Quantitative characterisation of substructural development during warm working of an interstitial free steel

A Ti containing interstitial free steel was warm rolled in the temperature range 500-800 degrees C, using wedge shaped slabs to produce a range of str ains in a single rolling test. Some plane strain compression tests, under s imilar conditions, were carried out to obtain accurate stress-strain data. Variations in substructural features including subgrain sizes, subgrain asp ect ratios, and misorientations between subgrains were quantitatively measu red by TEM, Close correlation was observed between mechanical behaviour and variations in the substructure at different temperatures. At the lower tem perature (500 degrees C), the material showed cold worked characteristics, but as the deformation temperature was increased the effects of recovery be came more pronounced, and hot working behaviour was obvious in the flow str ess as well as in the substructural observations at 800 degrees C. MST/4195 .