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· Stress relief annealing is
performed above about 500 C to remove stresses
in the material due to fabrication
processes such as drawing
of wires or stamping.
· The
time of annealing is controlled to permit stress relief due to
re-crystallization, but is kept short enough to prevent a reduced yield stress
due to Fe3C
redistribution.
· Annealing
at temperatures just below the eutectoid temperature causes
the morphology of the Fe3C to change from its lamina form to spherical
precipitates. This process of Spheroidisation is illustrated.
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