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How does recrystallization change a metal during hot working?

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Diagram of a zinc-lead blast furnace system showing ore and coke entering through charge hoppers, with labeled furnace, air preheater, blower, taphole for slag and lead bullion, and a connected lead-splash condenser using rotors to separate and cool lead and zinc, with pathways for molten metals and off-gas. — metallurgy A zinc-lead blast furnace and lead-splash condenser. This technology is utilized mainly for producing zinc while managing both lead and zinc from raw materials, a technique that was highly influential in 20th-century smelting.

During hot working, a metal is deformed at a temperature high enough to trigger recrystallization. This process fundamentally changes the metal's internal structure by consuming the distorted, strain-hardened grains created during deformation and replacing them with a new set of strain-free grains.12

Because these new grains are free of the strain that typically causes work hardening, the metal remains ductile throughout the process. This allows the material to undergo significant compressive plastic strain without reaching the fracture limits associated with cold working. By performing these operations above the recrystallization temperature, manufacturers can effectively shape metals while simultaneously improving their mechanical properties, such as ductility and toughness, by eliminating porosity and refining the grain structure.13