ABSTRACT
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In the course of special heat treatment of metallic components and during the fabrication of semi nished products, quenching from high to low temperatures is frequently applied. In such cases, quenchants must be brought into contact with the surfaces of the quenched materials, a llowing a su f ciently r apid h eat t ransfer. T he m ostly em ployed qu enching methods i nvolve ei ther i mmersion co oling, sp lash co oling, o r lm c ooling. I mmersion cooling, f or which a w orkpiece i s sub merged i n a n u nmoved o r agitated l iquid, i s, f or example, applied in the eld of martensitic hardening of steels and after annealing prior to the precipitation hardening of age-hardenable aluminum and nickel alloys. Splash cooling, which involves the spraying of the coolant through suitable nozzles onto hot workpieces, is commonly u sed in combination w ith continuous casting and w ith ame hardening. Film cooling, which involves heat transfer by the aid of liquid lms, is used for particular casting processes of nonferrous metals.
