초록

The presence of yttrium and/or related rare earth elements in amounts ranging from a positive amount to up to but not including 0.1% by weight in alloys described in U.S. Pat. No. 4,086,085 issued Apr. 25, 1979 significantly improves the hot workability and resistance to grain growth of said alloys.

대표청구항 ▼

In a workable, high temperature austenitic nickel, chromium, aluminum iron-base alloy in which the nickel, chromium and aluminum contents are balanced to insure that the alloy is austenitic and is an alloy which forms an aluminum oxide film which is protective of the base metal to 1700°F. in air, sa

In a workable, high temperature austenitic nickel, chromium, aluminum iron-base alloy in which the nickel, chromium and aluminum contents are balanced to insure that the alloy is austenitic and is an alloy which forms an aluminum oxide film which is protective of the base metal to 1700°F. in air, said alloy consisting essentially of 18.0 to 35.0 weight percent of nickel, 10.0 to 20.0 weight percent of chromium, 4.0 to 5.0 weight percent aluminum, and the balance consisting essentially of iron, and the improvement in said alloy which consists in including in said alloy from 0.04 to 0.06 weight percent of yttrium to obtain improved hot workability and resistance to grain growth, as compared with an otherwise similar alloy which is free from yttrium, said alloy being austenitic by virtue of the balancing of said alloying constituents and containing no delta ferrite.