Cobalt Based Alloy Properties

Cobalt Based Alloy is a hard alloy that can withstand various types of wear, corrosion and high temperature oxidation.
It is commonly referred to as cobalt-chromium-tungsten (molybdenum) alloy or Stellite alloy.
Cobalt Based Alloys are based on cobalt as the main component, containing a considerable amount of nickel, chromium, tungsten and a small amount of alloying elements such as molybdenum, niobium, tantalum, titanium, lanthanum, and occasionally 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 Based AlloyCobalt Based Alloy

Classification:
Classified by use, Cobalt Based Alloy can be divided into cobalt-based wear-resistant alloys, cobalt-based high-temperature alloys, and cobalt-based wear-resistant and aqueous solution corrosion alloys.
In general operating conditions, in fact, they are both wear-resistant, high-temperature resistant or wear-resistant and corrosion-resistant.
Some operating conditions may also require high-temperature, wear-resistant and corrosion-resistant at the same time, and the more complex the work is Under these circumstances, the more it can reflect the advantages of cobalt-based alloys.

Cobalt Based AlloyCobalt Based Alloy

Grade:

The typical grades of cobalt-based high temperature alloys are: Hayness188, Haynes25(L-605), Alloy S-816, UMCo-50, MP-159, FSX-414, X-40, Stellite6B, etc.
Chinese grades are: GH5188(GH188 ), GH159, GH605, K640, DZ40M and so on.
Different from other superalloys, cobalt-based superalloys are not strengthened by an ordered precipitation phase firmly bonded to the matrix, but are composed of an austenite fcc matrix that has been solid solution strengthened and a small amount of carbides distributed in the matrix.
Casting cobalt-based superalloys relies heavily on carbide strengthening. Cobalt based alloys have a flat fracture stress-temperature relationship, but they show better thermal corrosion resistance than other high temperatures above 1000°C.
This may be due to the higher chromium content of the alloy, which is the most important part of this type of alloy. A feature.

Cobalt Based Alloy Cobalt Based Alloy

Heat treatment:

The size and distribution of carbide particles and grain size in cobalt-based alloys are very sensitive to the casting process.
In order to achieve the required endurance strength and thermal fatigue properties of cast cobalt-based alloy parts, the casting process parameters must be controlled.
Cobalt-based alloys need heat treatment, mainly to control the precipitation of carbides. For cast cobalt-based alloys, first perform high-temperature solid solution treatment, usually at a temperature of about 1150°C, so that all primary carbides, including some MC-type carbides, are dissolved into the solid solution: then aging treatment is performed at 870-980°C. Make carbides precipitate again.

 

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