Recalescence
Recalescence is a brief temperature rise in an undercooled melt or solid due to the release of latent transformation heat. This can lead to unwanted phenomena like distortion or stress buildup.
Physicochemical Mechanism of Action
Recalescence occurs when a melt or solid material is undercooled and releases latent transformation heat. This energy causes a sudden temperature rise in the material.
Metallurgical Relevance & Welding Risks
During welding, recalescence can cause unwanted distortion or stress that impairs the microstructure and can lead to cracks. It also increases susceptibility to hot cracking and alters the mechanical properties of the weld.
Workshop Practice & Action Guidelines
To minimize recalescence, cool the material slowly. For steels, a controlled cooling process (e.g., in a furnace) is recommended. Avoid rapid cooling steps, especially for high-carbon steels or weldments under high stress.