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1、REVIEWProcesses,microstructureandpropertiesofvanadiummicroalloyedsteelsT.N.Baker*Vanadiumasanimportantalloyingelementinsteelswasinitiallyassociatedwiththepropertiesachievedfollowingtempering.Interestinthemicrostructurewasstimulatedbytheadventoftransmissionelect
2、ronmicroscopeswitharesolutionofy1nmtogetherwithselectedareaelectrondiffractiontechniques.Asecondtimelydevelopmentwasthatofcontrolledrolling,particularlyofplateandsheetproducts.Thescopeofthisreviewwillincludethehistoricalbackgroundonquenchedandtemperedvanadiumst
3、eels,precipitationduringisothermalaging,conventionalcontrolledrollingandduringthinslabdirectchargingandthedevelopmentofstrengthandtoughnessinvanadiummicroalloyedsteels.Thecharacterisationofmicrostructure,inparticularthemethodsfortheanalysisofthechemicalcomposit
4、ionofprecipitateshasprogressedsincetheavailabilityofX-rayenergydispersiveanalysisinthe1970s,andtheroleplayedbyelectronenergylossspectroscopyinprovidingquantitativeanalysisofcarbonandnitrogeninvanadiummicroalloyedsteelswillbepresented.Therearestillmanytopicsinvo
5、lvingvanadiummicroalloyedsteelsthatarecontroversial.Theseincludethenucleationsequenceofhomogeneousprecipitatesofvanadiumcarbonitrideandwhetherthisoccurscoherently,thecompositionofthevanadiumprecipitates,thenucleationmechanismforinterphaseprecipitation,theimport
6、anceofstraininducedprecipitationinausteniteofvanadiumcarbonitride,thecontributionsofbothinterphaseprecipitationandrandomprecipitationinferritetotheyieldstrength,andtheroleoftheprocessrouteparametersindevelopingproperties.Thesetopicswillbeconsideredinthispaperwh
7、ichconcentratesonhotrolledvanadiummicroalloyedsteelsplacedinthecontextofpertinentresearchonotheralloys.Keywords:Vanadium,MicroalloySteels,Processes,Microstructure,Properties4Introductionwhichincludesvanadiumsteels,isthatbyPickering,whichconsideredthesituationup
8、to1975.DespitetheNorecentcomprehensivereviewonvanadiuminamountofpublishedworkontheeffectofvanadiumonPublishedbyManeyPublishing(c)IOMCommunicationsLtdmicroalloyedsteels,alsok
