GTD 111(Ni-Cr-Co-W-Ta)

1. Introduce

– Super heat-resistant alloy for casting

– Used as a material for turbine blades of 1st to 3rd stages of F-class (TIT 1350℃ class) large power generation gas turbines

– Precipitation strengthened Ni-based superalloy containing Mo, Co, W, Ta, Cr refractory elements

– An alloy developed by GE by modifying Rene80, a material used in aircraft engines, as a material for gas turbine blades for power generation

– Creep fracture properties are about 20°C better than IN-738LC alloy, the most widely used gas turbine blade material for power generation

– Alloy with high Ti content among Ni-based super heat-resistant alloys

* GTD 111 vs Rene 80

– Similar in major chemical constituents Ni, Cr, Co, Ti, and A

– Different chemical composition of Mo, C, Ta

– Mo : GTD 111 contains approximately 2% less Mo than Rene 80

– C : GTD 111 contains about 0.1% less compared to Rene 80

– Ta : not added in Rene 80, GTD 111 contains approximately 2.5 to 3.1%

* GTD 111 vs IN-738LC

– GTD 111 has replaced IN-738LC, the previous material for high-power gas turbines operating at high temperatures, due to its excellent high-temperature properties

– Similar microstructure, corrosion resistance, and applications

– GTD 111 creep fracture temperature : 871℃ or higher
(Above 871℃, fracture occurs by a combination of surface cracks and internally grown cracks)

* TIT(Turbine Inlet Temperature)

– Turbine inlet temperature of gas turbine

– Gas turbine performance improves as the turbine inlet temperature increases

2. Property

– High temperature strength, creep properties, fire resistance, thermal fatigue properties, oxidation and corrosion resistance

[GTD 111 Chemical Composition (%)]

[GTD 111 Mechanical Properties]

[GTD 111 Physical Properties]

3. Standard & Specification

4. Available Form

– Bar, Rod

– Sheet, Plate

– Coil, WIre

– Billet

5. Application & Product

– Aerospace

(1) Turbine Blades / (2) Aircraft Engines / (3) Nozzles / (4) Vanes