Cobalt-based alloy powder has the following characteristics (marketing department of Shanghai HY Industry Co., Ltd)
The wear of alloy workpieces is largely influenced by the contact or impact stresses on their surfaces. Surface wear under stress depends on the dislocation flow and the interaction characteristics of the contact surfaces. In the case of cobalt-based alloys, this characteristic is related to the lower dislocation energy of the matrix and the transformation of the matrix organization from face-centered cubic to hexagonal dense crystal structure under the influence of stress or temperature, and the wear resistance of metallic materials with hexagonal dense crystal structure is superior. Cobalt-based alloy powder can be used in many industrial applications.
In addition, the content, morphology and distribution of the second phase of the alloy, such as carbide, also have an effect on the wear resistance. The alloy is strengthened due to the distribution of chromium, tungsten and molybdenum carbides in the cobalt-rich matrix and the solid solution of some chromium, tungsten and molybdenum atoms in the matrix, resulting in improved wear resistance. In cast cobalt-based alloys, the carbide particle size is related to the cooling rate, and faster cooling results in finer carbide particles. Cobalt-based alloy powder is also very popular.
In sand casting, the hardness of the alloy is lower and the carbide particles are coarser. In this state, the abrasive wear resistance of the alloy is significantly better than that of graphite casting (finer carbide particles), while there is no significant difference between the two in terms of adhesive wear resistance, indicating that coarser carbides are beneficial to improving the resistance to abrasive wear.
The size and distribution of carbide particles and grain size in cobalt-based alloys are sensitive to the casting process. In order to achieve the required lasting strength and thermal fatigue properties of the cast cobalt-based alloy parts, the casting process parameters must be controlled. Cobalt-based alloys need to be heat treated, mainly to control the precipitation of carbide. For cast cobalt-based alloy, firstly, high-temperature solution treatment is carried out, usually at a temperature of about 1150℃, so that all primary carbides, including some MC-type carbides, are dissolved into the solid solution; then aging treatment is carried out at 870-980℃ to make the carbides precipitate again.
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