloyingwi
2、thcopper.When3wt-%Cuisaddedtoa30Cr-8Nisteel,itwasfoundthatthecopperprecipitation(whichismorerapidthanthatofaustenite)takesplacewithamultitwinnedmorphology.Thesubsequentferrite-austenitetransformationnucleatedonthefinelydispersedcopperparticlesresultsinafine,homogeneo
3、uslydistributed,twinnedaustenitemorphology.Copperparticlesalsohelpedtherefinementoftheaustenitebypinningtheinterphaseinterfaces.Anotherwayofrefiningthemicrostructureisthroughcolddeformation.Asquenchedfullyferriticsteelwith30%Crand8%Niwascoldrolledbyvariousamountsanda
4、gedattemperaturesbelow1000°C.Onaging,partialrecoveryprecededtheaustenitetransformationandnucleationoccurredmainlyonsubgrainboundaries,thusresultinginarefinedmicrostructure.MST/1221©1991TheInstituteofMetals.Manuscriptreceived7March1990;infinalform14June1990.Theauthors
5、areintheDepartmentofMaterialsScienceandMetallurgy,UniversityofCambridge.Becauseofthehighalloycontent,thesteelswerehomogen-Introductionisedusinghighannealingtemperatures(1100°C)forlongtimes(1-2d).ThespecimensweresolutiontreatedforDuplexstainlesssteelscombinetheattract
6、ivepropertiesof10minat1300°C;theywerethenagedeitherbydirectfullyausteniticandfullyferriticstainlesssteelsandpossesstransfertomoltenmetalbathsorfurnaces,orbyfirstpropertieswhichcannotbeobtainedwitheithersinglequenchingintowaterfollowedbyaging.Theuseofthinphasemicrostr
7、ucturealone.Suchaduplexstructure(ofstripspecimensenabledhighquenchingratestobeausteniteandferrite)combinesthetoughnessandweld-achieved.Forthedeformationexperiments,thewaterabilityofaustenitewiththestrength,corrosionresistance,quenchedfullyferriticstripswerecoldrolled
8、toproduceandstresscorrosioncrackingresistanceofferrite,andinreductionsof5,10,25,and50°/0inthickness.Becauseofadditioncanhaveattract
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