Peritectic reaction
Peritectic rebound reaction: During cooling of weld pool liquid, a solid phase forms that adapts through pressure and temperature.
Physicochemical Mechanism of Action
In the peritectic rebound reaction, the liquid weld phase reacts under cooling with the surrounding solid phases. A new, uniform solid phase forms, which adapts through pressure and temperature.
Metallurgical Relevance & Welding Risks
An insufficient peritectic rebound reaction can lead to pore formation and loss of mechanical properties. Too high cooling rates prevent the full approach to phase equilibrium, which poses risks for strength and toughness.
Workshop Practice & Instructions
To ensure an effective peritectic rebound reaction, it is important to control the cooling rate. This can be done through the choice of the right welding process and correct cooling techniques. For steel grades with high carbon content, slow cooling (e.g. in a furnace) should be applied to stabilize the structure.