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Originally Posted by SaabJohan
Water has been used to cool steel since the times the smiths make swords and cooled them in water to make them harder. You can simply take out a piece of metal from a 800 degree C oven and cool them in cold water, I have done this myself and the temperature of the metal drops at once without cracking. It will affect the structure and how the metal is composed but it will not make it crack.
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again I agree with what you said i know how fast cooling can actually improve the strenght of the steel(it has been used to forge swords for centuries)
but look at my earlier post again i mentioned a turbo is made out of several parts put togheter...from different aloys with different expansion and contraction rates....this will cause the metals to push against each other and potentially crack