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1、第35卷第9期北京科技大學學報Vb1.35NO.92013年9月JournalofUniversityofScienceandTechnologyBeijingSep.2013退火時間對冷軋中錳TRIP鋼組織和力學性能的影響尹鴻祥,趙愛民圜,趙征志,李振,汪志剛,孫璐北京科技大學冶金工程研究院,北京100083圓通信作者,E,mail:aimin.zhao@ustb.edu.cn摘要采用CCT.AY—II型鋼板連續(xù)退火機模擬分析了退火時間對中錳TRIP鋼O.1C一7Mn組織性能的影響規(guī)律.利用掃描電鏡、透射電
2、鏡、電子背散射衍射和X射線能量色散譜等研究了不同工藝下制備的0.1C一7Mn鋼的微觀組織和成分,利用x射線衍射法測量了殘留奧氏體量,利用拉伸試驗測試了其力學性能.0.1C一7Mn鋼在650℃保溫3min退火后獲得最佳的綜合力學性能,其強度為1329MPa,總延伸率為21.3%,強塑積為28GPa-%.分析認為,0.1C一7Mn鋼的高塑性是由亞穩(wěn)奧氏體的TRIP效應和超細晶鐵素體共同提供的,而高強度是由退火冷卻過程中奧氏體轉(zhuǎn)變的馬氏體和拉伸變形過程中TRIP效應轉(zhuǎn)變的馬氏體的強化作用造成的.關鍵詞錳鋼;冷軋;退
3、火;微觀組織;力學性能;汽車材料分類號TG335.3Efectofannealingtimeonthemicrostructureandmechanicalprop—ertiesofacoldrolledmedium-manganeseTRIPsteelYINHong—xiang,ZHAOAi—min函,ZHAOZheng.zhi,LIZhen,WANGZhi—gang,SUNLuMetallurgicalEngineeringResearchInstitute,UniversityofScienceandT
4、echnologyBeijing,Beijing100083,China圜Correspondingauthor,E—mail:aimin.zhao~ustb.edu.caABSTRACTTheefectsofannealingtimeonthemicrostructureandmechanicalpropertiesofacoldrolledmedium—manganeseTRIPsteel0.1C一7MnwereanalyzedonaCCT—AY—IIheattreatmentsystemforthins
5、teelsheet.Themierostructureandcompositionofthesteelobtainedthroughdiferentannealingprocesseswereinvestigatedbymeansofscanningelectronmicroscopy,transmissionelectronmicroscopy,electronbackscatterdifraction,andenergydispersiveX—rayspectroscopy.Theamountofreta
6、inedausteniteinthesteelwasdeterminedbyX—raydifractionanalysisandthemechanicalpropertiesweremeasuredbytensiletesting.Thesteelannealedat650℃for3minhasthebestcomprehensivemechanicalproperties,withthetensilestrengthof1329MPa,thetotalelongationof21.3%,andtheprod
7、uctoftensilestrengthandelongationof28GPa·%.ItisbelievedthatthehighplasticityisprovidedbytheTRIPefectofmetastableaustenitetogetherwithultra-finegrainedferrite.Thehighstrengthiscausedbymartensitewhichisdirectlytransformedfromausteniteinthecoolingprocessduring
8、annealingandobtainedduringthetensiledeformationattributedtotheTRIPeffect.KEYWORDSmanganesesteel;coldrolling;annealing;microstructure:mechanicalproperties;automobilematerials高強度高塑性是汽車薄板一直追求的性能目強塑積在10~20