ACICULAR FERRITE. A highly substructed nonequaixed ferrite formed upon continuous cooling by a mixed diffusion and shear mode of transformation that begins at a temperature slightly higher than the transformation temperature range for upper bainite in that it has a limited amount of carbon available; thus, there is only a small amount of carbide present.
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SUPERCOOLING. Cooling below the temperature at which an equilibrium phase transformation can take place, without actually obtaining the transformation.
AGE HARDENING. Hardening by aging, usually after rapid cooling or cold working.
SOAKING. Prolonged holding at a selected temperature to effect homogenization of structure or composition.
TOUGHNESS. The ability of a metal to absorb energy and deform plastically before fracturing.