Overview of 3D metal printing CoCrMo powder
3D metal printing CoCrMo powder is one of the cobalt-based alloys, and it is also a kind of the so-called Stellite alloy. It is a cobalt-based alloy that is resistant to wear and corrosion. The first cobalt-based alloy was a binary cobalt-chromium alloy, which was later developed into a ternary composition of cobalt-chromium-tungsten, and only later did cobalt-chromium-molybdenum alloys. Cobalt-chromium-molybdenum alloy is a kind of alloy with cobalt as the main component, containing a considerable amount of chromium, molybdenum, and a small amount of alloying elements such as nickel and carbon, and occasionally also containing iron. According to the different components in the alloy, they can be made into welding wire, powder used for hard surface welding, thermal spraying, spray welding, and other processes, and can also be made into castings and forgings and powder metallurgy parts.
Cobalt and chromium are the two basic elements of cobalt-based alloys, and the addition of molybdenum can obtain finer grains and have higher strength after casting or forging.

Classification of3D metal printing CoCrMo powder
Cobalt-chromium-molybdenum alloys are basically divided into two categories: CoCrMo alloy and CoNiCrMo alloy;
The first category is CoCrMo alloy, which is usually a cast product; the improvement of the process in recent years has greatly improved the comprehensive mechanical properties of this material.
The other type is CoNiCrMo alloy, which is usually (hot) forged and precision processed. Casting CoCrMo alloy has been used in dentistry for decades and is currently used to make artificial joints. Forged CoNiCrMo alloy is used to make joints with heavy loads such as knee joints and hip joints.
 
Application of 3D metal printing CoCrMo powder
CoNiCrMo alloy is one of the potential forging cobalt-based alloys. It was originally called MP35N. When under stress, it can have high corrosion resistance in seawater. Cold working can increase the strength of the alloy. However, cold working is quite difficult, especially For manufacturing large devices, such as hip joint handles, only hot forging is more suitable.
The wear resistance of forged CoNiCrMo alloy is similar to that of cast CoCrMo alloy. It has the advantages of good fatigue resistance and high tensile strength. Therefore, it is suitable for applications that require a long life without fracture or stress fatigue, such as hip joints. Artificial joints, this advantage is very important for the difficult and expensive operation of burying the implant deep into the femoral bone marrow duct.
 
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