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Cryo Treatment
Joe, I think you are correct. The folks at 300Below let the vapor from the LN do the chilling and never actually immerse the part into the liquid. The more gentle cooling and heating are said to minimize distortion. Remember that since the part is now below the Martensite Start temperature, the speed at which it is cooled is no longer critical. Only the temperature to which it is cooled affects the amount of martensite formed.
Now I have a question: has anyone ever heard of a maker using multiple austenitizing, quenching and cryo treatments? Multiple normalizing and multiple hardening treatments are common but I wonder if there is anything to be gained from cryo treating after each heating and quenching cycle. :confused:
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Which is worse; ignorance or apathy? Who knows? Who cares?
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