一种钛合金中等轴与片层α相复杂粘连组织分割的新方法.pdf

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1、Availableonlineat、^n^n^，．sciencedirect．cornTransaetionsofcienceDirectNonferrousMetalsSocietyofChinaPressTrans．NonferrousMet．Soc．China23(2013)2265—2269WWW．tnmsc．cnAnewmethodforseparatingcomplextouchingequiaxedandlamellaralphaphasesinmicrostructureoftitaniumalloyZheJI，HeYANG，Hong-we

2、iLI，Xiao—guangFAN●StateKeyLaboratoryofSolidificationProcessing，SchoolofMaterialsScienceandEngineering，．●一●NorthwesternPolytechnicalUniversity，Xi’all710072，China。●，Received21June2012；accepted15October2012SAbstract：Anewmethodforseparatingcomplextouchingequiaxedandlamellaralphaphases

3、intheopticalmicrographoftitaniumalloywasproposedforquantitativecharacterization．Thisnewmethodinvolvesthreesteps．First，concavepointsofthemicrostructuralfeatureareidentifiedwithathresholdoftheconcavenessofthecomerpointswhichareextractedfromthebinarizedimage．Secondly，concavepointspai

4、rsareselectedfromtheconcavepointsgroupestablishedbymeansofmarkercircleordistance．Third．whetheracandidateseparationlinewhichconnectstwoconcavepointswiminapaircanbeacceptedornotisdeterminedbytheproposedfourrules．Theobtainedresultsshowthatthismethodisefectiveonseparatingcomplextouchi

5、ngmicrostructuralfeatures．Keywords：titaniumalloy；microstructuralfeature；separationmethodfeaturesautomatically．Inthefieldofimageprocessing，1IntroductionthethresholdofgrayvaluewasusuallyusedasaneffectiveparameterforseparatingtheprimaryandTitaniumalloyshavebeenwidelyusedinthesecondar

6、yalphatexturesinaduplexmicrostructureaerospacefieldduetotheirhighspecificstrength，good『7—91．However，differentgrayvaluesbetweenequiaxedcorrosionresistanceandexcellenthightemperatureandthicklamellaralphamaynotberemarkable．perfcIrmance『1，21．TheseexcellentcomprehensiveTherefore，inthep

7、resentwork，anewmethodbasedpropertiesdependonoptimalcombinationofequiaxedondigitalimageanalysiswasproposedtoseparateandlamellaralphaphases．Ingeneral，equiaxedphasetouchingequiaxedalphaandthick1amellaralphainashowssuperiorductilityandthermalstability，whiletri—modalmicrostructuref101o

8、ftitaniumalloys．lamellarphaseshow