MULTI NANO-PRECIPITATE STRENGTHENED AUSTENITIC STEEL

摘要

Disclosed is an alloy having 7-30 wt. % manganese, 1-15 wt. % nickel, 1-10 wt. % aluminum, 1-8 wt. % copper, 0-15 wt. % chromium, 0-5 wt. % molybdenum, 0-3 wt. % vanadium, 0-3 wt. % titanium, 0-3 wt. % niobium, 0-2 wt. % silicon, 0-1 wt. % carbon, and balance of iron. A majority of the iron is γ-Fe. The alloy has β-NiAl precipitates and Cu-rich precipitates. At least 95 vol. % of the β-NiAl precipitates have a maximum dimension of 500 nm or less. The Cu-rich precipitates are at least 40 at. % copper. The alloy can be made by thermal processing steps without mechanical processing steps.