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当前位置:首页 > 商业/管理/HR > 公司方案 > 复合细化变质及热处理对高强铸造铝硅合金组织及性能影响的研究
本科生毕业设计(论文)学院(部):___机械与汽车工程学院专业:材料成型及控制工程学号:____学生:__指导教师:____完成日期2017年5月南阳理工学院本科生毕业设计(论文)复合细化变质及热处理对高强铸造铝硅合金组织及性能影响的研究EffectofCompoundModificationandHeatTreatmentonMicrostructureandPropertiesofHighStrengthCastAlSiAlloy总计:毕业设计(论文)表格:6个插图:4幅复合细化变质及热处理对高强铸造铝硅合金组织及性能的影响I复合细化变质及热处理对高强铸造铝硅合金组织及性能影响的研究材料成型及控制工程专业XXX[摘要]铸造铝硅合金因为其具有优良的铸造性能,在发动机缸盖、汽车轮毂等得到广泛的应用。但铸造铝硅合金自身强度相对较低,不是高强性铝合金,本课题以ZL101为基础,通过合金化手段调整其成分,研究多元Al-7Si-1.8Cu-0.3Mg-Ni-0.1V的复合细化变质及热处理对其组织及性能的影响,从而为开发出高强铸造铝硅合金新材料奠定基础,扩大铝材在汽车上的铝化率。本次课题研究结果表明:(1)对铸造Al-7Si-1.8Cu-0.3Mg-Ni-0.1V用晶粒细化剂Al-5Ti-B、变质剂Al-10Sr和RE(单质Ce)进行复合细化变质时,能使合金组织的α-Al相得到很好的细化,且共晶硅也由粗大片状或针状变成纤维状或颗粒状,减小了对基体的割裂作用。(2)对复合细化变质后的铸造Al-7Si-1.8Cu-0.3Mg-Ni-0.1V进行T6热处理,研究不同的固溶处理工艺对其组织和性能的影响。经过试验之后,得出最优的固溶处理工艺参数为加热540℃,保温6h,80℃水冷。经优化后的合金抗拉强度提高到363.52MPa,较未热处理的铸态抗拉强度提升了28.0%,但伸长率有所下降;热处理之后试样的组织更加致密,细小,均匀,第二相弥散分布起到了很好的强化作用。[关键词]铸造铝硅合金;复合细化变质;T6热处理;金相组织;力学性能复合细化变质及热处理对高强铸造铝硅合金组织及性能的影响IIEffectofCompoundModificationandHeatTreatmentonMicrostructureandPropertiesofHighStrengthCastAlSiAlloyMaterialFormingandControlEngineeringWEIYuanjinAbstract:CastAlSialloyhasbeenwidelyusedinenginecylinderheadandwheelhubduetoitsgoodcastingperformance.However,thestrengthofcastAlSialloyislowerthanthatofhighstrengthcastaluminumalloy,ThistopicisbasedonZL101,adjustingitscompositionbyalloying,effectofcompoundmodificationandheattreatmentofAl-7Si-1.8Cu-0.3Mg-Ni-0.1Vcastontheorganizationandperformance,soastorealizethedevelopmentofnewmaterialsofhighstrengthcastingaluminumsiliconalloy,expandingAluminumAlloyaluminuminthecarontherate.Theresearchresultsshowthat:(1)TocastAl-7Si-1.8Cu-0.3Mg-Ni-VinAl-5Ti-BgrainrefinerandAl-10Srmodifier,RE(rareearthelementCe)compositemodification,thealpha-Alalloymicrostructurerefinementphaseisverygood,andtheeutecticsiliconisalsoamassiveorcoarseacicularintofibrousorgranular,reducestheseparationeffectonthematrix.(2)TheeffectofdifferentsolidsolutiontreatmentonthemicrostructureandpropertiesofcastAl-7Si-1.8Cu-0.3Mg-Ni-0.1VafterT6wasstudied.Aftertheexperiment,itisconcludedthattheoptimalsolidsolutiontreatmentparametersareheating540℃,preservingheat6h,water-cooling80℃.Afteroptimization,thetensilestrengthofthealloywasincreasedto363.52MPa,andthetensilestrengthofthecaststeelwas28%higherthanthatofthenonheattreatment,buttheelongationdecreased;Afterheattreatment,themicrostructureofthesampleismorecompact,fineanduniform,andthesecondphasedispersiondistributionplaysagoodroleinstrengthening.Keywords:castAlSialloy;compositerefinementandmodification;T6heattreatment;microstructure;mechanicalproperties复合细化变质及热处理对高强铸造铝硅合金组织及性能的影响目录1绪论.............................................................................................................................................................11.1引言..................................................................................................................................................11.2铝合金及铸造铝合金简介..............................................................................................................11.2.1铝合金简介...........................................................................................................................11.2.2铸造铝合金简介...................................................................................................................11.3高强铸造铝硅合金..........................................................................................................................11.4课题研究的目的和意义及主要内容..............................................................................................31.4.1课题研究的目的和意义.......................................................................................................31.4.2课题研究的主要内容...........................................................................................................32实验方案和熔炼工艺的确定.....................................................................................................................42.1实验所用材料..................................................................................................................................42.2实验仪器及设备..............................................................................................................................42.3熔炼前实验准备..............................................................................................................................62.4熔炼步骤及方法..............................................................................................................................62.5热处理工艺......................................................................................................................................72.5.1固溶处理...............................................................................................................................82.5.2时效处理...............................................................................................................................82.6力学性能测试..................................................................................................................................82.7金相试样制备...................
本文标题:复合细化变质及热处理对高强铸造铝硅合金组织及性能影响的研究
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