Cobalt-Chromium Alloy for marine gas turbines

  • Cobalt-Chromium Alloy has a high strength at low temperature (only 50-75% of that of a nickel-based alloy) at temperatures higher than 980 ° C, good thermal fatigue resistance, hot corrosion resistance and abrasion resistance, and has Better weldability. Suitable for making aviation jet engines, industrial gas turbines, guide vanes and nozzle guide vanes for marine gas turbines, and diesel engine nozzles.

    Carbide-enhanced phase of the cobalt-based superalloy is the most important carbide MC, M23C6 and M6C Castor Cobalt Alloy, M23C6 slow cooling in the grain boundary and dendrite precipitation. In some alloys, the fine M23C6 can form a co-crystal with the matrix γ. MC carbide particles are too large, can not have a direct impact on the dislocation, so the strengthening effect of the alloy is not obvious, while fine dispersed carbide has a good strengthening effect.
    The carbides (mainly M23C6) located on the grain boundaries can prevent the grain boundary from sliding and thus improve the long-term strength. The strengthening phase of the cobalt-based superalloy HA-31 (X-40) with dispersed microstructure is (CoCrW) 6 C-type carbide.
    The wear of gold workpieces is largely influenced by the contact or impact stresses on their surface. The surface wear under stress is dependent on the dislocation flow and the interaction of the contact surfaces. For Stellite, this feature is associated with a lower layer stacking error of the matrix and a shift from face-centered cubic to hexagonal close-packed crystal structure under the influence of stress or temperature.
    With hexagonal close-packed crystal structure of metal materials, wear resistance is better. In addition, the second phase of the alloy, such as carbide content, morphology and distribution also have an impact on the wear resistance. Due to chromium, tungsten and molybdenum alloy carbide distribution in the cobalt-rich matrix and some chromium, tungsten and molybdenum atoms solid solution in the matrix, so that the alloy is strengthened, thereby improving the wear resistance.
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