The present invention relates to a
nickel-base Gamma / Gamma'
superalloy with a unique blend of at most moderate cost, high
oxidation resistance, high hot
corrosion resistance, moderate strengthening, adequate
alloy stability, and comparatively good
weldability. The said
alloy comprises: Up to 20 wt% of the sum of Co and Fe, between 17 and 21 wt% Cr, between 0.5 and 3 wt% of the sum of Mo and W, at most 2 wt% Mo, between 4.8 and 6 wt% Al, between 1.5 and 5 wt% Ta, between 0.01 and 0.2 wt% of the sum of C and B, between 0.01 and 0.2 wt% Zr, between 0.05 and 1.5 wt% Hf, between 0.05 and 1.0 wt% Si, and between 0.01 and 0.5 wt% of the sum of rare earths such as Sc, Y, the actinides and the lanthanides, such that at least two of these rare earths are present in the
alloy, and no more than 0.3 wt% of any of these rare earths. It further relates to its use in hot components such as, but not restricted to, blades, vanes, heat shields, sealings and
combustor parts in
gas turbines. It further relates to its use as filler alloy for repair
welding and / or cladding of such hot components. It further relates to its use as protective
coating and / or
bond coat in a TBC
system on such hot components. It further relates to its dual use as
coating and / or
bond coat, and, for repair and / or cladding on such hot components. It further relates to its use as intermediate layer between the base alloy and another
coating and / or
bond coat on such hot components. It further relates to its use in polycrystalline, directionally solidified or
single crystal form in such components. It further relates to its production by processes such as, but not restricted to,
precision casting,
laser welding / cladding,
hot box welding,
laser sintering, cold spraying,
explosion welding and vacuum
plasma spraying. It further relates to its production by low S
processing. It further relates to its use as part of material systems as exemplified above produced by low S
processing.