AA6061铝合金管材热态气压成形性能及微观组织

《AA6061铝合金管材热态气压成形性能及微观组织》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、塑熟万方数据Availableonlineatwww。sciencedirect。com·乏：，ScienceDirectPressTrans．NonferrousMet．Soc．China22(2012)s364一s369TransactionsofNonferrousMetalsSocietyofChinawww．协msc．cnFormabilityandmicrostructureofAA6061A1alloytubeforhotmetalgasformingatelevatedtemperatureHEZ

2、hu-binl，FANXiao-b01，SHAOFeil’，ZHENGKai—lunl，WANGZhi．bia01，YUANShi-jianl1．NationalKeyLaboratoryforPrecisionHotProcessingofMetals，HarbinInstituteofTechnology,Harbin150001，China；2．LuoyangShipMaterialResearchInstitute，ChinaShipbuildingIndustryCorporation(CSIC)，Lu

3、oyang471039，ChinaReceived28August2012；accepted25October2012Abstract：Freebulgingtestwascarriedoutatdifferenttemperaturesrangingfrom350oCto500。CtoevaluatetheformabilityofAA6061extrudedtube，whichcanprovidetechnologyfoundationforcomplexstructuresforminginhotmetal

4、gasforming(HMGF)process．Maximumexpansionratio(MER)andburstingpressurewereobtainedtoevaluatedirectlytheformabilityatheatedconditions．Vickershardnessatdifferentpositionswasmeasured．Thefracturesurfaceafterburstingwasobservedwithscanningelectronmicroscope(SEM)，an

5、dthemicrostructurechangealongaxialandhoopdirectionswasanalyzedbyelectronbackscatteringdiffraction(EBSD)．TheresultsshowthatthelargestMERvalueis86％at425。C．Burstingpressuredecreasesfrom4．4MPato1．5MPawithtemperatureincreasing．TheVickershardnessoffracturepositioni

6、salittlehigherthanotherpositionsaftergasbulging．Thefracturemechanismisstillthemicro-poreaggregationfractureatelevatedtemperature，whileoverheatedstructureappearsseriouslyat500。C．Theinitialfineequiaxialgraingrowsastemperatureincreases，whichiselongatedsimultaneo

7、uslyinbothaxialandhoopdirections．Keywords：aluminumalloytube；freebulgingtest；hotmetalgasforming；formability；microstructure；fracturemorphology；grainmorphology1IntrOductiOnWeightreductionhasbecomeoneoftheresearchfocusesinthefieldofmaterialsprocessing．whichcanber

8、ealizedbyoptimizedstructuraldesignandusageoflightmaterials『11．Partwithirregularcross—sectionsismanufacturedbyusing1ightmaterialandoptimizedstructure．whichhasobtainedmoreandmoreapplication