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Metal dusting of nickel‐base alloys
Author(s) -
Grabke H. J.,
Krajak R.,
MüllerLorenz E. M.,
Strauß S.
Publication year - 1996
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19960470904
Subject(s) - materials science , chromium , nickel , carbide , metallurgy , graphite , alloy , metal , carbon fibers , base metal , oxide , composite material , composite number , welding
Metal dusting, the disintegration of metallic materials into fine metal particles and graphite was studied on nickel, FeNi alloys and commercial Ni‐base alloys in COH 2 H 2 O mixtures at temperatures between 450–750°C. At carbon activities a c > 1 all metals can be destroyed into which carbon ingress is possible, high nickel alloys directly by graphite growth into and in the material, steels via the intermediate formation of instable carbide M 3 C. Protection is possible only by preventing carbon ingress. Chromium oxide formation is the best way of protection which is favoured by a high chromium concentration of the alloy and by a surface treatment which generates fast diffusion paths for the supply of chromium to the surface. The metal dusting behaviour of Alloy 600 is described in detail. A ranking of the metal dusting resistance of different commercial nickel‐base alloys was obtained by exposures at 650°C and 750°C.