金属材料工程毕业论文

内蒙古科技大学本科生毕业论文题目：化学成分对实验钢热处理组织、硬度的影响学生姓名：XXX学号：XXXXXXXXXX专业：金属材料工程班级：材料20XX-1班指导教师：XXX教授内蒙古科技大学毕业论文I化学成分对实验钢热处理组织、硬度的影响摘要为了提高机械产品的质量及使用寿命,几乎所有重要的机械零件都需要进行热处理。合金化配合适当的热处理能够显著提高工件的性能，使钢能够满足所需的力学、工艺及其他特殊性能。本文以化学成分不同的A3、A6两种钢为研究对象，对实验钢进行不同的热处理之后，分析化学成分和热处理工艺对实验钢组织和硬度的影响规律，为提高实验钢的使用性能提供实验依据。本研究借助于金相显微镜和硬度测试仪，研究了实验钢在不同退火温度、淬火温度、回火温度下的组织和硬度，分析了化学成分、加热温度对实验钢退火组织及硬度、淬火组织及硬度、回火组织及硬度的影响。研究了实验钢正火处理对组织及硬度的影响。结果表明：随着退火温度的升高，A3钢中珠光体片间距逐渐增大，A6钢中的珠光体形态由粒状向片状转变；A6钢在正火处理空冷时发生马氏体转变；A3钢的淬火组织由马氏体和托氏体组成，A6钢淬火组织由马氏体和未溶碳化物组成；A6钢中由于合金元素的作用，回火稳定性提高；在所有相同的热处理条件下，A6钢的硬度均远大于A3钢的硬度。关键词：热处理；化学成分；组织；硬度内蒙古科技大学毕业论文IIEffectofChemicalCompositionontheMicrostructureandHardnessoftheExperimentalSteelsafterHeatTreatmentAbstractInordertoimprovethequalityofmechanicalproductsandservicelife,almostalltheimportantmechanicalpartsarerequiredforheattreatment.Alloyingwithappropriateheattreatmentcansignificantlyimprovetheperformanceoftheworkpiece,sothatthesteelcanmeettherequiredmechanical,processingandotherspecialproperties.Inthispaper,A3,A6twosteelsofdifferentchemicalcompositionsareusedastheresearchobjects,afterdifferentheattreatmentsontheexperimentalsteels,thepaperanalyzestheinfluenceofchemicalcompositionandheattreatmentprocessingonthemicrostructureandhardnessoftheexperimentalsteelstoprovidetheexperimentalbasisforimprovingthepropertiesofthesteel.Inthisstudy,bymeansofmetallographicmicroscopeandhardnesstester,theexperimentresearchesthehardnessofthesteelatdifferentannealingtemperature,quenchingtemperatureandtemperingtemperature.Inaddition,itanalysestheinfluenceofchemicalcompositionandheatingtemperatureonthemicrostructureandhardnessafterannealing,quenching,tempering.ThepaperstudiedtheinfluenceonMicrostructureandhardnessoftheexperimentalsteelafternormalizingtreatment.Theresultsshowthat,withtheincreaseofannealingtemperature,thedistanceofthepearliteintheA3steelincreasesgradually,thepearlitemorphologytransformedfromgranulartosheet;TheA6steelproducesmartensitetransformationafternormalizingaircooling;ThemicrostructureofA3steelafterquenchingconsistsofmartensiteandtroostite,ThemicrostructureofA6steelafterquenchingconsistsofmartensiteandundissolvedcarbide;Duetotheeffectofthealloyelements,thetemperingstabilityofA6steelisimproved;inallthesameheattreatmentconditions,thehardnessoftheA6steelisfargreaterthanthehardnessoftheA3steel.Keywords:heattreatment;Chemicalcomposition;microstructure;hardness内蒙古科技大学毕业论文III目录摘要.............................................................................................................................................IAbstract....................................................................................................................................II目录..........................................................................................................................................III第一章文献综述......................................................................................................................11.1实验钢A3钢、A6钢的概述.....................................................................................11.2合金元素在钢中的作用............................................................................................21.2.1钢中主要的合金元素及其分类....................................................................21.2.2合金元素在钢中的存在形式及分布............................................................21.2.3合金元素与铁的相互作用............................................................................21.2.4合金元素对钢加热时奥氏体组织转变的影响............................................31.2.5合金元素对钢的过冷奥氏体分解转变的影响............................................41.2.6合金元素对淬火钢的回火转变过程的影响................................................51.2.7合金元素对钢强度的影响............................................................................51.3热处理技术的发展及展望........................................................................................61.4本文选题意义及研究内容........................................................................................8第二章实验材料及方法........................................................................................................102.1实验材料..................................................................................................................102.2实验设备..................................................................................................................102.3实验步骤..................................................................................................................102.3.1热处理前的试样制取..................................................................................102.3.2试样热处理保温时间的确定......................................................................112.3.3退火实验......................................................................................................112.3.4正火实验......................................................................................................122.3.5淬火实验......................................................................................................132.3.6回火实验..............................................................