熔體溫度處理對ZL114A合金組織及其性能的影響.pdf

1、西北工業(yè)大學(xué)碩士學(xué)位論文熔體溫度處理對ZL114A合金組織及其性能的影響姓名：楊志懷申請學(xué)位級別：碩士專業(yè)：凝聚態(tài)物理學(xué)指導(dǎo)教師：張蓉20070301西北T業(yè)大學(xué)碩士學(xué)位論文ABSTRACTABSTRACTZLl14Aisonekindofimportantcastingalloywidespreadapplicationinaerospaceaswell船consumerindustrydomainInordertoobtainthe

2、fineperformance，deteriorationprocessingwasusedThetreatmentmethodsarecomplexandthequalityisunstableInrecentyears，themeltprocessingtreatmenthasobtainedwidespreadattentionButtheresearchabouttherelationshipamongmeltstructure

3、，solidificationorganizationandthemechanicscapabilitywasonlyalittleByusingtheDifferentScanningCalorimetric(DSC)results，thisthesisstudiedtheeffectsofmeltstructureandmelttemperatureprocessingonZLI14Aalloycoagulationorganiza

4、tionandmechanicsperformanceHasobtainedthefindings嬲following：1TheDSCresultsindicatethatabovetheliquidustemperaturetheZLl14AalloymeltsstructurechangesalongwiththeincreaseoftemperatureInfluencedbydynamicsfactors，themeltstru

5、cturetransformationCan’treversecompletely2n圮coolingspeedisoneofcrucialfactorswhicheffectthecoagulationorganizationAlongwimtheincreasingofcoolingspeedthesecondarydendritearmdistanceX2aAlreduceslightlyandtheprimarygraincoa

6、rsensHi曲coolingspeedhassuppressedtheternaryorquadrinomialeutecticreactionMicrohardnessanalysisindicatestheincreasetendencyofcoagulationintestspecimen3Thehigherofmelttemperatureandthemoreeasilytoeliminatetheshapeofheterog

7、enonscoreAccompanyingtheincreasesupercoolingdegree，itisadvantageousinorganization’SrefinementAtthesametime，thetemperaturedecreasespeedinTs—TosectionhasimportantinfluenceoncoagulateorganizationTheincreaseofTsTosectioncool

8、ingrateisadvantageousinobtainsthetinyevenmicrostrueture4ThroughthemelthotfastprocessingcrafttheZLl14Aalloytensilestrengththerelativeelongationratioandthemicrohardnessincreaseafterthehotfastprocessingcraftcomparedtotheraw

9、material，itstoughnessallbigsurpassestheT6processingPassesthroughinparticular820“CthehotfastprocessingtestspecimentherelativeelongationratioisT6processingtestspecimen78times，itstensilestrengthandthemiemhardnessapproachedi