The Art and Science of Annealing
Couple of relavant quotes from the above articel
"Brass, on the other hand, cannot be made harder by heating it--ever. Brass is always made softer by heating."
"Unlike steel, which will be made harder when it is cooled rapidly, brass is virtually unaffected when it is rapidly cooled. Annealing brass and suddenly quenching it in water will have no measurable effect on the brass"
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