Abstract
The as-quenched Fe–8.68wt.% Al–30.5wt.% Mn–1.85wt.% C alloy is plasma-nitrided at 500°C for 8h. The nitrided layer obtained is 40μm thick and composed predominantly of AlN, with a small amount of Fe4N. The resultant surface hardness (1860Hv), substrate hardness (550Hv), ductility (33.6%) and corrosion resistance in 3.5% NaCl solution in the present nitrided alloy are far superior to those obtained previously in optimally nitrided high-strength alloy steels, as well as martensitic and precipitation-hardening stainless steels.
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