Incoloy 901

Chemical composition % of the ladle analysis of grade Incoloy 901 and Standards

General Characteristics of Incoloy™ 901
With a high creep and rupture strength to 1400°F (760°C), Incoloy™ 901is a nickel-iron-chromium alloy ideally suited for gas turbine and aircraft applications. Because of its high nickel content, it can be joined with ferritic Alloy steels without thermal expansion provisions.

Chemical Composition of Incoloy™ 901
Carbon 0.05
Manganese 0.48
Silicon 0.22
Chromium 12.8
Molybdenum 5.7
Titanium 2.4
Iron 35
Nickel 43
Heat Treatment of Incoloy™ 901
Anneal by holding at 2050°F (1121°C) for 2 hours before water quenching
Age by holding at 1375°F (746°C) for 24 hours before air cooling; expect approximately 0.1% contraction
Applications of Incoloy™ 901
Gas turbine parts, including rotor and compressor discs, and structural components
Aircraft applications
Machinability of Incoloy™ 901
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
Workability of Incoloy™ 901
Hot and cold
Forge between 2050°F (1121°C) and 1850°F (1010°C)
1600°F (871°C) minimum temperature for light working without bending or tensile stress
Avoid exposure to sources of sulfur and sulfurous atmospheres

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Machining performance

Incoloy 901 the mechanical properties of the report, the report provides detailed performance analysis and application.
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Principal Design Features

One of the most widely used precipitation hardening grades in the business. While soft and ductile in the solution annealed condition, it is capable of high properties with a single precipitation or aging treatment. Characterized by good corrosion resistance, high harness, toughness and strength.

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Machinability

Long, gummy chips characterize this alloys machinability. It can be machined in the annealed condition, however condition H1150M will yield best results. Post machining solution treatment of parts will be required prior to final hardening if machining in this condition.

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Heat Treatment

CONDITION A--Soak at 1900 F (1038 C) for 30 minutes and cool below 60 F (16 C) for complete martensite transformation. CONDITION H 950- Treat Condition A material at 900 F(482 C) for 1 hour, air cool.. CONDITION H925, H1025, H1075, H1100, H1150- Soak solution treated material for 4 hours at specified temperature, air cool, CONDITION H1150M- Soak solution treated material at 1400 F (760 C) for 2 hours, air cool, then re-heat to 1150 F (620 C) for 4 hours and air cool.

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Welding

Successfully welded by common fusion and resistance methods, this alloy should not be joined by oxyacetylene welding. AWS E/ER630 filler metal is recommended if required.

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Forging

Soak for 1 hour at 2150 F (1177 C) prior to forging. Do not work below 1850 F (1010 C). Post-work solution treatment is required prior to final hardening.

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