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1、7面上形變誘導(dǎo)鐵素體相變形核機(jī)理研究ZrC/奧氏體相界面上形變誘導(dǎo)鐵素體相變形核機(jī)理研究唐明華劉志義汪新衡胡雙開(kāi)(1.中南大學(xué)材料科學(xué)與工程學(xué)院,湖南長(zhǎng)沙410083;2.湖南工學(xué)院機(jī)械系,湖南衡陽(yáng)421002;3.湖南衡陽(yáng)鋼管(集團(tuán))有限公司,湖南衡陽(yáng)421001;)摘要采用Gleeble-1500熱模擬試驗(yàn)機(jī)進(jìn)行單向壓縮熱模擬試驗(yàn),研究了含ZrC粒子的低碳錳(鈮)鋼在過(guò)冷奧氏體形變過(guò)程中形變誘導(dǎo)鐵素體相變的超細(xì)鐵素體形核機(jī)理。結(jié)果表明:一定粒徑和體積分?jǐn)?shù)的ZrC粒子彌散分布于基體相中時(shí),能阻礙位錯(cuò)的運(yùn)動(dòng),形成集中形變區(qū),因而提高鐵素體形核率,加速DIFT的進(jìn)程,
2、有利于組織超細(xì)化;ZrC/奧氏體相界面上鐵素體形核具有形核位置不飽和性和不均勻性、新生α相具有超細(xì)晶的特點(diǎn),新生鐵素體具有塊狀形貌特征,鐵素體與母相奧氏體之間存在一定的K—S關(guān)系,同時(shí)在DIFT相變中發(fā)生了排碳過(guò)程。作者認(rèn)為ZrC/奧氏體相界面上形變誘導(dǎo)鐵素體相變是受長(zhǎng)程擴(kuò)散控制的擴(kuò)散型相變。關(guān)鍵詞ZrC粒子;低碳錳(鈮)鋼;形變誘導(dǎo)鐵素體相變;超細(xì)晶;相變機(jī)制中圖分類號(hào):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