微观组织演变对超高强耐磨钢板力学性能的影响.pdf

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1、第5O卷第9期舍属学玫、，01．50No．9第1055-1062页ACTAME1_ALLURGICASINICASep．2014PP．1055—1062微观组织演变对超高强耐磨钢板力学性能的影响巨彪武会宾唐荻潘学福(北京科技大学高效轧制国家工程研究中心，北京100083)摘要对一种含Nb中碳合金钢进行了两阶段控制轧制和随后的水冷一过冷奥氏体低温弛豫．空冷控制冷却处理(TMcP)，之后加热至900℃保温30rain水淬，再对淬火态的实验钢进行200--400℃温度区间、40rain的回火处理(QT)，结合力

2、学性能测试结果，利用OM，SEM，TEM和XRD对处于不同处理状态的实验钢进行显微组织表征，研究微观组织演变对力学性能的影响．结果表明，TMCP状态的实验钢综合力学性能优于Qr态，这得益于TMCP态保留了轧制细化的原始奥氏体组织，使最终组织细化，空冷马氏体相变过程发生缓慢，利于过冷奥氏体的稳定，从而获得残余奥氏体含量较高的室温组织．各状态下实验钢微观组织以板条马氏体为主，同时包含少量相变孪晶．关键词马氏体，残余奥氏体，力学性能．TMCP中图法分类号TG142文献标识码A文章编号04t2．1961(2014

3、)09—1055．08EFFECToFMICRoSTRUCTUREEVoLUTIoNoNMECHANICALPRoPERTIESoFU1RA．HIGHSTRENGTHWEARRESISTANCESTEELBiao，wu龇ⅣGNXuefuNationalEngineeringResearchCenterforAdvancedRollingTechnology,UniversityofScienceandTechnologyBeijing，Beijing100083Correspondent：WUHu{bin

4、．associateprofessor,Te1．"(Olo)62332598．E-mail：wuhb一@ustb．edu．cnSupportedbyHighTechnologyResearchandDevelopmentProgramofChina(No．2012AA03A508)Manuscriptreceived2013—11—27．inrevisedform2014—04—28ABSTRACTTowellbalancethehardnessandtoughness，existingcommercia

5、lmediumcarbonultra．highstrengthwearresistancesteelplateswithhardnessabove500HBWareusuallyreheatedandquenchedafterhotrolledtoproductionthickness，andthentemperedtoimprovethefinalmechanicalpropertiesoftheplates．Buttheductilitywhichcanbeimprovedbythetempering

6、ofmartensiteislow．Quenchingandpartitioning(Q&P)andquenching—partitioning—tempering(Q—P—T)heattreatmentprocesseswereproposedtostabilizetheaustenitephaseviacarbonpartitioning，andimprovethetoughnessandductilityofmartensiticsteelbythesoftretainedaustenite．The

7、efectsoftheseheattreatmenttechniquesaremuchbetterthanconventionalquenchingandtemperingprocess，butthepoten-tialoftheprocedurebeforeheattreatmentduringtheoverallproductionprocessisnotfullydeveloped．Inthiswork，amediumcarbonalloysteelwithNbadditionwasprocesse

8、dbytwo—stagecontrolrollingfollowedbywatercooling，lowtemperaturerelaxationofsupercooledaustenite，aircooling(thermo-mechanicalrollingprocess，TMCP)．TheTMCPstatesampleswerethenreheatedto900℃andquenchedinwater(WQ)．Aftert