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Posted: 1/10/2018 - 0 comment(s) [ Comment ] - 0 trackback(s) [ Trackback ]
Category: Technology

Cobalt-Chromium Alloy is a carbide that is resistant to all types of wear and corrosion and high temperature oxidation. The so-called cobalt-based alloy. The original Stellite alloy is a cobalt-chromium binary alloy, later developed into cobalt chromium tungsten ternary composition. Cobalt chrome tungsten alloy is based on cobalt as a main component, containing a considerable amount of chromium, tungsten and a small amount of nickel, molybdenum, silicon, carbon, niobium, tantalum and other alloying elements, and occasionally also contain a class of iron alloy. Depending on the composition of the alloy, they can be made into wire, powder for hard surfacing, thermal spraying, spray welding and other processes, can also be made into castings and forgings and powder metallurgy.
Carbide-strengthening phase Cobalt-chromium tungsten alloy is the most important carbide MC ﹑ M23C6 and M6C, in the casting of cobalt-chromium-tungsten alloy, M23C6 is slow cooling precipitation in the grain boundaries and dendrites. 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 strengthened microstructure of cobalt-chromium-tungsten superalloy HA-31 (X-40) 6 C type carbide, 
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