Cobalt Chrome Alloy have a high strength at low tempera […]
Cobalt Chrome Alloy have 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.
The most important carbides in the cobalt-base superalloy are MC, M23C6 and M6C are in cobalt saw tips, and M23C6 precipitates between grain boundaries and dendrites during slow cooling. 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 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 Cobalt Chromium Alloy, 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.
The general cobalt-base superalloy lacks a coherent reinforcing phase. Although the mid-temperature strength is low (only 50-75% of the nickel-based alloy), it has higher strength at temperatures above 980 ° C, good thermal fatigue resistance, hot corrosion resistance And abrasion resistance, and has good weldability. Suitable for making aviation jet engines, industrial gas turbines, guide vanes and nozzle guide vanes for marine gas turbines, and diesel engine nozzles.