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时间:2020-04-30
《一种新型高强高韧TC27钛合金的高温变形行为.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、科技导报2014。32(24)WWW.kjdb.org针垒,一........▲种新型高强高韧TC27钛合金的高温变形行为张业勤’,谷志飞,沙爱学’,黄利军’,鲁世强。1.北京航空材料研究院,北京1000952.内蒙古第一机械集团公司,包头0140303.南昌航空大学材料科学与工程学院,南昌330063摘要采用Gleeble3500热模拟机对一种新型高强高韧TC27钛合金进行等温恒应变速率压缩实验,开展TC27钛合金的高温变形行为研究。为制定TC27钛合金的热加工工艺提供依据。研究结果表明,TC2
2、7钛合金应力应变曲线在变形温度较低时大致呈应变软化型;而在变形温度较高且应变速率较低时,应力应变关系曲线基本为稳态流动型。在应变速率为70S时,呈现较大幅的震荡现象。TC27钛合金的流动应力对变形温度的敏感性在低温变形时要显著大于在高温变形时的;对应变速率的敏感程度随变形温度的升高而降低。利用实验数据对TC27钛合金分别在700—850oC和850—1150℃温度段建立了本构方程,并具有较高的精度。通过高温变形微观组织观察。发现在变形温度高于p转变温度变形时,随变形温度提高,或应变速率降低,动态再
3、结晶数量增加。关键词高强高韧;TC27钛合金;流动应力;本构方程;微观组织中圈分类号TG3文献标志码Adoi10.39814.issn.1000—7857.2014.24.002HighTemperatureDeformationBehaviorofaHighStrengthandHighToughnessTC27TitaniumAlloyZHANGYeqin,GUZhifei,SHAAixue,HUANGLijun’,LUShiqiang1.BeijingInstituteofAeronauti
4、calMaterials,Beijing100095,China2.InnerMongoliaFirstMachineryGroupGorporation,Baotou014030,China3.SchoolofMaterialScienceandEngineering,NanchangHangkongUniversity,Nanchang330063,ChinaAbstractThehightemperaturedeformationbehaviorofTC27titaniumalloywith
5、highstrengthandhightoughnesswasstudiedthroughisothermalconstantstrain-ratecompressionexperimentsusingaGleeble3500thermo—mechanicalsimulator,whichmightDroviderefereneeforthermalprocessingofTC27titaniumalloy.Theresultsshowthatthestress—straincurvesofTC2
6、7titaniumalloyatlowtemperatureandhi【ghtemperatureroughlyCorrespondedtothesofteningtypeandsteady—state—flowtype,respectively,andsignificantshockdeclinewasobservedwhenthestrainratewas70S~.Thedependenceoftemperatureonflowstressatlowtemperaturewasmuchmore
7、significantthanthatathightemperature,andthedependenceofstrainratedecreasedwhenthetemperaturewasincreased.Basedonexperimentaldata,twohighprecisionconstitutiveequationsofTC27titaniumalloywereestablishedfortemperaturerangesof700—850oCand850—1150~C.Observ
8、ationonthemierostructureshowsthattheamountofdynamicrecrystallizedgrainsincreasedwiththeriseoftemperatureorthedecreaseofstrainratewhenthetemperaturewashigherthantransitiontemperature.Keywordshighstrengthandhightoughness;TC27titaniumalloy;flowst
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