SUPERALLOY
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Paduan logam yang memiliki kombinasi
sifat super
Sifat Super:
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Kuat , tahan korosi dan oksidasi pada T>>>
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High
creep
resistance,
high
fracture
toughness, high thermal conductivity
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High fatigue resistance, high heat resistance
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Poor forming ability, produced by casting or
powder metallurgy
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Berbasis Co, Ni, dan Fe dan unsur tambahan
seperti Nb, W, Mo, Ta, Cr, dan Ti
APPLICATION OF SUPERALLOYS
Aircraft Engine
Requirements for combustion zone
turbine Blades and related parts
Aircraft Engine
Aircraft Engine Materials
Materials Strength
CLASSES OF SUPERALLOYS
1. Ni – Based Superalloys
2. Ni – Fe Based Superalloys
3. Co – Based Superalloys
Ni-based superalloys
Ni-based superalloys
Ni-based superalloys strengthening mechanisms
The strength of pure Ni is too low for use in turbines.
Ni superalloys were developed to improve strength
properties, esp. strength at high temperature.
Three strengthening strategies
are used in Ni superalloys:
· Solid solution hardening
· Coherent precipitate
hardening
· Carbide phases on grain
boundaries
Ni- Fe based superalloys
Ni- Fe based superalloys
Co-based superalloys
Co-based superalloys
Co-based superalloys
❖ Co-based superalloys were used to a great extent in
early aircraft gas turbine engines as blades and vanes
❖ Both cast and wrought cobalt-based superalloys are
generally FCC (austenite).
Co-based superalloys