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Superalloys
Superalloys
Superalloys
Superalloys
Superalloys
Superalloys
Superalloys
Superalloys
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Superalloys

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  • 1. SuperalloysProperties and Applications
  • 2. ContentsClassification ofSuperalloysPropertiesApplicationsApplication in Oil-Gas sector Turbine blades made up of nickel superalloy
  • 3. Classification of Superalloys• These alloys have austenitic FCC structure which have base alloying element of nickel, cobalt and iron.• Further they are classified on the basis of pre- dominant element present in it.• Alloying elements are Fe, Co, Ni, Cr, W (tungsten), Mo (molybdenum), Nb (niobium) and Ta (tantalum).• Iron based alloys:(a) 9-38 % nickel(b) 15-22 % chromium(c) 32-67 % ironCommon type of Iron based alloy is Incoloyseries.
  • 4. • Cobalt based alloys:(a) Up to 35% nickel(b) 19-30 % chromium(c) 30-65 % cobaltCobalt based alloys can retain their strength athigh temperature but they are not as strong asnickel based alloys.
  • 5. • Nickel based alloys:(a) 38-76% nickel(b) Up to 27 % chromium(c) Up to 20 % cobalt.Some of the common type of nickel based alloysare Nimonic, Hastelloy and Inconel.These are the most common types ofSuperalloy which are widely used in turbineblades
  • 6. Properties of Superalloys• Excellent mechanical strength and wear resistance at high temperature.• Resistance to corrosion and oxidation at very high temperature.• Good surface stability.
  • 7. Applications of Superalloys• In Aerospace : blades of turbines and in jet/rocket engines.• In Marine : wide use in Submarines.• In Chemical processing industries.• Heat exchanger tubing• Industrial gas turbines• Nuclear Reactors

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