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时间:2020-06-04
《退火时间对冷轧中锰TRIP钢组织和力学性能的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第35卷第9期北京科技大学学报Vb1.35NO.92013年9月JournalofUniversityofScienceandTechnologyBeijingSep.2013退火时间对冷轧中锰TRIP钢组织和力学性能的影响尹鸿祥,赵爱民圜,赵征志,李振,汪志刚,孙璐北京科技大学冶金工程研究院,北京100083圆通信作者,E,mail:aimin.zhao@ustb.edu.cn摘要采用CCT.AY—II型钢板连续退火机模拟分析了退火时间对中锰TRIP钢O.1C一7Mn组织性能的影响规律.利用扫描电镜、透射电
2、镜、电子背散射衍射和X射线能量色散谱等研究了不同工艺下制备的0.1C一7Mn钢的微观组织和成分,利用x射线衍射法测量了残留奥氏体量,利用拉伸试验测试了其力学性能.0.1C一7Mn钢在650℃保温3min退火后获得最佳的综合力学性能,其强度为1329MPa,总延伸率为21.3%,强塑积为28GPa-%.分析认为,0.1C一7Mn钢的高塑性是由亚稳奥氏体的TRIP效应和超细晶铁素体共同提供的,而高强度是由退火冷却过程中奥氏体转变的马氏体和拉伸变形过程中TRIP效应转变的马氏体的强化作用造成的.关键词锰钢;冷轧;退
3、火;微观组织;力学性能;汽车材料分类号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高强度高塑性是汽车薄板一直追求的性能目强塑积在10~20
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