Inconel X750 Alloy
General Characteristics of Inconel X750 Alloy
Alloy 750 is a precipitation-hardening alloy that is highly resistant to corrosion and oxidation. It has good stress-rupture strength and low creep rates under high stress at temperatures up to 1500ºF (815ºC) after appropriate heat treatments.
| Chemical Analysis | |
|---|---|
| C | Carbon 0.08 max |
| Mn | Manganese 0.30 max |
| S | Sulfur 0.010 max |
| Si | Silicon 0.50 max |
| Ni(+Co) | Nickel Cobalt 70 min |
| Cr | Chromium 14.0/17.0 |
| Co | Cobalt 1.00 max |
| Cu | Copper 0.50 max |
| Al | Aluminium 0.40/1.00 |
| Fe | Iron 5.00/9.00 |
| Ti | Titanium 2.25/2.70 |
| Cb + Ta | Columbium + Titanium 0.70/1.20 |
Applications
The alloy finds applications as high-temperature structural members for gas turbines, jet engine parts, nuclear power plants, heat-treat fixtures, forming tools and extrusion dies.
Forging
Forge stock should be heated to a furnace temperature of 2100ºF (1150ºC) to start-forge at 1950/2000ºF (1065/1095ºC.) For service below 1100ºF (595ºC) higher strength may be obtained by some cold work and heat treatment.
Heat treatment
Several heat treatments are available, and are used according to the application requirements. Two treatments are as follows:
For maximum creep, relaxation and rupture strength at service temperatures above 1100ºF (595ºC):
Solution treat at 2100ºF (1150ºC) for 2-4 hrs and air cool
Intermediate age at 1550ºF (845ºC) for 24 hrs and air cool
Final age at 1300ºF (705ºC) for 20 hrs and air cool
For maximum room temperature yield strength and ductility:
Stress equalization at 1625ºF (885ºC) for 24 hrs and air cool
Precipitation age at 1300ºF (705ºC) for 20 hrs and air cool
Machinability
The alloy is austenitic and work hardens rapidly. As such positive feeds are required, together with sharp, rigid tooling and equipment. Inconel 718 is best machined in the stress-equalized condition.
Weldability
The alloy should preferably be welded in the stress-equalized condition and solution annealed and age hardened following welding.
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