Incoloy 901

Incoloy 901 -a nickel-iron-chromium alloy containing titanium and aluminum for precipitation hardening and molybdenum for solid-solution strengthening. The alloy has high yield strength and creep resistance at temperatures to about 1110°F (600°C). A subtantial iron content enables the alloy to combine high strength with good forging characteristics. Used in gas turbines for discs and shafts. Standard products form is round.

Incoloy 901 Corrosion Resistance

Alloy 901 has good corrosion resistance to the atmospheres normally found in jet engine operations. It has slightly lower scaling resistance than such alloy as Types 309 and 310 stainless steel.

Incoloy 901 Hot Working

Alloy 901 is forged between 2050°F (1121°C) and 1850°F (1010°C), metal temperature. Light hot work may be continued down to 1600°F (871°C) but not below. Metal temperature should not exceed 2050°F (1121°C) during rapid working. Billets should be charged into a hot furnace and heated rapidly through the precipitation hardeningrange.

Incoloy 901 Weldability

Alloy 901 can be welded by the inert-gas-arc method. It is difficult to weld. All welding should be done in the solution treated condition. Cold worked parts should be re-solution treated before welding. A re-solution treatment is recommended after welding before stabilizing and aging.

Incoloy 901 Chemical composition:

Incoloy 901 Heat Treatment

Solution Treatment
1975/2025°F (1080/1107°C), hold 2 hours at heat, and water quench.
Stabiliztion Treatment
1400/1475°F (760/802°C), hold 2 to 4 hrs, and air cool.
Precipitation Hardening Treatment
1300/1375°F (704/746°C), hold for 24 hours, and air cool.

Incoloy 901 Machinability

• Use high-speed steel tools and cutting fluid
• Cut at 180 sfpm
• Use cobalt high-speed cutting tools with heavy feeds and slow speeds
• Grind high speed steel roughing tools to 8° side and back rake, 4-6° side clearance, 6-8° end clearance, 15-25° side cutting-edge angle, 1/32” nose radius
• 15-35 sfpm surface cutting speeds with 1/16-1/32” deep cuts and 0.010-0.015 in./rev. feed
• Finishing cuts to 35 sfpm; clorinated and sulfurized cutting oils
• Cemented carbide tools
  • 30 to 60 sfpm
  • 0° to 5° back rake
  • 5° side rake
  • Chemical-active water soluble lubricants or plain soluble oil and water or lubricants

Incoloy 901 Physical properties: