Title of article :
The Effect of EBM Process Parameters on Porosity andMicrostructure of Ti-5Al-5Mo-5V-1Cr-1Fe Alloy
Author/Authors :
Kobiela, Karol Faculty of Mechanical Engineering - Wroclaw University of Science and Technology - Wroclaw , Poland , Kurzynowski, Tomasz Faculty of Mechanical Engineering - Wroclaw University of Science and Technology - Wroclaw , Poland , Madeja, Marcin Faculty of Mechanical Engineering - Wroclaw University of Science and Technology - Wroclaw , Poland , Dziedzic, Robert Faculty of Mechanical Engineering - Wroclaw University of Science and Technology - Wroclaw , Poland
Abstract :
Inthisarticle,theauthorsdiscusstheresultsofstudiesintotheprocessing ofTi-5Al-5Mo-5V-1Cr-1Fenear-βtitaniumalloy(Ti-55511) byelectronbeammelting (EBM), anadditivemanufacturingtechnique. Duetoitshighflexibilityinshapingmechanicalproperties,Ti-55511 alloyiscommonlyusedinaircraftcomponentssuchaslandinggearorairframes.Inthisstudy,Ti-55511 powderwasusedanditspropertiesweredescribedasregardschemicalcompositionandparticlesizedistributioninordertoassessitssuitabilityfor EBM processingandrepeatabilityofresults. 20setsofprocessingparametersweretestedintheenergyinputrangebetween10J/mm3and50J/mm3 (cathodecurrent,4.5mA-19.5mA;scanningspeed,1080mm/s–23400mm/s). Fourtypesoftopsurfaceswereobtained,namely,flat,orangepeel,withsinglepores,andwithswelling.Bestresultswereobtainedfortheenergyof30J/mm3:flattopsurfaceandrelativedensityinexcessof99.9%. Analysisofchemicalcompositionshowedthataluminumlosswasbelowthespecificationminimumfortheanalyzedparametersets.Scanningspeedmostsignificantlyaffectedaluminumcontent:thelowerthescanningspeed, thehigherthealuminumloss. Analysis of microstructuresshowed the dependenceoflamellarα-phasevolumefractionontheprocessparametersused. Forlowscanningspeed,the determinedα-phasevolumeaccountedforabout 78%. Higherscanningspeedresultedinadecreaseoftheα-phasecontentto61%. Thedimensionsofthelamellasandtheamountoftheα-phasestronglyeffectedhardnessresults (360HVto430HV).
Keywords :
EBM Process Parameters , Porosity , Microstructure , Ti-5Al-5Mo-5V-1Cr-1Fe Alloy
