Tailoring Properties of Parts - IMTEX · 2/20/2019 Copyright : Imaginarium India Pvt. Ltd ,2019...
Transcript of Tailoring Properties of Parts - IMTEX · 2/20/2019 Copyright : Imaginarium India Pvt. Ltd ,2019...
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D101
Guruprasad.K.RaoDirector & Mentor
Tailoring Properties of Parts made by Additive Manufacturing
BIEC Bengaluru 28 January 2019
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Additive manufacturing, where material is
deposited and bonded layer by layer
sequentially, is by its very nature a good
match for the manufacture of components
with changes in property built-in.
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Functionally graded materials
are ubiquitous in nature
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Skin Structure
Dental Crown
Bamboo Tree
Bone Structure
Dinosaur Bone
Structure
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Composite▪ Sharp interface,
▪ Risk of delaminating,
▪ Weakness and strength everywhere.
FGM
▪ Smooth transition, very good bond,
▪ Volume properties distribution,
▪ Specific material adaptation.
The whole part is a bit ductile and a bit hard, homogenously.
This region is largely hard
This region is largely ductile
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FGM types.
Based on Phases Based on ApplicationsBased on Gradient
Ceramic/Metal, Ceramic/Ceramic, Metal/Metal, Ceramic/Plastic. Composition, Optical, Fine, etc.
Aerospace, Defense, Automotive, Molding, Mining, etc.
Properties of FGM’s can be described by the function f(x).
Fig. 3. Structure: (a.) Homogenous Materials, (b.) Junction Type, (c.) FGM’s.
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Chemical CompositionGradient
MicrostructureGradient
PorosityGradient
▪ Composition of material is varied from one material into the other.
▪ Different phases that are produced depends on the compositional
quantity and reinforcing material.
▪ Porosity is made to change with spatial position in the bulk
material.
▪ Pore size gradation can be achieved by varying the powder particle sizes.
▪ Surface of the material isquenched, during solidification
process.
▪ Core of the same material is allowed to cool slowly to produce
different microstructures
Flow of
liquidmetal
Flow of
cooling water
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Potential material composition/ property transitions
Douglas C. Hofmann et al https://doi.org/10.1557/jmr.2014.208
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Secondary electron SEM image of a graded lattice. Numbers
1– 3 correspond to the smallest to the largest strut thickness
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Post-processing using ultrafast pulsed lasers to improve the
surface finish of 3D-printed parts originally created with LAM.
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Co-29Cr-6Mo alloy femoral knee implant
fabricated by EBM.
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PROCESSING ROUTES FOR FGM.PROCESSING TECHNIQUES OF THIN FGM
Physical Vapor Deposition (PVD) and Chemical Vapor
Deposition (CVD) .
Plasma Spraying
Self-propagating High temperature synthesis (SHS). Ion Beam Assisted Deposition
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PROCESSING ROUTES FOR FGM.
PROCESSING TECHNIQUES OF THICK FGM
Centrifugal Casting.
Solid Freeform Fabrication (SFF). Laser Metal Deposition (LMD).
Thermal Spraying.
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APPLICATIONS.
POWER GENERATION
Steam Turbine Section.
Steam Valves.
Preferable FGM.
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APPLICATIONS.AEROSPACE
FGM’s for Turbine Blade Manufacturing.
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APPLICATIONS.BIOMEDICAL
Functionally graded implant in orthopedics.
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APPLICATIONS
MINING
Ductile and sufficiently deformation resistance towards high loading
Very hard surface with high ceramic content in ductile matrix.
METAL WC
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Driving Benefits.
Existing Component.
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