Depends on the part use and materials, but only fifth GIF is quenched according to general practice. Water, brine or oil, if you can't keep the part moving and 'wet', air bubbles cause erratic cooling. The fifth GIF demonstrates an agitated bath, which can alleviate that.
...we'll learn more by wandering than searching...
I do wonder about the quenching of those first couple examples, where they are stacked so close together. There is not much room for the coolant to get between the parts. It would be interesting to know how close the hardness levels among the inner parts vs the outer parts.
In the last couple, there is obviously a significant flow of coolant in the tank, to insure more even cooling, before the parts are even dropped into it.
I also find myself wondering how many heat/cool cycles those chains can endure before failure.
But indeed, some interesting footage.
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