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Metals 2016,6, 284
Figure7.XPSsurveyspectra for (a) the20mmEBM-builtTi64sampleand(b) theTi64powder.
Figure8.XPSspectraof the (a)Ti2ppeakand(b)O1speakonthesurfaceof the20mmEBM-built
Ti64sample.
3.3.DrySlidingWearBehaviour
Therepresentativecoefficientof friction(COF)curvesaredisplayedinFigure9a. Similarwear
characteristicswereobserved, regardlessof thedifferentmicrostructuresexisted inside theEBM-built
andtheas-cast samples. In the insert showninFigure9a, it isnotedthat thewearcharacteristicsof the
Ti64samplecanbeclassifiedinto fourmajorstages:
(I) Wearing-in period,where the friction coefficient increases rapidlywhen the ball is in direct
contactwith theoxide layerofsamplesurface.
(II) Cushioningof theoxide layer,which ischaracterizedbyaslightdecrease inCOF,probablydue
tosurfaceoxide thatpreventsdirectmetal-metal contactbetweentheballandtheTi64sample.
(III) Breakageof theoxide layer into fragments,whichwas indicatedbyasignificant increase inCOF.
In this stage, theoxidedebrisgeneratedwere fragmentedasaresultof repeatedcyclesof stress
andloadduringsliding. This, coupledwith thecompleteremovalof theoxide layer,allowsthe
directmetal-metal contactand,assuch,causes the increase inCOF.
(IV) StabilizationofCOF,whichoccursafter~10,000 laps.
45
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3D Printing of Metals
- Title
- 3D Printing of Metals
- Author
- Manoj Gupta
- Editor
- MDPI
- Location
- Basel
- Date
- 2017
- Language
- English
- License
- CC BY-NC-ND 4.0
- ISBN
- 978-3-03842-592-2
- Size
- 17.0 x 24.4 cm
- Pages
- 170
- Keywords
- 3D printing, additive manufacturing, electron beam melting, selective laser melting, laser metal deposition, aluminum, titanium, magnesium, composites
- Categories
- Naturwissenschaften Chemie