汽車同步器齒環(huán)用hal62430.1合金組織與性能的研究

1、中南大學(xué)碩士學(xué)位論文汽車同步器齒環(huán)用HAL62430.1合金組織與性能的研究姓名：肖蔭果申請學(xué)位級別：碩士專業(yè)：材料加工工程指導(dǎo)教師：張勝華20030101ABSTRACTTheHAl62—4—301braSsalloyhadbeensuccessfullyprep邵edbymeansofverticalcastingmethodThedefonnationbehaViorofthisalloyduringcompressprocess

2、hasbeeninvestigatedwimphysicalsimulationtectlIliquesbyupsettestsofa110ys鋤ples，andtheoptimumheattreatcDnditionsweredeterminedbyorthogonalmethodUsinganMHK一500typetestermeaSⅢcdtheirmctionandwearpropeniesunderdi疵remcondition

3、s，Themicros咖ctureandsurf赴emicrographwereinvestigatedbymeaJlsofSEM，microprobea11dTEMTheresultsareasf01lows：111letmestressofhotdefbrmatlonotalloyincreasesⅥ也themcreaseothestralnrateandmedecreaseofmetemperacureAt10wer3trainr

4、ates，thestress—straincurveissmooth，exhibitingnowelldeflnedyields仃ess，butathigherstrainratethetmestressvaluefeachestheapexrapidlyatmeinitiaIstage，thendecreasedatldconvergestoasteadylevelduetomesoRene行bctTheconstitutiVeequ

5、ationforhotdefornlationofalloyisobtainedonthcbasisofhyperb01icsineformmodel，arIdthematerialconstatltsincludingactivationene唱y，stressexponenta11dA，口，∥arealsoobtained2T11emicrostructureofalloyshowsmatitconsiStsoflightetchi

6、ngareasofophase，whichhaveawidmanstattenmorphology，adarker_etchingmatrixof0phase，androdshapedmangaIlesesilicidepanicles塒thahexagonalcross—sectionThemicmstructurea11dpropeniesofas—caStalloywasimprovcdbyhomogenizingat750℃fo

7、r6h，andtheexperimentaIalloycangett11ebestmechallicalpropertiesafterquenchingfor90minat750℃a11dagingfor60minat300℃3T】1ewearmechanismsofexperimentalmaterialagainstGCrl5steelunderdryfrictionconditionweresystematicallyinvest

8、igated，t11ewearresistancepropertyoftwootberspecialbrassa110yswascomparedwithexperimentalalloyAsaresult，experimentalalloyhaveexcellentwearresistibilityThemainwearmechallismwasadherencewear，andplasticdefoming，f缸iguefmcture

9、，andabmsiVeweararealsofoundinexperimentala1IoyBylinearregression，therelationoffrictioncoemcient，p，orwearrate，w，toload，Rcanbedes皤ibedasw(o1)=abpc礦d礦Keywords：specialbrass，hotdefoHnation，n。wstfess，miaostf∞tu犯，Mfl5Si3p瞰ickwe