What the AMS 2759 family is for steels (our article), these standards are for aluminum and superalloys. They are among the heat treatment standards that aerospace part manufacturers see most often in customer specifications.
AMS 2770: wrought aluminum parts
Covers the heat treatment of parts made from wrought aluminum alloys such as sheet, bar and forgings. The basic steps:
- Solution heat treatment: Dissolving the alloying elements in the metal.
- Quenching: Rapid cooling. The transfer time from furnace to quenchant is a critical requirement.
- Aging: Natural (at room temperature) or artificial (in a furnace). This step determines temper designations such as T4, T6 and T73.
Related reading: What is a TUS? · What is a SAT? · AMS2759 explained
AMS 2771: aluminum castings
For the heat treatment of sand, permanent mold and investment cast aluminum parts. Casting alloys and their temper designations differ from wrought alloys; the same table is not used.
AMS 2774: nickel and cobalt alloys
Covers the solution, aging and stress relief treatments of wrought nickel- and cobalt-based superalloy parts such as Inconel and Waspaloy. It is common on engine parts, and the requirements vary widely by alloy.
Which of these is in your records?
Knowing these is easy; the real question is which one is missing from your own records. These gaps slip past when records are read by eye, and auditors look for them first. Upload your furnace record and test results to NTB SpecPro and quickly see which points may carry risk, the likely reason and a suggestion.
The NTB SpecPro heat treat module compares your furnace record and test results for aluminum and nickel alloys with the relevant AMS standard and prepares the report. Final evaluation stays with the authorized heat treatment personnel.
Prepared by NTB SpecPro process quality engineering; reviewed by an engineer holding the International Welding Engineer (IWE) qualification. Questions: info@ntbspecpro.com
More articles