NIMONIC Alloy 91

Jul 10 2013

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Fabrication
     Machinability
     Hot working
     Annealing
Applications

Introduction

NIMONIC alloys consist of nickel and chromium, with the nickel content more than 50%. These alloys exhibit high-temperature low creep and are high performance alloys. Additives like titanium and aluminium increases the strength of the alloy. The commercially available NIMONIC alloys are NIMONIC 75, NIMONIC 80A, 81, 86 and NIMONIC PE11 and 16.

NIMONIC alloy 91 is a wrought nickel-chromium-cobalt alloy that has similar characteristics as that of NIMONIC 90. Titanium and aluminium are added as additives to this alloy. This alloy has increased chromium content for enhanced corrosion resistance in salty and sulphur-based environments. The alloy provides long service for temperatures up to 900°C. The alloy exhibits excellent strength, ductility and stable microstructure.

This datasheet will look into the chemical composition, properties and applications of NIMONIC alloy 91.

Chemical Composition

The chemical composition of NIMONIC alloy 91 is given in the following table.

Element Content (%)
Nickel, Ni 39.9-50.798
Chromium, Cr 27-30
Cobalt, Co 19-21
Titanium, Ti 1.9-2.7
Iron, Fe ≤1.0
Aluminum, Al 0.90-1.5
Others Remainder

Physical Properties

The following table discusses the physical properties of NIMONIC alloy 91.

Properties Metric Imperial
Density 8.08 gm/cm3 0.292 lb/in3

Mechanical Properties

The mechanical properties of NIMONIC alloy 91 are tabulated below.

Properties Metric Imperial
Tensile strength(annealed) 96 MPa 13.9 ksi
Yield strength(annealed) 59 MPa 8.5 ksi
Elongation at Break 21.60% 21.6
Modulus of Elasticity 132 GPa 19100 ksi

Fabrication

Machinability

This alloy must be machined after being fully heat treated.

Hot working

NIMONIC alloy 91 can be hot worked at temperature ranges of 950-1175°C (1742-2147°F).

Annealing

For NIMONIC alloy 91 interstage annealing should be carried out at a temperature of 1150°C (2102°F). The annealing process should be followed by free cooling in air or in fluidized bed quenching.

Applications

The NIMONIC alloy 91 is used in the following applications:

  • Gas turbine valves and blades
  • Marine environments
  • Burning impure fuels.

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