The size and distribution of Cobalt-Chromium Alloy

in Top Real Estate Developers Mon Dec 25, 2017 12:17 pm
by cobaltalloy • 2 Posts

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Machining methods are far superior in machining accuracy to other machining methods, but because of their low material availability and the limited shape and finish of their tooling and equipment, some parts can not be machined. In contrast, MIM can effectively utilize materials with unlimited freedom of shape. For the manufacture of small, difficult-to-shape precision parts, the MIM process is less costly, more efficient and more competitive than machining. MIM technology makes up for the traditional processing methods in the technical deficiencies or can not make the shortcomings, not with the traditional processing methods of competition. MIM technology can play its specialty in the area of ​​parts that traditional machining methods can not produce.

The size and distribution of carbide particles in the Cobalt-Chromium Alloy cobaltalloy and the grain size are sensitive to the casting process and the casting process parameters have to be controlled in order to achieve the required long-term strength and thermal fatigue properties of the Stellite component. Cobalt-Chromium Alloy need to be heat treatment, mainly to control the precipitation of carbides. For Castor too alloy, the first high-temperature solution treatment, the temperature is usually about 1150 ℃, so that all the primary carbides, including some MC-type carbide dissolved in solid solution; and then at 870-980 ℃ aging treatment , Carbide (most commonly M23C6) re-precipitation. Cobalt-Chromium Alloy surfacing Secretary too legislation surfacing alloy containing chromium 25-33%, containing 3-21% tungsten, carbon 0.7-3.0%. , With the increase of carbon content, the microstructure changes from hypoeutectic austenite + M7C3 eutectic to hypereutectic M7C3 primary carbide + M7C3 eutectic. The more carbon, the more primary M7C3, macroscopically increased hardness, abrasive wear resistance increased, but the impact resistance, weldability, machining performance will decline. Stellite, alloyed with chromium and tungsten, has good oxidation, corrosion and heat resistance.

The wear of alloy workpieces is greatly influenced by the contact stresses or impact stresses on their surfaces. The surface wear under stress is dependent on the dislocation flow and the interaction of the contact surfaces. For Stellite, this feature is associated with a lower stacking fault energy of the matrix and the transformation of the matrix structure from face-centered cubic to hexagonal close-packed crystal structure under the influence of stress or temperature, with hexagonal close-packed crystal structure Metal materials, wear resistance is better. In addition, the second phase of the alloy, such as carbide content, morphology and distribution also have an impact on the wear resistance. Due to chromium, tungsten and molybdenum alloy carbide distribution in the cobalt-rich matrix and some chromium, tungsten and molybdenum atoms solid solution in the matrix, so that the alloy is strengthened, thereby improving the wear resistance.

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