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Work hardening is done by repeatedly moving the brass. Hammering it doesn't do that.
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Soft brass has a large grain structure. When brass is hammered, the grains are broken up. Hard brass has small grain structure. Repeated firings and resizing (hammering, bending) results in the hardening of the brass.
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Brass is hardened when it is heated and allowed to cool
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Brass is annealed (softened) when it is heated (to a high enough temperature) to allow the small grains to grow into larger grains. Sudden cooling stops the process.
https://bisonballistics.com/articles...rass-annealing