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Knowledge sharing on CoCrMo cobalt chromium molybdenum alloy rods

Knowledge sharing on CoCrMo cobalt chromium molybdenum alloy rods

2020-09-28

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Classification and applications of wear-resistant and corrosion-resistant cobalt-chromium-molybdenum alloys

Classification and applications of wear-resistant and corrosion-resistant cobalt-chromium-molybdenum alloys

2020-09-28

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The application of biomedical titanium materials in the human body

The application of biomedical titanium materials in the human body

2020-09-27

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Determination of residual stress in titanium standard parts casting

Determination of residual stress in titanium standard parts casting

2020-09-27

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How to deal with the reaction layer of surface defects on titanium plates and titanium rods

How to deal with the reaction layer of surface defects on titanium plates and titanium rods

2020-09-25

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Manufacturer introduces the uses of cobalt chromium molybdenum alloy

Manufacturer introduces the uses of cobalt chromium molybdenum alloy

CoNiCrMo alloy is one of the promising forged cobalt-based alloys, originally known as MP35N. When subjected to stress, it can have high corrosion resistance in seawater (containing chloride ions). Cold working can increase the strength of this alloy, but cold working is quite difficult, especially for manufacturing large devices such as hip stems, where only hot forging is more suitable. The wear resistance of forged CoNiCrMo alloy is similar to that of cast CoCrMo alloy, and it has the advantages of good fatigue resistance and high tensile strength. Therefore, it is suitable for applications that require a long lifespan and are free from fractures or stress fatigue, such as artificial joints in the hip. This advantage is important for the difficult and expensive surgery of deeply implanting the device into the femoral medullary canal. The elastic modulus of cobalt-based alloys does not change with the maximum tensile strength, and its value ranges from 220 to 234 GPa, which is higher than other materials such as stainless steel. CoCrMo alloy is particularly susceptible to work hardening, so it cannot be manufactured using the same processes as other metals; instead, vacuum precision casting must be used. Controlling the mold temperature can control the grain size of the casting; higher temperatures form coarser grains, which reduces strength but also precipitates larger, more spaced-out carbides, thereby reducing the material's brittleness. Currently, the main domestic units producing, researching, and promoting cobalt-chromium-molybdenum alloys include the Central Iron & Steel Research Institute and Beijing Rongdian Metal Co., Ltd.

2020-09-24

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