非调质钢汽车连杆热处理工艺研究

本科学生毕业论文非调质钢汽车连杆热处理工艺研究系部名称：专业班级：学生姓名：指导教师：职称：二○○九年六月TheGraduationThesisforBachelor'sDegreeNon-QuenchedandTemperedSteelHeatTreatmentProcessofAutomobileConnectingRodCandidate：ZhaoSipuSpecialty：MaterialsScienceandEngineeringClass：B05-64Supervisor：LecturerWangWeiHeilongjiangInstituteofTechnology2009-06·HarbinI摘要汽车连杆是往复活塞式内燃机的重要零件。内燃机工作时，连杆的小头和活塞一起沿气缸中心线往复运动，连杆的大头则与曲轴柄一道作旋转运动。本文在绪论中综述了国内外非调质钢的研究、开发与应用的状况。研究了48MnV，40MnV为代表的汽车用感应淬火用非调质钢的组织、常规力学性能与感应淬火性能，提出了适合于实际生产的非调质钢的组织及受控因素。为节减能耗、杜绝淬火裂纹、减少变形、改善切削加工性能、降低制造成本，国内、外相继采用非调质钢替代调质钢制作汽车连杆。关键词：非调质钢；汽车连杆；热处理；性能；应用IIABSTRACTAutomobileconnectingrodisoneofimportantcomponentsinthereciprocatinginternalcombustionengines.Wheninternalcombustionengineworks,connectingrodsmallendmovestoandfroalongthecentrallineofthecylindertogetherwithpiston,andconnectingrodbigendandcrankshaftshankrevolvetogether.Thisarticlesummarizesaresearching、developmentandapplication.Inthisbase,introducestheaspectofmicroalloyedsteelsdevelopmet，includingstrengtheningandtoucheningmechanisms、typicalelementandmicrostructureofmicroalloyednon-temperingsteelswithferrite-pearlite、bainiteandmartensite.Thetextreseachesthemicrostructure、ordinarymechanicalproperties、inducing-quenchingfeatureandfatiguefeatureofmicroalloyedsteels48MnVand40MnV,stressesforgingprocessthatissimulatedwithawayofnormalorapproximatelynormalheatingandcooling，advancesmicrostructureandcontroledfactorswhicharesuitableforactualapplicationnsofmicroalloyedsteels.Thusnon-temperedandquenchedsteelwereadoptedinsteadoftemperedandquenchedsteelinmanycountriesinordertosaveenergy,avoidthecrackanddistortioninquenching,andimprovetheperformanceofcuttingandreducingthecostofmanufacturing.Keywords:Non-temperedandQuenchedSteel;AutomobileConnectingRod;HeatTreatment;Propert;Application目录摘要.........................................................................................................................................IABSTRACT........................................................................................................................II第1章绪论................................................................................................................11.1引言...........................................................................................................................11.2汽车连杆分类和结构...............................................................................................21.2.1汽车连杆分类.................................................................................................21.2.2汽车连杆主要结构.........................................................................................31.3国内、外连杆材料研究现状...................................................................................31.3.1国内发动机连杆研究现状.............................................................................31.3.2国外发动机连杆研究现状.............................................................................41.4连杆材料的常见热处理工艺...................................................................................51.5选题的目的和意义...................................................................................................71.6本文的主要研究内容...............................................................................................7第2章汽车连杆材料.....................................................................................................92.1连杆用钢的种类和特点...........................................................................................92.1.1调质钢.............................................................................................................92.1.2非调质钢.........................................................................................................92.2非调质钢连杆与调质钢连杆使用性能比较.........................................................122.3本章小结.................................................................................................................13第3章非调质钢连杆热处理工艺设计..................................................................143.1试验材料.................................................................................................................143.1.1试验用料.......................................................................................................143.1.2试样预处理...................................................................................................143.2试验设备.................................................................................................................153.3试验技术路线.........................................................................................................153.3.1试样组织和力学性能的试验........................................................................153.3.2试样感应淬火性能的试验............................................................................163.3.3试验过程.......................................................................................................163.3本章小结.................................................................................................................17第4章加热温度和冷却方式对试样的影响...............................................