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Information About the Cobalt Chrome Alloy
08:37 on 27.12.2018
Cobalt metal is mainly used to make alloys. Cobalt Alloy is the general name of one or more alloys made of cobalt and chromium, tungsten, iron and nickel. A tool containing cobalt can significantly improve the performance of wear resistance and cutting of steel. As an important material for cutting tools containing gold and aluminum, stellite alloys containing more than 50% cobalt won’t lose their original hardness even if heated to 1000℃. Cobalt combines the carbide grains of other metals in the alloy composition to make the alloy more ductile and less sensitive to impact. This alloy is welded on the surface of parts, which can increase the life of parts by 3-7 times.

Under heating, the temperature at which magnetism is lost is called the Curie point. The Curie point of iron is 769℃, the nickel is 358℃, and the cobalt is up to 1150℃. Magnetic steel containing 60% cobalt is 2.5 times stronger than ordinary magnetic steel. Under vibration, generally magnetic steel loses about 1/3 of its magnetic properties, while cobalt steel loses only 2%-3.5%. Obviously, cobalt has an advantage in magnetic materials. In addition, cobalt is widely used in electroplating, glass, dying, medical and medical applications. Besides, cobalt may also be used to make nuclear weapons, a theoretical atomic bomb or hydrogen bomb, which is installed in a cobalt shell. It can turn cobalt into deadly radioactive dust after the explosion.

Wrought Cobalt Chrome Alloy is mainly strengthened by solid solution and carbide. The main types of carbides are MC, M6C, M23C6, M7C3, etc. The bulk MC carbide strengthening effect is not obvious. Carbides (M23C6) located at grain boundaries can prevent grain boundary migration and thus contribute to durable strength. It is shown that the endurance strength of cobalt-based deformation superalloy is lower than that of nickel-based deformation superalloy in the range of low and medium temperature, but it shows higher durability at temperatures above 980℃.

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