YIELD STRENGTH. The stress at which a material exhibits a specified deviation from proportionality of stress and strain. An offset of 0.2% is used for many metals. Compare with tensile strength.
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STRAIN HARDENING. An increase in hardness and strength caused by plastic deformation at temperatures below the recrystallization range.
SUPERCOOLING. Cooling below the temperature at which an equilibrium phase transformation can take place, without actually obtaining the transformation.
SOLUTION HEAT TREATMENT. Heating an alloy to a suitable temperature, holding at that temperature long enough to cause one or more constituents to […]
SECONDARY HARDNESS. The higher hardness developed by certain alloy steels when they are cooled from a tempering operation. This should always be followed […]