Annealing carburization
Annealing carburization is an undesirable carburization of the surface layer due to interactions with the furnace atmosphere. It impairs the mechanical surface properties and can lead to damage such as cracks or deformation.
Physical-Chemical Mechanism of Action
Carburization during annealing occurs when carbon from the furnace atmosphere diffuses into the surface layer of the metal. This process can be intensified by high temperatures and slow cooling.
Metallurgical Relevance & Welding Risks
Carburization leads to surface hardening, which impairs mechanical properties such as hardness and toughness. This can cause cracks, deformation, or even component failure. Moreover, it can make welding more difficult and reduce weld life.
Workshop Practice & Action Guidelines
To prevent carburization, the following measures should be taken:
• Use a correct furnace atmosphere with low carbon content.
• Ensure that cooling after welding is fast and controlled.
• Keep the furnace temperature as low as possible to minimize carburization.