面上形变诱导铁素体相变形核机理研究

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1、7面上形变诱导铁素体相变形核机理研究ZrC/奥氏体相界面上形变诱导铁素体相变形核机理研究唐明华刘志义汪新衡胡双开（1.中南大学材料科学与工程学院，湖南长沙410083；2.湖南工学院机械系，湖南衡阳421002；3.湖南衡阳钢管(集团)有限公司，湖南衡阳421001；)摘要采用Gleeble-1500热模拟试验机进行单向压缩热模拟试验，研究了含ZrC粒子的低碳锰(铌)钢在过冷奥氏体形变过程中形变诱导铁素体相变的超细铁素体形核机理。结果表明：一定粒径和体积分数的ZrC粒子弥散分布于基体相中时，能阻碍位错的运动，形成集中形变区，因而提高铁素体形核率，加速DIFT的进程，

2、有利于组织超细化；ZrC/奥氏体相界面上铁素体形核具有形核位置不饱和性和不均匀性、新生α相具有超细晶的特点，新生铁素体具有块状形貌特征,铁素体与母相奥氏体之间存在一定的K—S关系，同时在DIFT相变中发生了排碳过程。作者认为ZrC/奥氏体相界面上形变诱导铁素体相变是受长程扩散控制的扩散型相变。关键词ZrC粒子；低碳锰(铌)钢；形变诱导铁素体相变；超细晶；相变机制中图分类号:TG142.11,2123StudyofNucleatingMechanismofDeformationInducedFerriteTransformationatZrC/AusteniticIn

3、terfaceTANGMing-huaLIUZhi-yiWANGXin-hengHUShuang-kai1,2123(1.SchoolofMaterialsScienceandEngineeringCentralSouthUniversity,ChangshaH'unan,410083,china.2.DepartmentofMechanicalEngineeringofHunanInstituteTechnology,HengyangH'unan,421002,China.3.HunanHengyangSteelTube(Group)CO,LTD,

4、HengyangH'unan421001,china.)ABSTRACTThenucleatingmechanismofultra-fineferriteofdeformationinducedferritetransformationoflowcarbonmanganese(niobium)steelobtainingZrCparticlesduringundercooledaustenitedeformationwasinvestigatedbyunidirectionalcompressionthermalsimulatingexperimentwit

5、hGleeble-1500.TheresultsshowthatZrCparticlescanhinderdislocation-motionandformconcentratedegreeofthelocateddeformationinaustenitewhenZrCparticleswhichdefiniteradiusandsuitablevolumefractionisdisperseddistributedinbasalphase,thusimproveferritenucleatingrateandaccelerateDIFTprocesswhichl

6、eadstothefurtherrefinementmicrostructure.TheferritenucleatingatZrC/austeniteinterfacehaveunsaturatedandheterogeneitybehaviourofnucleatinglocation,regenerateαphasehasultra-finegrainscharacter.andK—Srelationisexistedbetweenferriteandparentphaseaustenite,simultaneously,diffusionofcarbonat

7、omshappenedduringDIFT.TheauthorregardthatthedeformationinducedferritetransformationatZrC/austeniteinterfaceissubjecttodiffused-patternphasechangewhichcontrolledbylong-pathdiffusion.KEYWORDSZrCparticles;low-carbonmanganese(niobium)steel;deformationinducedferritetransformation;ultra-fi