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1、热轧烘烤硬化钢论文：热轧低碳钢烘烤硬化性能与疲劳性能研究【中文摘要】汽车的高性能、轻量化和高安全性需要钢铁材料作为基础。如何在不牺牲汽车安全性能的条件下,能够适度减轻车体的重量,来达到高性能、节能环保的,自然就成为人们一致努力追求的目标。本试验开发的热轧烘烤硬化钢能满足上述要求,因此对汽车用钢的发展有十分重要的意义。本文以自行冶炼的试验钢为研究对象,采用实验室轧机进行热轧实验,观察了试验钢的显微组织,测定了试验钢的力学性能与烘烤硬化性能,分析了烘烤硬化机理。主要研究内容和结果如下:1.利用MST810材料疲劳试验机,测定不同轧制工艺下试验钢的力学性能和烘烤硬化性能,得出试验钢的BH值、BHT
2、值、n值、r值。2.利用光学显微镜(OM)和扫描电镜(SEM)对试验钢的典型组织进行观察,如铁素体组织、铁素体和片层状珠光体组织、铁素体和退化珠光体组织、铁素体和贝氏体组织。研究了显微组织与BH值和BHT值的关系,发现铁素体和退化珠光体组织中,退化珠光体组织对试验钢的BH值和BHT值提高有着积极的作用。3.通过透射电镜(TEM)和扫描电镜(SEM)对试验钢的烘烤硬化机理进行了研究,烘烤硬化由柯氏气团强化、位错强化和析出强化等组成。4.测量了试验钢E14烘烤前后S-N曲线,分析了疲劳性能,确定了疲劳极限。烘烤后的试验钢E14疲劳极限略有提高。【英文摘要】Advancedsteelsarenod
3、oubtthebasisforautomobilestobeofhighperformance,lightweightandsafety.Undertheconditionthatbothkeepingautomotivesafetyperformanceandmoderatelyreducingvehicleweight,howtoachievethepurposeofhighperformance,energyconservationandenvironmentalprotection,naturallybecomesthegoalthatallpeoplepursuits.Thedev
4、elopedhot-rolledbake-hardeningsteelinthispapercansatisfytheabove-mentionedrequirements,soitissignificantforthedevelopmentofautomobilesteel.Thepaperhadstudiedexperimentalsteel,whichsmeltedinthelaboratory.Thehotrollingexperimentwascarriedonlaboratoryrollingmill,themicrostructureofsteelwasobserved,the
5、mechanicalpropertiesandbakinghardeningpropertiesoftheteststeelwasdeterminated,andthebakehardeningmechanismwasanalyzed.Themainstudiedcontentsandresultsareasfollows:1.ThroughfatiguetestsontheMST810,measuringmechanicalpropertiesandbake-hardeningoftheteststeelunderthedifferentsteelrollingtechnology,mea
6、suringthevaluesofBHT,BH,n,r.2.Observatingthetypicalorganizationoftheexperimentalsteelbyopticalmicroscopy(OM)andscanningelectronmicroscopy(SEM),suchasferriteorganization,ferriteandslicelayerpearliteorganization,ferriteanddegradationpearliteorganization,ferriteandbainiteorganization.Studyingtherelati
7、onshipbetweenthemicrostructureandBHvalue,itisfoundthatintheferriteanddegradationpearliteorganization,thedegradationpearliteorganizationisgoodforimprovingthevalueBHTandBH.3.Studyingthebakehardenabilitymechan
