BT22高強(qiáng)度鑄造鈦合金組織與性能的研究.pdf

1、機(jī)械科學(xué)研究總院沈陽(yáng)鑄造研究所碩士學(xué)位論文BT22高強(qiáng)度鑄造鈦合金組織與性能的研究姓名：閆平申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：材料加工工程指導(dǎo)教師：王利趙軍20070714機(jī)械科學(xué)研究總院碩士學(xué)位論文StudyonMicrostructuresandMechanicalPropertiesOfHighstrengthBT22CastTitaniumAlloyABSTRACTThehighs仃engthtitaniumalloysareofadva

2、ntagessuchashi曲strength，highspecifics仃engthandexcellentcorrosionresistantcharacteristic，andhavebeenwidelyappliedinaerospace，etcHoweverthesortsofhighs訂engthtitaniumalloysarefewathomeandthestudyonmicrostructuresandmechanic

3、alpropertiesoflligh—strengthcasttitaniumalloysisnotsystematic，tooTherefore，authorstudiedonmicrostructureandmechanicalpropertiesofBT22titaniumalloy硒castandfurth—erstudiedtheinfluenceofthesolutionheattreatmenttemperature，t

4、hecoolingrate，theagingtemperatureandthesoakingtimeonthemicrostmcturesandthemechanicalpropertiesofBT22casttitaniumalloyanddeterminedtheheattreatmentprocessparametersfortheBT22high—strengthcasttitaniumalloyTheworkdepicteda

5、boveprovidedtheoreticalbasisforputtingthehi曲一strengthcasttitaniumalloysintopracticeThestudyresultsprovedthatthetransitionpointofnphasetoBphaseofBT22castalloyis885。C，andtheheattreatmentprocessparametershavegreateffectonth

6、emicrostructuresandpropertiesofthealloyUndertheconditionofless885Csolutionheattreatment，theneedle—likeaphaseswillseparateoutintheoriginalpphasegrainsforthealloyundertheconditionofover885“Csolutionheattreatmentandthencool

7、ingbywatersingleBphasemierostructurewillheobtained，andthealloywillbeofgoodplasticpropertyundertheconditionof810。Cand7600Ctwo—stagesolutionheattreatmentandthencoolinginakthemicrostructuresofthealloywillbehomogeneousandthe