in gas turbine various materials are used such as titanium alloys ,nickel alloys ....these materials having properties which makes them suitable for gas turbine

1. By
Abhijeet sheelvant
1SJ17AE002
Gas turbine materials and properties

2. GAS TURBINEMATERIALS
 Gas turbine: dude which materials suits for me?
 Me : Titanium alloy , Ni-based super alloy , stainless
steel,cobalt based super alloy , iron based alloy ,
Rene 41,77,100.......,PMC , CMC, .......
 GT: can u brief about these materials?
 Me: sure, shall we proceed...
 GT:sure....

3. Dude see this.......

4. Titanium alloy and its proerties
 High strength to wt ratio
 600°C is its temp limit
 (3-33%)
 Ti -6AI-4V IN SR COMPONENTS AND ALLOY
685 IN EURO AERO ENGINES
 ALLOY 834 IN COMPRESSOR DISC IN RR
 TI +SMALL AMOUNT OF Si =CREEP
RESISTENCE
Which is used for blade discs and rotor @temp
upto 540°C

5. Combustion chamber
 Challenge: improvement of high tempr creep
rupture strength without sacrificing the oxidation
and CR
 Nimonic 263 higher creep strength
 HA -188, a cobalt based super alloy improved
creep strength
 Ni based super alloy 617 & 230 (combustor
components)
 Liners and transition pieces are given a thermal
barrier coating (insulating and protecting the
base material)

6. Turbine materials
 Challenges : high temp..creep and oxidation resistant
 Wrought alloy with increse level of al based alloy(
prob-forge)
 A286,an austenitic iron base alloy and super alloy 718
used in a/c engine for many yrs
 Cast Ni based alloy due to high temp strength
 Rene XX –having hi chromium (=so high cr and temp)
 to avoid nucleation and cavity growth ds alloy used ,it
improved the turbine balde material capability by 14°C
 And for nozzle parts cobalt base alloy used for high
strength @ high temp

7. Nozzle, vane and coatings
 And for nozzle parts cobalt base alloy used for
high strength @ high temp
 ODS SUPER ALLOY for vanes
 MA754 BY GENERAL ELECTRIC as vane
material due to high strenth @ hT
 For coating
Aluminide coating ,overlay coatings and TBCs

8. Future materials under R&D
 Ceramics : due to high temp compatibility
 40% relatively lighter than high
temp alloy
cost also less
INTERMETALLICS: low density
prob:fracture toughness and
resisteence to fatigue
PMC in cold section of jet engine, ti based mmc are
used extensively due to red in wt

9. GT: why r these materials suits for me?
Me : because u needs the following properties and
they fulfill them and they are:
 Ability to withstand at elevated temp
 High strength to wt ratio and substantial wt
reduction
 Fatigue and creep resistence
 Oxidation and hot corrosion resistence

11. summary
Thank you...