Abstract
The Ti and Ti-Al coatings were deposited onto hot-worked AISI H11 steel substrates and plasma nitrided at 900 °C. The Ti coated samples were successfully nitrided, while cracking and delamination of the Ti-Al coating was observed during nitriding. The formation of δ-TiN and ϵ-Ti 2N phases were detected after plasma nitriding of the Ti coating. During plasma treatment of the Ti-Al coating, the initial Ti 3Al and Al phases were partially transformed into TiAl phase. The martensite transformation of the substrate material was found. The as-deposited Ti coating has a fibrous structure, while the structure of the as-sputtered Ti-Al coating is columnar. The superficial Vickers microhardness of plasma-nitrided Ti coating was 2200 HV 0.03 and the critical load of higher than 50 N indicates very good coating-to-substrate adhesion.
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