Effect of Nb and Ti on second-phase precipitation and mechanical properties of 430 ferritic stainless steel-中国Betway体育网页登陆

摘要 TheinfluenceofTiandNbonthemicrostructure,mechanicalproperties,andsecond-phaseprecipitationof430ferriticstainlesssteelwasinvestigated.Inadditiontoopticalmicroscopy,transmissionelectronmicroscopyandX-raydiffractionanalyses,tensiletests,andcarbonitrideextractionexperimentswereconductedtoinvestigatethemicroscopicmechanisms.TheresultsshowedthattheprimaryprecipitatesinSUS430ferriticstainlesssteelwereCr23C6,Mn23C6,andCr7C3,andtheprimarystrengtheningmechanismwasprecipitationstrengthening.WhenTiwasaddedseparately,themainprecipitateswereTiCandTiN.However,coarseTiCadverselyaffectedthemechanicalpropertiesofsteel.Whendouble-stabilizedwithTiandNb,coarseTiCwasreplacedbyfineNbC.Thetypeofprecipitationwasaltered,andprecipitationandsolidsolutionstrengtheningoccurred.Therefore,thetensilestrengthandplasticstrainratio（r-value）improvedto433.60MPaand1.37,respectively.

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Effect of Nb and Ti on second-phase precipitation and mechanical properties of 430 ferritic stainless steel

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