engleski

History and Perspective of controllable Heat Extraction during Quenching

The trend in quenching technology is to shift from immersion quenching in liquid media to the high pressure gas quenching. It is expected that this technique will be used not only in vacuum furnaces but also in atmosphere furnaces using a sealed cold wall chamber. This technique, contrary to liquid media, enables Newtonian cooling which is much easier for calculation and simulation than non-Newtonian cooling. The quenching intensity in gas quenching can be substantially increased by temporary adding dispersed liquid nitrogen through a suitable nozzle field. Dispersed liquid nitrogen can be used for individual components quenching in specifically designed facilities, but also in certain batch quenching applications, combined with a pressurized nitrogen volume stream. By changing temporary one or the other of several cooling parameters during the quenching cycle the Controllable Heat Extraction Technology (CHE) is possible. Using adequate control system consisting of an instrumented probe, control devices for every cooling parameter and relevant software program, automatic control of a predetermined quenching process can be realized.

heat treatment; quenching; heat extraction; control

nije evidentirano