Cobalt matrix alloying influence
Cobalt-matrix alloys stabilize the austenite phase at high temperatures, increasing hot wear resistance and hot strength. They prevent phase transformations and improve behavior under mechanical load.
Physical-Chemical Mechanism
Cobalt-matrix alloys contain cobalt, which stabilizes the austenite phase. This prevents phase transformations such as into martensite or ferrite that could occur at high temperatures. Cobalt increases strength and hot wear resistance through an improved crystal structure.
Metallurgical Relevance & Welding Risks
If cobalt-matrix alloy is missing or insufficient, phase transformations can lead to hot cracking and loss of hot strength. This can impair mechanical behavior at high temperatures and reduce component service life.
Workshop Practice & Instructions
To exploit the benefits of cobalt-matrix alloys, it is important to ensure that the weld is kept in the correct temperature range. This means controlled cooling and avoiding too rapid cooling to prevent phase transformations. When selecting the welding process, ensure that it respects the specific properties of the cobalt alloy.