The deformation behaviour of a chromium-nickel-molybdenum (Ci-Ni-Mo) s
teel tested in the inter-critical range is studied. It is concluded th
at at the start of deformation, the strain is concentrated in the weak
er phase (ferrite), but as straining progresses, the austenite starts
to contribute to the deformation. This change in behaviour is explaine
d by the appearance of dynamic restoration, the effects of which will
be more acute in the austenite due to recrystallization; that in the f
errite being due to recovery.