Cellular Crystallization Front
The cellular crystallization front forms due to constitutional undercooling and local impurity segregation at the solidification front. It shapes the initial solidification structure.
Physical-Chemical Mechanism of Action
The cellular solidification front forms when the melt cools quickly and unevenly. Local impurities are swept out and constitutional components undercool. This creates a polygonal structure at the solidification front.
Metallurgical Relevance & Welding Risks
The cellular solidification front can cause uneven strength and toughness in the structure. It increases susceptibility to cracking and hot cracking, especially when caused by too-fast cooling.
Workshop Practice & Action Guidelines
To achieve a homogeneous solidification front, ensure controlled cooling steps and even cooling of the weld. Use cooling media or cooling plates as needed to regulate the cooling rate.