Quenching

Quenching:

- May be Carried out in water, brine ( saltwater), oils, molten salts, or air as well as other solutions. (Book)

- Severity of quench: because of differences in thermal conductivity, specific heat, and heat of vaporization the cooling rate or "severity of quench" will also be different. (book)

- Cooling capacity from 5-0 : Agitated Brine, 5; still water, 1; still oil, .3; cold gas, .1; still air, .2; (book)

- Agitation is a big factor in the of cooling.

- Cooling rate also depends on the surface to area-to-volume ratio of the part. The higher the ratio the higher the cooling rates.

- Water vapor is a common cooling medium, but metal may for a vapor blanket to form water-vapor bubbles, creates a barrier to heat conduction. Can be helped by agitating the water.

- Brine is effective quenching medium, because salt helps to nucleate bubbles at the interfaces, improving agitation, but it can corrode the part.

- Die quenching: describes the process of clamping the part to be heat treated to a die, which chills selected regions of the part, this way cooling rates and warpage can be controlled. (book)

- The rate of cooling during quenching may not be uniform, particularly with complex