Type Analysis

Description

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 substantial 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.

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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.

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.

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Workability

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 hardening range.

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.

Typical Mechanical Properties

Tensile Properties
Solution Treated: 2000°F (1093°C), 2 hours, water quenched. Stabilized: 1425°F (774°C), 4 hours , air cooled. Aged: 1350°F (732°C), 24 hours, air cooled.

Stress Rupture Strength
Solution Treated: 2000°F (1093°C), 2 hours, water quenched. Stabilized: 1425°F (774°C), 4 hours , air cooled. Aged: 1350°F (732°C), 24 hours, air cooled.

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Physical Properties

Density, lb/cu in.......................................................................... 0.294

              Mg/cu m.......................................................................... 8.14

Melting Range, °F............................................................... 2335-2455

                          °C............................................................... 1280-1345

Specific heat, Btu/lb-°F................................................................ 0.103

                       J/kg-°C..................................................................... 431

 Permeability at 200 oersted (15.9 kA/m)......................................1.013

 Coeffiecent of Expansion,  68-212°F, 10(-6) in/in-°F................... 7.50

                                             20-100°C, æm/m-°C......................... 13.50

 Electrical Resistivity, ohm-cir mil/ft............................................... 674

                                     æê-m........................................................... 1.12

Chemical Composition Limits

Weight%

Ni

Cr

Mo

Ti

Co

Cu

Mn

Si

Al

C

S

Fe

Alloy 901

42.5

12.5

5.75

2.9

1.0 max

0.5 max

0.5 max

0.4 max

0.35 max

0.1 max

0.03 max

Bal

Material

Tensile Strength ksi

Yield Strength ksi

Elongation in 4D(%)

Reduction of Area %

Hardness HB

Alloy 901

150

100

12

15

302-388

Availability:

INCOLOY 901 Plate

INCOLOY 901 Fittings

INCOLOY 901 Tube / Pipe

INCOLOY 901Bar

INCOLOY 901 Sheet

INCOLOY 901 Coil /Strap

INCOLOY 901 Fasteners / Flanges

INCOLOY 901 Powder

INCOLOY 901 Welding Product