Super Alloy INCONEL MA758

Topics Covered

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

Introduction

Super alloys are high performance alloys that are known for their excellent mechanical strength and resistance to creep at elevated temperatures, good surface stability, and good corrosion and oxidation resistance.

Super alloy INCONEL MA758 is an oxide-dispersion strengthened nickel-chromium super alloy that is made by mechanical alloying. High-temperature strength is improved due to the use of yttrium oxide for dispersion strengthening.

The following section explains in detail about super alloy INCONEL MA758.

Chemical Composition

The chemical composition of INCONEL MA758 is outlined in the following table.

Element Content (%)
Nickel. Ni 67.55
Chromium, Cr 30
Iron, Fe 1
Yttrium oxide, Y2O3 0.60
Titanium, Ti 0.5
Carbon, C 0.050
Aluminum, Al 0.3

Physical Properties

The physical properties of INCONEL MA758 are tabulated below.

Properties Metric Imperial
Density 8.14 g/cm3 0.294 lb/in3
Melting point 1375 °C 2507 °F

Mechanical Properties

The following table shows mechanical properties of INCONEL MA758 (bar) alloy.

Properties Metric Imperial
Tensile strength 173 MPa 25100 psi
Yield strength 151 MPa 21900 psi
Elongation at break 22% 22%

Thermal Properties

The thermal properties of INCONEL MA758 are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (@0.000-100°C/32-212°F) 12.47 µm/m°C 6.928 µin/in°F

Fabrication and Heat Treatment

Machinability

INCONEL MA758 is readily machined in the fully recrystallized condition and has similar machining characteristics to solution-annealed INCONEL 718. Ordinary sulfurized mineral oil can be used for this process. Water-based coolants are recommended for use in high-speed operations such as milling, turning, and grinding.

Welding

INCONEL alloy MA 758 is weldable. Mechanical fastening methods such as bolting and riveting are commonly used for joining INCONEL alloy MA 758 to itself and to other alloys.

Hot Working

INCONEL MA758 is readily fabricated and can be hot formed into variety of desired shapes for use in thermal processing applications.

Applications

INCONEL MA758 is used in the following application areas:

  • In fuel atomizer application in diesel engines
  • Components used in heat-treatment processes such as furnace skid rails, jigs, hearth rollers, and tools.

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