Abstract
Cobalt-based alloys are used as wear resistant, magnetic, and high strength materials. Alloying with nickel, chromium, Ta, W, Nb and Mo develop some extremely important properties such as fatigue and creep strength at high temperatures, and resistance to sulfidation. 20%–30% Cr additions provide oxidation and hot corrosion resistance. In cobalt alloys hardening occurs by precipitation of carbide during heat treatment. A new class of γ–γ′ cobalt-based superalloy has been reported and the optimum composition of the quaternary alloy is Co–10Al–5Mo–2 Nb. It has superior mechanical properties at high temperatures than the existing polycrystalline Co-based and Ni-based superalloys. Most of the commercial cobalt alloys are known with trademarks. The Stellite trademark, which was applied to the first cobalt wear alloys, is still in use. The Unified Numbering System has been used to designate a number of commercial cobalt alloys.
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