The Fundamentals of Metalworking (PDF)

Static and dynamic changes of
structure during hot forming
• Dynamic and static recovery
are strongly encouraged in metals
with high stacking fault energy
(easy for climb and cross slip) such
as aluminium , α –Fe, ferritic
alloys.
• Hot flow curve with a constant or
slightly drop of yield stress are
typical for dynamic recovery.
• On the contrary, the flow curves
with dynamic recrystallisation
(after initial hardening) show a
sudden drop in yield stress.
Schematic form of hot flow curves by
(a) dynamic recovery alone
(b) both dynamic recovery and
recrystallisation.
Suranaree University of Technology Tapany Udomphol
Jan-Mar 2007