Comprehensive Guide to Nickel-Based Superalloys: Incoloy 901 (UNS N09901)
What is Incoloy 901?
The Cr content of the nickel-based alloy Incoloy 901 is usually 11.0-14.0%, and the nickel content is 40.0-45.00%. Incoloy 901 alloy is a nickel-based alloy containing molybdenum and copper, with good hot and cold working properties. Incoloy901 is an au stainless steel age-hardening alloy based on Fe-43Ni-12Cr, with the addition of strengthening elements such as titanium, aluminum and and a small amount of boron and relatively low carbon. It is a metastable γ" [Ni3(Ti,Al)] phase dispersion strengthened, and a small amount of aluminum can inhibit the transformation of γ" to η-Ni3Ti phase.
Incoloy 901 alloy has high yield strength and endurance strength below 650℃, good oxidation resistance below 760℃, and stable organization for long-term use. This alloy is a relatively mature alloy developed in the early stage. Widely used in the manufacture of rotating disks (turbine disks, compressor disks, journals, etc.), static structural parts, turbines for aviation and ground gas turbine engines with operating temperatures below 650°C. Outer ring and other parts Fasteners.
Standard stock specifications:
UNS N90901
AMS 5660
AMS 5661
B50A305B
Wextorf 2.4662
According to DIN 1.4898
AISI 681, 68
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)
This alloy is widely used abroad for rotating parts and fasteners on aircraft engines and ground gas turbines with operating temperatures below 650℃, and has a long service life. It has also been applied to aircraft engines in my country. It is a mature alloy that has passed the use test. Alloy forging is advanced. If the process parameters are not selected or operated properly, its performance will show obvious directionality and may cause notch sensitivity, but as long as the process is strict, this phenomenon will not occur. The expansion coefficient of the alloy is close to that of ferritic heat-resistant alloy steel, so the two materials can be connected without special requirements for the calorimeter.
Heating pipes, containers, baskets and chains used in sulfuric acid pickling plants.
Seawater cooling heat exchangers, marine products Piping systems, sour gas environment pipelines.
Heat exchangers, evaporators, scrubbers, dip tubes, etc. in phosphoric acid production.
Air heat exchangers in petroleum refining.
Food engineering, chemical processing.
Flame-retardant alloys for high-pressure oxygen applications.
Heat exchange tubes
Pipe fittings
Flanges
Valves
