Page - 60 - in 3D Printing of Metals

Metals 2017,7, 91 3.ResultsandDiscussion In this study, partswere built using two additivemanufacturing processes. To characterize the influenceof theprocesses, of theorientationandofaheat treatmentof thepartonmechanical properties, thegeometricaldimensionsaswellas theorientation in thebuildingprocesswasvaried. Theobtainedresultsarepresentedanddiscussed in the followingchapter. 3.1. Cross-SectionAccuracyofFabricatedStruts Table 4 lists the results of themanufactured andmeasured SLM- andEBM-processed parts. Figure 9 shows the estimated equivalent diameters and Figure 10 shows the inner and external diametersof theSLMandEBMparts independenceondiameterandorientation. Table4.Results fromdeterminationsof theequivalentdiameter (n=10foreachpart). dCAD–Orientation EBM(μm) SLM(μm) 1.1mm0◦ 995±7 1057±7 1.1mm45◦ 949±14 1063±14 1.3mm0◦ 1148±48 1235±17 1.3mm45◦ 1155±30 1299±16 1.5mm0◦ 1314±32 1436±22 1.5mm45◦ 1358±47 1486±8 1.7mm0◦ 1505±21 1640±9 1.7mm45◦ 1538±38 1646±10 AllSLMpartshavesmallerequivalentdiametersthantheCADtargetspecifications. Inallvariants, thecomponentsfromtheSLMprocessarecloser tothetargetspecificationthantheEBM-manufactured parts. Althoughusing a scaling factor to obtain theproper geometries in accordance to theCAD specifications, theEBMpartsdifferbetween10%and12%fromtheCADdataspecifications in the zerodegreeorientation. In the45-degreeorientation, thedeviation is 9%to14%. SLMcomponent deviations in thezero-degreeorientationarebetween4%and5%while thedeviations in the45-degree orientationarebetween0%and3%. SLMcomponentsshowminordeviations. Figure 9. Estimated equivalentdiameters of SLMandEBMparts independenceondiameter and orientation.Resultsareshownasmeanvalueswith thecorrespondingstandarddeviations (n=10for eachdesign). 60