Alloy Rene 41
| Chemical Analysis | |
|---|---|
| C | Carbon 0.06 – 0.12 |
| Mn | Manganese 0.10 max |
| Si | Silicon 0.20 max |
| Cr | Chromium 18.00 – 20.00 |
| Mo | Molybdenum 9.00 – 10.50 |
| Co | Cobalt 10.00 – 12.00 max |
| Fe | Iron 5.00 max |
| Al | Aluminium 1.40 – 1.60 |
| Ti | Titanium 3.00 – 3.30 |
| B | Boron 0.003 – 0.010 |
| Ni | Nickel balance |
General Characteristics of Alloy Rene 41
René 41 is a precipitation-hardening, nickel-base high-temperature alloy, that displays high strength in the 1200/1800°F (650/980°C) temperature range. The alloy is designed for use in highly-stressed high-temperature applications.
Applications
The alloy may be used for afterburner parts, turbine casings, wheels, buckets, bolts and fasteners. It has very good resistance to jet engine combustion gases to 1800ºF (980ºC).
Forging
The recommended start forging temperature for this alloy is 2100ºF (1150
ºC.) Forging may be continued down to 1850/1900ºF (1010/1040ºC).
Heat treatment
Solution treatment is carried out at 1975ºF (1080ºC), for 1 hour and air cool, for best stress-rupture properties.
Precipitation hardening is carried out at 1400ºF (760ºC) and holding for 16 hours followed by air cool.
Annealing to obtain minimum hardness is performed at 1950ºF (1065ºC) followed by rapid quenching. Heavier sections may not react sufficiently to quenching to give maximum softness.
Machinability
The alloy is difficult to machine. Tungsten carbide tooling is recommended as are positive feeds and low speeds.
Best surface finishes are obtained if machining follows solution treatment or partial aging.
Weldability
The alloy may be welded by inert-gas-arc methods, and parts should be in the solution- treated condition, 1950/1975°F (1065/1080°C) for 4 hours, and preferably water quenched.
The alloy should be re-solution treated, preferably at 1900/1925°F (1040/1050°C), after welding. In addition, an aging treatment of 1650°F (900°C) for 1 hour, air cool, can be employed prior to the final 1400° (760°C) precipitation-hardening treatment to minimize the potential for cracking.
