Super Alloy INCONEL MA754 (UNS N07754)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
     Machinability
     Welding
     Hot Working
     Cold Working
Applications

Introduction

INCONEL MA754 is an oxide dispersion strengthened, nickel-chromium super alloy. It is produced by mechanical alloying. Mechanical alloying involves high-energy milling of metal powders to produce a uniformly distributed, fine dispersoid of yttrium oxide in the alloy.

The following section explains in detail about super alloy INCONEL MA754.

Chemical Composition

The chemical composition of INCONEL MA754 is outlined in the following table.

Element Content (%)
Nickel. Ni 78
Chromium, Cr 20
Iron, Fe 1
Aluminum, Al 0.3
Titanium, Ti 0.5
Yttrium oxide, Y2O3 0.6
Carbon, C 0.05

Physical Properties

The physical properties of INCONEL MA754 are tabulated below.

Properties Metric Imperial
Density 8.30 g/cm3 0.300 lb/in3
Melting point 1400°C 2550°F

Mechanical Properties

The following table shows mechanical properties of INCONEL MA754.

Properties Metric Imperial
Tensile strength 950 MPa 138000 psi
Yield strength 570 MPa 82700 psi
Elastic modulus 203 GPa 29.4 ksi
Elongation at break 20% 20%

Thermal Properties

The thermal properties of INCONEL MA754 are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (@0.000-100°C/32-212°F) 12.2 µm/m°C 6.78 µin/in°F
Thermal conductivity 14.3 W/m°C 99.14 BTU in/hr.ft².°F

Fabrication and Heat Treatment

Machinability

INCONEL MA754 is readily machined using all the conventional processes.

Welding

Brazing is commonly used to weld this alloy. Laser and electron beam welding is also used. Using the conventional TIG welding can lead to reduced high temperature stress rupture strength at the joint.

Hot Working

INCONEL MA754 can be hot worked into any desired shape; however this can be done before grain coarsening final annealing.

Cold Working

INCONEL MA754 can be easily cold worked.

Applications

INCONEL MA754 is chiefly used in applications where high temperature creep resistance and corrosion resistance are required.

INCONEL MA754 is also used in the following:

  • Gas turbine engine components
  • Furnace fixtures
  • Skid rails
  • Fasteners

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