Multiple solidification modes can occur in metals. These modes describe the
different morphological forms that can exist at the S–L interface and in many
cases are still apparent when cooled to room temperature.
• Under conditions of low solidification rates, steep temperature gradients, or
both, plane front solidification can occur.
• In most practical cases, the plane front breaks down into other modes
described by either cellular or dendritic morphologies.
In addition to Alanbagi response, solidification mode is dependent on Alloy contents which influence the elemental partition coefficient and eventual non-equilibrium solidification
The most stable solidification mode is dictated by the combined effect of composition content, temperature gradient, and solidification range.
Abdulaziz Albannai Lawrence O. Osoba
thank you for your comment
my concern is, which one is the most stable, Planar, Cellular, Cellular dendritic, Epitaxial, Equiaxial, or Columnar dendritic? and Why?
Cooling rates in fusion welding methods vary. Things change when you change the welding method. Also, grain refiners play a significant role if they exist in the material. You need to specify the material composition as well.
Tayfun Soysal
thank you for your comment
my concern is, which one is the most stable, Planar, Cellular, Cellular dendritic, Epitaxial, Equiaxial, or Columnar dendritic? and Why?
Let me give you an example. Let's say you do arc welding of a material without grain refiners in it. Then, typical solidification mode can be cellular or columnar dentritic.
Tayfun Soysal
I agreed with you
A planar solidification front first breaks down into a cellular front and then
into more complex dendritic morphologies, depending on solidification
conditions.
Most alloys solidify in either cellular, cellular dendritic, columnar dendritic
modes, or a combination of these. The solidification mode is determined by
the degree of constitutional supercooling , or undercooling, that exists in the
liquid immediately in front of the S–L interface. As the extent of supercooling
increases, more dendritic modes of solidification are favored.
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