During the T6 heat treatment for the cast 319 aluminum parts the surface darkens and they are inconsistent with each other. We quench the parts in city water and tried several combinations of quench water, increasing/Decresing the hardness, PH level but nothing produced any result.
Do anyone...
I am looking for some information regarding how the water hardness affect it's heat transfer rate. We are using water to quench the heat treated parts and I wanted to know how the hardness will affect the rate of cooling(parts).
