Advanced Course in Heat and Mass Transfer in Metallurgical Systems
Optimal Cooling Rate and Process Control in Metallic Parts Heat Treatment
pages 535-544
ABSTRAKT
A metallurgist proceeding to the quenching of a metallic part for obtaining an alloy with high mechanical properties has to look for a compromise between two opposite necessities :
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- a fast cooling rate is necessary to provide the metastable structure presenting wanted properties
- high temperature gradient are to be avoided not to introduce between the different zones of the parts any dilatation differences responsible, after cooling, of non reversible stresses or deformations.
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- the heat treatment of a wire getting off a rolling will (patenting) which needs a very accurate cooling rate associated with precise surface temperature condition introduced by structural problems.
- the heat treatment of forged aluminium parts which introduces a concept of optimal cooling rate.