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Title
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Development of a high strength and ductile Nb-bearing dual phase steel by cold-rolling and intercritical annealing of the ferrite- martensite microstructures
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Type
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JournalPaper
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Keywords
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,Dual phase steel ,Cold-rolling ,Intercritical annealing ,Niobium Grain refinement
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Abstract
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Dual phase(DP)steelscontainingdifferentamountsofNbmicroalloyingelementwereproducedbycold- rolling followedbyintercriticalannealingofaferrite-martensiteduplexstartingstructure.Theeffectsof Nb contents(0.00,0.06,0.12and0.18wt%)andintercriticalannealingtimeonthemicrostructural evolutions andmechanicalpropertieswerestudied.Resultsfrommicroscopicimagesshowedthatin- creasing Nbcontentincreasedthevolumefractionofmartensiteanddecreasedtheaveragegrainsizeof ferrite. Tensileresultsillustratedanexcellentstrength-elongationbalanceintermsofenergyabsorption (160Jcm3) andtoughness(229MPa).Thelowestgrainsizeofabout1.4070.37 mmwasachievedinthe DP steelcontaining0.12wt%Nbwhosestrengthwasabout123%higherthanthatoftheas-received ferritic-pearlitic steel(e.g.540MPa),withoutlossofductility.Thevariationsofstrength,elongationand fracturemechanismofthespecimenswithNbcontentsandintercriticalannealingtimewerecorrelated to themicrostructuralfeatures
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Researchers
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Yousef Mazaheri Roudbali (Fourth Researcher), Abbas Najafizadeh (Third Researcher), Ahmad Kermanpur (Second Researcher), Ali Ghatei Kalashami (First Researcher)
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