高强度冷轧双相钢应变硬化行为-论文.pdf

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1、第35卷第1期沈阳工业大学学报Vo1．35No．12013年1月JournalofShenyangUniversityofTechnologyJan．2013doi：10．7688／j．issn．1000—1646．2013．01．07高强度冷轧双相钢应变硬化行为：l：赵征志，叶洁云，汪志刚，赵爱民(北京科技大学冶金工程研究院，北京100083)摘要：为了研究双相钢在变形过程中的应变硬化特性，采用Hollomon法与修正的Crussard—Jaoul法分析了试验钢的应变硬化曲线，并利用力学测试与

2、显微组织观察等手段研究了组织结构对应变硬化行为的影响机制．结果表明：三种试验钢，均表现出较高的初始加工硬化能力．具有岛状马氏体与类针状马氏体的双相钢表现出两个阶段的应变硬化特征，具有粗大块状马氏体的双相钢则表现出三个阶段的硬化特征．与类针状和粗大块状马氏体相比，含有岛状马氏体的双相钢表现出较强的加工硬化能力和强度与塑性的良好配合．块状马氏体较早的进入塑性变形，导致双相钢变形协调难度加大并在晶界周围产生孔洞而使塑性恶化．关键词：双相钢；组织形貌；应变硬化；力学性能；马氏体；铁素体；n值；变形协调中

3、图分类号：TG142．1文献标志码：A文章编号：1000—1646(2013)ol一0036—05Strain-hardeningbehaviorofcoldrolleddualphasesteelwithhighstrengthZHAOZheng—zhi，YEJie—yun，WANGZhi—gang，ZHAOAi—min(MetallurgicalEngineeringResearchInstitute，UniversityofScienceandTechnologyBeijing，Beiji

4、ng100083，China)Abstract：Inordertoresearchthestrain—hardeningcharacteristicsofdualphase(DP)steelsduringdeformation，thestrain—hardeningcurvesofexperimentalsteelswereanalyzedwithHollomonandmodifiedCrussard—Jaoul(C—J)methods．Andtheinfluencingmechanismofm

5、icrostructureonthestrain—hardeningbehaviorwasinvestigatedwithmechanicalpropertytestsandmicrostructuralobservation．Theresultsshowthatthreekindsofexperimentalsteelsallexhibithigherinitialwork—hardeningcapability．TheDPsteelscontainingisland—shapedandnee

6、dle—likemartensiteshowtwo—stagestrain—hardeningcharacteristics，whiletheDPsteelcontainingcoarsemassivemartensiteexhibitsthree-stagestrain—hardeningcharacteristics．ComparedwiththeDPsteelscontainingneedle—likeandcoarsemassivemartensite，theDPsteelwithisl

7、and—likemartensitepossessesstrongerworking—hardeningcapabilityandbettermatchinbothstrengthandplasticity．Themassivemartensiteparticipatesinplasticdeformationatearlierstage，whichincreasesthedificultyinthedeformationcompatibilityofDPsteelandcausesthedet

8、eriorationintheplasticityduetotheappearanceofvoidsaroundgrainboundaries．Keywords：dualphasesteel；microstructuralmorphology；strain—hardening；mechanicalproperty；martensite；ferrite；nvalue；deformationcompatibility近几年来，高强或超高强冷轧双相钢之所以型优异特性，如高的初始加工硬化率(n)与连续颇