New Alloys for Automotive Turbines

THIS paper reports on progress to date in the development of high-temperature alloys for automotive gas turbines.

Strict limitations have been set on the alloying elements in order to keep costs down — the cost factor being the main reason for this alloy search.

The materials discussed here, which meet the alloy limitations and the temperature and stress requirements, fall into three classes:

1. 1.
   Iron-base chromium - manganese - nitrogen austenitic alloys.
2. 2.
   Iron-aluminum ferritic alloys.
3. 3.
   Cast ferritic alloys with up to 12% chromium and some titanium, vanadium, molybdenum, and tungsten.