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ID:54370890
大小:1.21 MB
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时间:2020-04-30
《低碳硅锰系Q&P钢增塑机制及组织性能.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、低碳硅锰系Q&P钢增塑机制及组织性能低碳硅锰系Q&P钢增塑机制及组织性能LowCarbonSi—MnQ&PSteelPlasticityEnhancementMechanismsandMicrostructureProperty陈连生,赵远,田亚强,宋进英,魏英立,杨栋(河北联合大学河北省现代冶金技术重点实验室,河北唐山063009)CHENLian—sheng,ZHAOYuan,TIANYa—qiang,SONGJin—ying,WEIYing-li。YANGDong(HebeiKeyLaboratoryofModernMetallurgyTech
2、nology,HebeiUnitedUniversity,Tangshan063009,Hebei,China)摘要:采用双相区保温一淬火一配分工艺对低碳硅锰钢进行处理,通过场发射扫描电镜、x射线衍射仪和拉伸实验等对该Q&P钢增塑机制及其组织性能进行研究。结果表明:实验用钢经双相区保温一淬火一配分处理后,综合力学性能优于传统Q&P钢;双相区合理的保温时间可以减少室温组织中二次淬火马氏体含量,以保证更好的塑性;实验用钢经Q&P工艺处理后室温残余奥氏体含量为4.9,而经双相区保温一淬火一配分处理时,随着双相区保温时间的延长,室温残余奥氏体含量呈先增加后减
3、少的趋势,在双相区720℃保温1500s再经Q8LP处理后残余奥氏体含量达到最大值7.3,综合力学性能最佳。关键词:Q&P钢;残余奥氏体;Mn配分;力学性能;强塑积doi:10.11868/j.issn.1001—4381.2014.06.002中图分类号:TG156.1;TG115.21文献标识码:A文章编号:1001—4381(2014)06-0005—06Abstract:LowcarbonSi—Mnsteelwasprocessedthroughintercritiealinsulation—quenching—partitio—ning.T
4、heplasticityenhancementmechanismsandorganizationalperformanceoftheQ&Psteelwerestudiedbymeansoffieldemissionscanningelectronmicroscopy,X—raydiffractionandtensiletests.Theresultsshowthatafterintercriticalinsulation—quenching—partitioning。thesteeldemonstratesSU—periorcomprehensive
5、mechanicalpropertytotraditionalQ&Pstee1.Reasonableintercriticalinsulationtimecanreducethesecondaryquenchingmartensitecontentintheorganization,SOastoensurebetterplasticity.Thecontentofretainedausteniteinthesteelis4.9afterQ&Pprocessing.Withtheex—tensionoftheintercritica1insulatio
6、ntime。thecontentofretainedausteniteinthesteelfirstincreasesandthendecreasesafterintercriticalinsulation-quenching—partitioning.Whenthesteelisintercriticall—lyinsulatedat720℃for1500s,andisthenquenchedandpartitioned,thecontentofretainedausteniteinthesteelreachesthemaximum7.39/6,a
7、ndthecomprehensivemechanicalpropertyofthesteelisthebest.Keywords:Q&Psteel;retainedaustenite;Mnpartitioning;mechanicalproperty;productofstrengthandelongationQ~P(QuenchingandPartitioning)[1]钢是一种求控制在较低水平。因此,Q&P钢的增塑机制问高强度先进汽车用钢,其室温组织主要由贫碳的板条题[6逐渐成为目前研究的重点。近年来,国外学状马氏体和富碳的残余奥氏体组成,在保证
8、较高强度者L81]研究发现,在临界区进行退火时,锰元素向奥氏的同时兼具良好的塑韧性。通常Q&P钢为了获得较体
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