GAS QUENCHING WITH CONTROLLABLE HEAT EXTRACTION (CROSBI ID 519935)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Liščić, Božidar
engleski
GAS QUENCHING WITH CONTROLLABLE HEAT EXTRACTION
High pressure gas quenching became a modern way of quenching finally machined engineering components, having many advantages compared to quenching in liquid quenchants. The main shortcoming of this technology is the problem of achieving adequate hardness in the core of bigger workpieces, because of inadequate quenching intensity. Due to the possibility to change gas pressure and its flow velocity, combined with transient spraying of liquid nitrogen during the quenching process, the intensity of cooling can be instantly increased during selected time intervals. In this way the heat extraction dynamics can be automatically controlled, and a predetermined path of the heat transfer coefficient can be followed. Preliminary experiments show that using the controllable heat extraction (CHE) technology, the mentioned shortcoming can be eliminated. Theoretical background of the CHE technology is described, with particular attention to the depth of hardening, and to residual stresses. Possibilities and prerequisite conditions for application of the CHE technology in vacuum furnaces, and for automatic heat extraction control, are discussed.
High pressure gas quenching; Heat transfer coefficient; Cooling curve; Hardness distribution; Automatic control
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Podaci o prilogu
153-x.
2006.
objavljeno
Podaci o matičnoj publikaciji
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Vancouver: The Minerals, Metals and Materials Society
Podaci o skupu
THERMEC '2006 - International Conference on Processing and manufacturing of Advanced Materials
predavanje
04.07.2006-08.07.2006
Vancouver, Kanada