Peritectic reaction kinetics
Peritectic reactions are processes where a liquid phase reacts with a solid phase to form a new solid phase and release heat. This is typical for metal forming under heat.
Physical-Chemical Mechanism of Action
In peritectic reactions, atoms from the liquid phase react with atoms of the solid phase to form a new solid phase. This process moves toward phase equilibrium and removes heat.
Metallurgical Relevance & Risks in Welding
Peritectic reactions can cause deformation and stresses during cooling of weld areas, which can lead to cracks or fractures. It is important to ensure the correct cooling position and rate to avoid these phenomena.
Workshop Practice & Instructions
To control peritectic reactions, the cooling of weld areas should be slow and uniform. This can be achieved by using cooling water or cooling gas. The cooling rate should be set so that the critical temperature window is not exceeded.