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Posted: 11/20/2018 - 0 comment(s) [ Comment ] - 0 trackback(s) [ Trackback ]
Category: cobalt alloy
Cobalt Alloy, commonly known as stellite alloy, is an alloy composed of alloy elements such as Cr, W, C, etc., with a carbon content of 0.7% to 3.0% and a chromium content of 25%. 33%, tungsten content 3% to 25%, cobalt content 30% to 70%.

The role of cobalt is to make the alloy have high corrosion resistance and obtain a solid solution matrix with good toughness. A large amount of chromium makes the alloy have high oxidation resistance, and tungsten can increase the high temperature strength of the alloy to improve the high temperature creep resistance. The higher carbon content can form high hardness chromium carbide and tungsten carbide, which makes the stellite alloy have good wear resistance.

The metallurgical structure of the Cobalt Alloy Plate depends on the carbon content and the content of other alloying elements. When the carbon content is low, the microstructure contains a large amount of primary austenite dendrites, the austenite dendrites are solid solutions of chromium and tungsten in cobalt, and the matrix structure is a co-crystal of solid solution and chromium-tungsten composite carbide. As the carbon content increases, the amount of austenite decreases and the number of eutectics increases, manifesting as a hypoeutectic structure.

When the carbon content is high, the microstructure has hypereutectic characteristics, and the nascent coarse chromium-tungsten composite carbide is distributed on the solid solution and the carbide eutectic substrate. By adjusting the carbon content and the tungsten content in the alloy, a weld overlay alloy having different hardness and toughness can be obtained. The overall performance of stellite alloy is superior to other types of surfacing metals.

Stellite Alloy has high thermosetting properties and can maintain hardness of 350-500 HV at 500-700 °C, anti-abrasive wear, corrosion resistance, impact resistance, thermal fatigue resistance, high temperature oxidation resistance (1000 ° C) and resistance Excellent friction and wear resistance between metals.