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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.

decreasing the amount of undercooling creates finer grain size or create larger grain size?

decreasing the amount of undercooling create finer grain size ??? !!!!!

thank arunmrao[love2]

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.

to fine-grain we need to increase undercooling or need to decrease undercooling ?

What's the relationship between cooling rate of melt and undercooling ( Supercooling ) ?? does undercooling ( Supercooling ) increase when cooling rate of melt increases ?? If there 's no general rule in this subject, What's the relationship between cooling rate of melt and undercooling...

could someone explain how "post weld heat treatment (PWHT)" is done ? and if someone has clip(s) or picture(s) about this topic please Introduce me…tank you