Abstract
The superiority of gas quenching to liquid quenching in distortion control and environmental protection causes an increased interest in the various gas methods. The heat transfer in gas quenching processes can be directly influenced by the pressure, the velocity, and the kind of gas. Processes based on high velocities can be easily included in continuos heat treatment processes. Various authors investigated the heat transfer distribution caused by the operational parameters of the nozzle field, but none reflects the influence of these parameters or the heat transfer gradients on the properties of the quenched material. Different geometries like cylinders, plates, and ball bearing rings were gas quenched in a variable nozzle field under atmospheric pressure. The influences of nozzle field parameters on the cooling velocity and hardness are summed up in the first part of this paper. The second part contains investigations on distortion and presents the results of numerical simulation of the gas flow in the nozzle field. The results of simulation are compared to experimental results.
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