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relationship between undercooling and grain size in solidification of metal???

relationship between undercooling and grain size in solidification of metal???

relationship between undercooling and grain size in solidification of metal???

(OP)
to fine-grain we need to increase undercooling or need to decrease undercooling ?

RE: relationship between undercooling and grain size in solidification of metal???

ok, I'll bite, what university are you at, and why didn't you take notes in your solidification class....

Nick

RE: relationship between undercooling and grain size in solidification of metal???

(OP)
NickE
excuse me. i am persian. i can speak english hardly.

I hardly understand some your talks. sorry

and i did not understood your Purpose in recent Comment.

RE: relationship between undercooling and grain size in solidification of metal???

I apologize, ignore my last post; you appeared as if you were still a student at a university and not employed professionally in engineering.

In answer to your question: finer grain sizes are created by a more homogeneous neucleation, this would be accomplished by using a neucleant (foundry magic dust), normally (IIRC) decreasing the amount of undercooling in the mold. High solidification rates, and high heat extraction rate, along with a large number of nuecleation sites produce a finer structure.


Nick

RE: relationship between undercooling and grain size in solidification of metal???

(OP)
decreasing the amount of undercooling create finer grain size ??? !!!!!

RE: relationship between undercooling and grain size in solidification of metal???

creating a finer grain size will cause there to be less undercooling in the mold.

I don't think of undercooling as a parameter I can directly control, it is more of a response. As-Cast Grain Size however is controlled by mold design, pouring temp, inoculant, alloy, shake out time, and probably something else I've forgotten.



It has been a long time since I have done this work, so you'll forgive me, I may be wrong.

Nick

RE: relationship between undercooling and grain size in solidification of metal???

(OP)
i think increasing the amount of undercooling creates finer grain size.
how increasing the amount of undercooling ?
increasing the amount of undercooling with increase cooling rate of melt.

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