Graphitization Decomposition
Graphitization decomposition is the process where metastable cementite transforms into stable graphite and ferrite. This happens through slow thermal exposure.
Physicochemical Mechanism of Action
Graphitization decomposition occurs when metastable cementite transforms into a stable state of graphite and ferrite. This process requires slow thermal exposure and is a chemical-physical transformation process.
Metallurgical Relevance & Risks in Welding
Graphitization decomposition can lead to a change in the mechanical properties of the steel. The material becomes softer and less tough, which impairs strength. This can be problematic, especially for highly stressed components.
Workshop Practice & Instructions
To avoid graphitization decomposition, it is important to carry out the welding procedure in such a way that the maximum temperature and heat duration are limited. For steels with high cementite content, controlled cooling should be performed to avoid metastable phases.