During solidification, solidification structure can be changed by temperature gradient and velocity of liquidus isotherm at solid/liquid interface.
I have an idea about its morphological change by relationship between temperature gradient and velocity of liquidus isotherm.
However, I want to know that which factors can make slower or faster the velocity of liquidus isotherm (so called as solidification rate or growth rate) during solidification ?
Please let me know if someone have an idea for that.
Thanks a lot.
Hello
By controlling the velocity of truth, it is possible to form desired phase and structural changes in the metals. You can cool at high speed then the material will remain phases characteristic of high temperatures. Heat treatments can then be performed to reduce internal peaks and to form the structure.
At low speeds of realism (throwing in a furnace) then a uniform structure is guaranteed. If it is carried out in vacuum to ensure non-oxidized thermal treatment.
Wishing for success in scientific and research work.
With respect
Emil Yankov
many aspects can use in solidifaction study, for example, chemical compsition, delta T (subcooling) , impures nonmetallic inclusion etc
Dear Dongsoo Kang,
Maybe I did not fully understand your question, but I will try to answer. The solidification microstructure is usually studied by means of a Bridgman furnace, and in this case the solidification rate is a parameter controlled by the experimental setup. Your question suggests that you are not in this case.
If you are pouring your liquid alloy in a cold crucible, then the solidification rate is a complex consequence of the thermal interaction between the cold crucible and your liquid alloy. But, we can guess that the solidification rate should be higher if :
- your crucible is colder (water-cooled for example)
- the size of the ingot is smaller
However, if you reach a higher solidification rate this way, you will also reach higher thermal gradients, and you will not know whether the ratio (thermal gradient over solidification rate, which is also relevant to look at regarding solidification microstructures) is higher or smaller.
Best regards
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