Order-disorder transformation
Order-disorder transformation is a phase transition in which atomic species in solid alloys change positions and strongly alter electrical and mechanical properties.
Physical-Chemical Mechanism of Action
During the order-disorder transformation, the atomic arrangements in solid alloys change. At lower temperatures, certain atoms take up exact lattice positions, leading to a statistical distribution and strongly altering the material structure.
Metallurgical Relevance & Welding Risks
This transformation can lead to increased stress buildup and cracking if not properly controlled. Incorrect temperature conditions during cooling can result in uneven material structure, leading to loss of toughness or hot cracking.
Workshop Practice & Action Guidelines
To control the order-disorder transformation, it is important to precisely regulate the cooling steps. The critical temperature zone should be maintained to ensure a homogeneous material structure. For steels with high carbon content (e.g., martensitic), cooling times and temperatures must be precisely controlled to avoid cracking and stress buildup.