What is Incoloy 901?
The Cr content of iron‑nickel based superalloy Incoloy 901 is typically 11.0–14.0%, with nickel ranging 40.0–45.0%. Incoloy 901 is a precipitation‑hardening austenitic alloy based on Fe‑43Ni‑12Cr, alloyed with molybdenum, titanium, aluminum, trace boron and low carbon. It gains strength from dispersion of metastable γ' [Ni₃(Ti,Al)] precipitates; minor aluminum additions suppress the transformation of γ' to η‑Ni₃Ti phase.
Incoloy 901 maintains high yield and stress‑rupture strength below 650°C, alongside good oxidation resistance up to 760°C and stable microstructure for long‑term service. This early‑developed, well‑validated alloy is widely manufactured into rotating components including turbine disks, compressor disks and shafts, static structural parts and fasteners for aviation & land‑based gas turbines with service temperatures ≤650°C.
Standard stock specifications:
UNS N09901
AMS 5660
AMS 5661
DIN W.Nr. 2.4662
Common trade names:
Incoloy 901 (USA)
Nimonic 901 (UK)
Z8NCDT42 (France)
2.4662 (Germany)
GH901 (China)
Heat treatment Nickel-based alloy incoloy system Heat-resistant nickel-based alloy 901 (UNS N09901):
Solution treatment
1975/2025°F (1080/1107°C), heat for 2 hours, then water quench.
Stabilization treatment
1400/1475°F (760/802°C), hold for 2 to 4 hours, then air cool.
Precipitation hardening treatment
1300/1375°F (704/746°C), hold for 24 hours, then air cool.
Melting and casting process of nickel-based alloy Incoloy Heat-resistant nickel-based alloy 901 (UNS N09901)
The alloy is produced by vacuum induction and vacuum arc remelting dual process, or vacuum induction and electroslag remelting process.
Processing properties of nickel-based alloy Incoloy 901 (UNS N09901)
Hot working
Alloy 901 is forged between 2050°F (1121°C) and 1850°F (1010°C) metal temperatures. Light hot working may continue to 1600°F (871°C), but not below. Metal temperature during rapid working should not exceed 2050°F (1121°C). The billet should be charged into a hot furnace and rapidly heated to the precipitation hardening range.
Weldability
Alloy 901 can be welded by inert gas arc method. It is difficult to weld. All welding should be carried out in solution treatment conditions. Cold-worked parts should be re-solution treated before welding. It is recommended to re-solution treat after welding before stabilization and aging.
Application Field Nickel-Based Alloy Alloy 901 (UNS N09901)
Incoloy 901 (UNS N09901) is an iron‑nickel based precipitation‑hardening superalloy engineered for high‑strength service at elevated temperatures. Its typical applications cover aviation and land‑based gas turbine systems: rotating components such as turbine disks, compressor disks and shafts; static structural rings, casings and high‑strength fasteners for parts with continuous service temperatures up to 650°C.
FAQ:
What is the difference between Inconel and INCOLOY?
Both Inconel and Incoloy are trademarked families of high-performance nickel-based superalloys. The core difference is their chemical composition: Inconel contains over 50% nickel for extreme high-temperature strength, while Incoloy contains less than 50% nickel with a higher iron content, making it more cost-effective for moderate heat and acid resistance.
What kind of alloy is Inconel?
Inconel is a family of austenitic nickel-chromium-based superalloys. It also contains smaller amounts of other elements like iron, molybdenum, and niobium, making it highly resistant to extreme heat, pressure, and corrosion.
Is Hastelloy the same as Inconel?
No, Hastelloy and Inconel are not the same. Both are brand names for high-performance nickel-based "superalloys" designed for extreme environments, but they have different chemical makeups and primary uses. Inconel is made by Special Metals Corporation, while Hastelloy is made by Haynes International.
